WO2013013577A1 - Method, device and system for managing bandwidth resource of label switched path - Google Patents

Abstract

Provided in an embodiment of the present invention are a method, device and system for managing the bandwidth resource of a label switched path (LSP), the method mainly comprising: a transit node receives a label distribution protocol (LDP) message carrying a reserved bandwidth value sent by a downstream node; the transit node reserves a downlink bandwidth resource for the downstream node according to the reserved bandwidth value, and sends the LDP message carrying the reserved bandwidth value to an upstream node of the transit node. The embodiment of the present invention provides bandwidth resource assurance for a data flow in the LSP established via a multicast label distribution protocol (MLDP), and provides bandwidth assurance for an IPTV flow sent by a multicast source to pass through the LSP.

Description

 Bandwidth resource management method, device and system for label forwarding path

 The present invention relates to the field of communications technologies, and in particular, to a bandwidth resource management method, apparatus, and system for an LSP (Label Switched Path). Background technique

 With the widespread use of IPTV (Internet Protocol television), P2MP (Point to Multiple Point) is usually used on the Internet Protocol (Multi Protocol Label Switching). Multipoint)/MP2MP (Multipoint to Multiple Point) The LS P carries the multicast stream of the I PTV.

 You can use MLDP (Multicast Label Distribution Protocol) to establish a P2MP/MP2MP LSP. The P2MP/MP2MP LSP established by MLDP is initiated by the leaf node. The P2MP/MP2MP LSP reaches the ingress node (root node) through the transit node (intermediate node) and terminates at the ingress node. At the same time, the leaf node can automatically join the established P2MP/MP2MP LSP.

 In the process of implementing the present invention, the inventors have found that at least the following problems exist in the prior art: P2MP/MP2MP LSP established by MLDP does not have bandwidth resource reservation capability, and all P2MP/MP2MP LSP shared link available bandwidth resources, from group The IPTV traffic from the broadcast source traverses the P2MP/MP2MP LSP and there is no bandwidth resource guarantee. Video quality problems occur when users on the leaf node side receive I PTV traffic because there is no bandwidth guarantee. Summary of the invention

An embodiment of the present invention provides a bandwidth resource management method, apparatus, and system for an LSP, so as to provide bandwidth resource guarantee for a data flow in an LSP established by MLDP. A bandwidth resource management method for a label forwarding path includes:

 The intermediate node receives a label distribution protocol message that is sent by the downstream node and carries a bandwidth reservation value, where the label distribution protocol message is used to establish a label forwarding path from the intermediate node to the downstream node;

 The intermediate node reserves the downlink bandwidth resource according to the bandwidth reservation value, and sends a label distribution protocol message carrying the bandwidth reservation value to the upstream node of the intermediate node.

 A bandwidth resource management device for a label forwarding path is disposed in a leaf node, and the device specifically includes:

 a bandwidth reservation value determining module, configured to acquire a bandwidth reservation value of the leaf node, where the bandwidth reservation value is a value of a downlink bandwidth resource that the intermediate node needs to reserve for the leaf node; a module, configured to send, to the intermediate node, a label distribution protocol message that carries the bandwidth reservation value, where the label distribution protocol message is used to establish a label forwarding path from the intermediate node to the leaf node;

 The notification message processing module is configured to: after receiving the label distribution protocol message that is sent by the intermediate node and that does not have the bandwidth resource mismatch or the bandwidth reservation value mismatch information, resend the label distribution that carries the other bandwidth reservation value to the intermediate node. The protocol message or sends a message to the intermediate node to revoke the establishment of the label forwarding path.

 A bandwidth resource management device for a label forwarding path is disposed in an intermediate node, where the device specifically includes:

 a label distribution protocol message processing module, configured to receive a label distribution protocol message that is sent by the downstream node and that carries a bandwidth reservation value, where the label distribution protocol message is used to establish a label forwarding path from the intermediate node to the downstream node;

The bandwidth resource reservation module is configured to reserve, according to the label distribution protocol, a bandwidth reservation value carried in a label distribution protocol message received by the mask processing module, to reserve a downlink bandwidth resource by the downstream node. A bandwidth resource management device of the label forwarding path is disposed in the root node, and includes: a label distribution protocol message receiving module, configured to receive a label distribution protocol message that is sent by the intermediate node and carries a bandwidth reservation value;

 And a downlink bandwidth resource reservation module, configured to use, according to the bandwidth reservation value, a bandwidth resource reserved by the intermediate node for a row.

 A bandwidth resource management system for a label forwarding path, including:

 a leaf node, the leaf node includes the bandwidth resource management device of the label forwarding path, and an intermediate node, where the intermediate node includes the bandwidth resource management device of the label forwarding path, and receives the carried bandwidth reserved value sent by the leaf node a label distribution protocol, the label distribution protocol message is used to establish a label forwarding path from the intermediate node to the downstream node, and the bandwidth reservation value carried in the received label distribution protocol message is The leaf node reserves the downlink bandwidth resource; and

 a root node, the root node includes the bandwidth resource management device of the label forwarding path, the root node receives a label distribution protocol message sent by the intermediate node, and reserves bandwidth for the intermediate node according to the label distribution protocol message. Resources.

 According to the technical solution provided by the foregoing embodiment of the present invention, the embodiment of the present invention implements the LSP established by the MLDP by using the bandwidth reservation value sent by the leaf node according to the leaf node to reserve the bandwidth resource of the leaf node. The bandwidth resource guarantee is provided for the data flow, and the bandwidth guarantee is provided for the I PT V traffic coming from the multicast source to traverse the LS P. DRAWINGS

 In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be described in detail below. It is obvious that the drawings in the following description are only some embodiments of the present invention. It will be apparent to those skilled in the art that other drawings may be obtained from these drawings without the inventive labor.

FIG. 1 is a leaf node and an intermediate section in an IP/MPLS network according to Embodiment 1 of the present invention; A schematic diagram of an application scenario in which an LSP is set up between the point and the root node through the mLDP.

 FIG. 2 is a schematic diagram of a method for managing a bandwidth resource of an LSP according to Embodiment 1 of the present invention; FIG. 3 is a schematic diagram of a format of a DR-BW TLV according to Embodiment 1 of the present invention; A format diagram of a Label Mapping message carrying a DR-BW TLV;

 FIG. 5 is a schematic diagram of an application scenario of establishing an LSP by using an mLDP between a leaf node, an intermediate node, and a root node in an IP/MP LS network according to Embodiment 2 of the present invention;

 FIG. 6 is a flowchart of a method for managing a bandwidth resource of an LS P according to Embodiment 2 of the present invention; FIG. 7 is an LD P for an intermediate node to send a bandwidth resource mismatch information to a leaf node according to Embodiment 2 of the present invention; a schematic diagram of the notification message;

 8 is a schematic diagram of a format of a BW Status code according to Embodiment 2 of the present invention; FIG. 9 is a P P carrying a BW Status code according to Embodiment 2 of the present invention;

Schematic diagram of the format of the Status TLV;

 FIG. 10 is a specific structural diagram of a bandwidth resource management apparatus 10 for an LSP according to Embodiment 3 of the present invention;

 FIG. 1 is a specific structural diagram of another L S P bandwidth resource management apparatus 1 according to Embodiment 3 of the present invention;

 FIG. 1 is a schematic structural diagram of another bandwidth resource management apparatus 1 for an LSP according to Embodiment 3 of the present invention;

 FIG. 13 is a specific structural diagram of another bandwidth resource management apparatus 1 for an LSP according to Embodiment 3 of the present invention;

 FIG. 14 is a specific structural diagram of a bandwidth resource management apparatus 14 for an LSP according to Embodiment 3 of the present invention;

FIG. 15 is a specific structural diagram of another LSP bandwidth resource management apparatus 1 according to Embodiment 3 of the present invention; FIG. 16 is a schematic diagram of an LSP bandwidth resource management system 16 according to Embodiment 3 of the present invention; Body structure diagram.

detailed description

 The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

 In order to facilitate the understanding of the embodiments of the present invention, several specific embodiments will be described below with reference to the accompanying drawings.

 An application scenario of establishing an LSP through a mLDP between a leaf node, a transit node, and an ingress in an I P/M PLS network is shown in FIG. 1 . In the scenario of FIG. 1, only the case where only one intermediate node is included between the leaf node and the root node is listed. Those skilled in the art can understand that the embodiment can also be applied to include multiple intermediate nodes between the leaf node and the root node. The scene of the node.

 The specific processing flow of the LSP bandwidth resource management method provided in this embodiment is as shown in FIG. 2, and includes:

 The intermediate node receives the LDP message that carries the bandwidth reservation value sent by the leaf node, and the LD P message is used to establish an LS P from the intermediate node to the leaf node.

 For example, the foregoing bandwidth reservation value may be represented by a DR-BW TLV (Downstream Receiver Bandwidth Type-Length-Value, a type length value of the downstream reception bandwidth) as shown in FIG. 3. In FIG. 3, Length represents Value. The length of the part, Value, represents the value of the bandwidth reserved value carried in the DR-BW TLV.

For example, the LDP message may be a Label Mapping message in the LDP protocol. The Label Mapping carrying the DR-BW TLV is provided in this embodiment. The format of the message is shown in Figure 4. In Figure 4, the DR-BW TLV is carried in the optional (optional) field in the Label Mapping message.

 The intermediate node reserves the downlink bandwidth resource according to the bandwidth reservation value, and sends the LDP message carrying the bandwidth reservation value to the upstream root node of the intermediate node.

 Specifically, when the value of the available bandwidth resource of the intermediate node is greater than or equal to the bandwidth reserved value, the intermediate node reserves, for the leaf node, a downlink bandwidth resource whose value is the bandwidth reserved value, And sending, to the upstream node of the intermediate node, an LDP message that carries the bandwidth reservation value; when the available bandwidth resource of the intermediate node is smaller than the bandwidth reservation value, the intermediate node sends the carried to the leaf node. LD P notification message with insufficient bandwidth resource information.

 For example, the intermediate node receives the bandwidth reservation value of the LDP message sent by the leaf node and carries the bandwidth reservation value of 10M. When the available bandwidth resource of the intermediate node is greater than or equal to 10M, the intermediate node reserves the leaf node. A downlink bandwidth resource of 10 M, and a Label Mapping message carrying a bandwidth reserved value of 10 M is sent to the root node. A person skilled in the art may understand that when the intermediate node and the root node further include other intermediate nodes, the intermediate node sends the Label Mapping message to the other intermediate nodes, and the other intermediate nodes further The Label Mapping message is gradually passed to the root node. The root node reserves the egress bandwidth of the local node according to the bandwidth reservation value in the received Label Mapping message, and establishes an LSP. Then, the root node imports the multicast data stream from the multicast source into the LSP in a static or dynamic manner, and sends the multicast data stream to the intermediate node. The intermediate node then sends the multicast data stream to the leaf node. The static mode refers to the command line configuration on the root node to import the multicast data stream into the LSP. The dynamic mode refers to dynamically importing the multicast data stream into the LSP when the IP multicast tree is established.

For example, if the intermediate node receives the bandwidth reservation value of the Label Mapping message sent by the leaf node and the value of the bandwidth reservation is 10 MB, and the available bandwidth resource of the intermediate node is less than 10 M, the intermediate node sends the insufficient bandwidth information to the leaf node. The LDP notification message, the bandwidth resource shortage information may be, for example, carrying a Status code as shown in FIG. MP Status TLV indicates that the Status code value is set to 1. In the BW Status code shown in FIG. 8, the BW Type indicates a type field, and the value of the field can be set to a customized value; the Length field indicates the length of the Status code field; and the value of the Status code field is defined.

1 indicates insufficient bandwidth resources; a value of 2 in the Status code field indicates that the bandwidth reservation values do not match. The embodiment of the present invention also provides an MP Status TLV (Multicast Status Type Length Value) carrying the above Status code as shown in FIG. 9. Further, after receiving the LDP notification message carrying the insufficient bandwidth information, the leaf node selects to send an LDP message carrying the other bandwidth reservation value to the intermediate node according to the local configuration, when the other bandwidth reserved value For a special agreed value, such as 0, the intermediate node will take the best effort to provide the bandwidth resource guarantee to the leaf node; or the leaf node sends a message to the intermediate node to revoke the establishment of the LSP, for example, the message may be For Label Withdraw.

 The bandwidth reservation value sent by the leaf node to the intermediate node in the embodiment 21 can be obtained, for example, by:

 Manner 1: The traffic of the multicast data stream that needs to be distributed to each leaf node received by the root node from the multicast source is statically configured with the bandwidth reserved value on the leaf node, and belongs to each leaf node of the same multicast group. The bandwidth reserved values configured on the same are the same;

 Manner 2: The root node sends an LDP message carrying the same bandwidth reservation value to each leaf node belonging to the same multicast group according to the traffic of the multicast data stream that is received from the multicast source and needs to be distributed to each leaf node. BGP (Border Gateway Protocol) message. In actual applications, the bandwidth reservation value in the LDP message or the BG P message can also be carried by the DR-BW TLV.

 It can be seen from the technical solution provided by the foregoing embodiments of the present invention that, in the embodiment of the present invention, the intermediate node reserves the downlink bandwidth resource according to the bandwidth reservation value sent by the leaf node, thereby implementing the M LD. The established LS 提供 provides bandwidth resource guarantee for the data stream.

The above describes the process of establishing a LSP2ΜΡ LSP. If it is necessary to establish a Ρ2Μ LSP, in addition to establishing the LS Ρ of the above-mentioned root node→intermediate node→leaf node, it is necessary to establish a leaflet. Point → intermediate node → LSP of the root node, that is, a bidirectional LSP needs to be established. The bandwidth resource management method of the LSP provided by the embodiment of the present invention further includes:

 The intermediate node receives the LDP message that is sent by the root node and carries the uplink bandwidth reservation value, and the intermediate node reserves the uplink bandwidth resource according to the uplink bandwidth reservation value, and provides the uplink bandwidth resource to the root node. The leaf node sends an LDP message carrying the uplink bandwidth reservation value.

 For example, in a scenario in which an M P2M P LSP needs to be established, after the root node receives the Label Mapping message sent by the intermediate node and carries the bandwidth reservation value, the root node sends the uplink bandwidth reserved value to the intermediate node. The Labe IM apping message initiates an LSP establishment process from the intermediate node to the root node. After receiving the Label Mapping message sent by the root node and carrying the uplink bandwidth reservation value, the intermediate node reserves the uplink bandwidth resource for the root node, and sends the uplink bandwidth reservation to the downstream leaf node. After the Label Mapping message of the value is received, the leaf node reserves the uplink bandwidth resource for the intermediate node after receiving the Label Mapping message sent by the intermediate node, and completes the leaf node→intermediate node→root The establishment process of the node LSP.

 Specifically, the uplink bandwidth reservation value may also be represented by a DR-BW TLV as shown in FIG. 3, where the LDP message may be a Label Mapping message in the LDP protocol, where the uplink bandwidth reservation is performed. The value may be the same as the bandwidth reservation value that is requested by the leaf node to the intermediate node and the root node, and the root node may obtain the bandwidth reservation from the received Label Mapping message sent by the intermediate node. value. The value of the uplink bandwidth reservation may also be other values according to the service type and the requirement, and details are not described herein again.

Specifically, when the value of the available bandwidth resource of the intermediate node is greater than or equal to the uplink bandwidth reservation value requested by the root node, the intermediate node reserves a value for the root node as the uplink bandwidth reserved value. An uplink bandwidth resource, and sending, to the leaf node, a Label Mapping message carrying the uplink bandwidth reserved value; when the available bandwidth resource of the intermediate node is smaller than When the uplink bandwidth reservation value is described, the intermediate node sends an LDP notification message carrying the bandwidth resource shortage information to the leaf node.

 The leaf node reserves the egress bandwidth of the local node according to the received uplink bandwidth reservation value in the received Labe I M ap p i n g message, and establishes an LSP. Then, the leaf node imports the multicast data stream received from the multicast source into the LS P in a static manner or a dynamic manner, and sends the multicast data stream to the intermediate node, and the intermediate node sends the multicast data stream to the root node. The static mode refers to the command line configuration on the leaf node to import the multicast data stream into the LSP. The dynamic mode refers to dynamically importing the multicast data stream into the LSP when the IP multicast tree is established.

 It can be understood in the art that the process of establishing the LSP of the leaf node→intermediate node→root node is basically the same as the process of establishing the root node→intermediate node→leaf node LS P, and details are not described herein.

 According to the technical solution provided by the foregoing embodiment of the present invention, the embodiment of the present invention implements the LSP established by the MLDP by using the bandwidth reservation value sent by the leaf node according to the leaf node to reserve the bandwidth resource of the leaf node. The bandwidth resource guarantee is provided for the data flow, and the bandwidth guarantee is provided for the I PT V traffic coming from the multicast source to traverse the LS P.

 In the embodiment of the present invention, by establishing a bidirectional LSP, the root node is an intermediate node, and the intermediate node reserves the uplink bandwidth for the leaf sub-node, so that the data flow sent by the leaf node and the intermediate node can be guaranteed.

 Embodiment 2

An application scenario of establishing an LSP through the mLDP between a leaf node, a transit node, and an ingress in another IP/M PLS network provided in this embodiment is shown in FIG. 5 . In the scenario of FIG. 5, the intermediate node is connected to two downstream leaf nodes, respectively, the leaf node 1 and the leaf node 2, and the leaf node 1, the leaf node 2, and the intermediate node and the root node Belong to the same multicast group. Only the case where the number of leaf nodes connected to the intermediate node is two is shown in FIG. 5, and those skilled in the art can understand that this embodiment can also be applied to the case where there are multiple leaf nodes connected to the intermediate node. Those skilled in the art can also It is understood that this embodiment can also be applied to a scenario in which a plurality of intermediate nodes are included between a leaf node and a root node.

 The specific processing flow of the LSP bandwidth resource management method provided in this embodiment is as shown in FIG. 6, and includes:

 61. The intermediate node receives an LDP message that is sent by the leaf node 1 and carries a bandwidth reservation value, where the L D P message is used to establish an L S P from the intermediate node to the leaf node 1 .

 For example, the foregoing bandwidth reservation value may be represented by a DR-BW TLV (Downstream Receiver Bandwidth Type-Length-Value, a type length value of the downstream reception bandwidth) as shown in FIG. 3. In FIG. 3, Length represents Value. The length of the part, Value, represents the value of the bandwidth reserved value carried in the DR-BW TLV.

 The LDP message can be a Label Mapping message in the LDP protocol. The format of a Label Mapping message carrying the DR-BW TLV is shown in Figure 4. The DR-BW TLV is carried in the optional (optional) field in the Label Mapping message.

 62. The intermediate node reserves a downlink bandwidth resource according to the bandwidth reservation value, and sends an LDP message carrying the bandwidth reservation value to the upstream root node of the intermediate node.

 Specifically, when the value of the available bandwidth resource of the intermediate node is greater than or equal to the bandwidth reserved value, the intermediate node reserves, for the leaf node 1, a downlink bandwidth resource whose value is the bandwidth reserved value. When the available bandwidth resource of the intermediate node is smaller than the bandwidth reservation value, the intermediate node sends an LDP notification message carrying the bandwidth resource shortage information to the leaf node 1.

For example, the LDP message may be a Label Mapping message, and the intermediate node receives the bandwidth reservation value carried by the Label Mapping message sent by the leaf node 1 as 1 0M, and the available bandwidth resource of the intermediate node is greater than or equal to 10M. The intermediate node reserves a downlink bandwidth resource of 10 M for the leaf node 1 and sends a bearer bandwidth reserved value of 1 0 M to the root node. Label Mapping message. A person skilled in the art may understand that when the intermediate node and the root node further include other intermediate nodes, the intermediate node sends the Label Mapping message to the other intermediate nodes, and the other intermediate nodes further The Label Mapping message is passed to the root node step by step. The root node reserves the egress bandwidth of the local node according to the bandwidth reservation value in the received Label Mapping message, and establishes an LSP. Then, the root node may forward the multicast data stream received from the multicast source to the LSP in a static manner or a dynamic manner, and then send the multicast data stream to the leaf node 1 by the intermediate node. The static mode refers to the command line configuration on the root node to import the multicast data stream into the LSP. The dynamic mode refers to dynamically importing the multicast data stream into the LSP when the IP multicast tree is established.

 For example, the intermediate node receives the bandwidth reservation value carried by the Label Mapping message sent by the leaf node 1 and carries the bandwidth reservation value of 10M. When the available bandwidth resource of the intermediate node is less than 10M, the intermediate node sends the bandwidth resource to the leaf node 1. For the insufficient information LDP notification message, the bandwidth resource shortage information may be represented by, for example, an MP Status TLV carrying a Status code as shown in FIG. 8, where the BW Status code value is set to 1. Further, after receiving the LD P notification message carrying the bandwidth resource shortage information, the leaf node 1 selects to send an LDP message carrying the other bandwidth reservation value to the intermediate node according to the local configuration. For example, when the other bandwidth reservation value is a special agreed value, such as 0, the intermediate node will provide a bandwidth resource guarantee to the leaf node 1 in a best effort manner; or the leaf node 1 sends the bearer to the intermediate node. The message of the indication information of the LSP is revoked, and the message may be, for example, Label Withdraw.

 The bandwidth reservation value sent by the leaf node 1 to the intermediate node in the present embodiment 61 can be obtained, for example, by:

Manner 1: The traffic of the multicast data stream that needs to be distributed to each leaf node received by the root node from the multicast source is statically configured with the bandwidth reserved value on the leaf node, and belongs to each leaf node of the same multicast group. The bandwidth reserved values configured on the same are the same; Manner 2: The root node uses the extended bandwidth reservation value according to the traffic received from the multicast source to be distributed to the multicast data stream of each leaf node, and extends the LDP message or BGP (Border Gateway Protocol). The message is sent to each leaf node belonging to the same multicast group. In actual applications, the bandwidth reservation value in the LDP message or the BGP message may also be carried by the DR-BW TLV.

 63. The intermediate node receives an L D Ρ message that is sent by the leaf node 2 and carries a bandwidth reservation value, and reserves, according to the bandwidth reservation value, the downlink bandwidth resource of the leaf node 2 .

 Specifically, when the intermediate node receives the LDP message that is sent by the leaf node 2 and carries the bandwidth reservation value, the LDP message may be, for example, a Label Mapping message. Because the intermediate node reserves the downlink bandwidth resources reserved for all the leaf nodes belonging to the same multicast group, the intermediate node determines the bandwidth reservation value sent by the leaf node 2 and sends the bandwidth reservation value to the leaf node 1 Whether the reserved downlink bandwidth resources are consistent, if yes, the intermediate node further reserves the downlink bandwidth resource for the leaf node 2 according to the bandwidth reservation value, and the leaf node 2 successfully joins the multicast group; otherwise The intermediate node sends an LDP notification message carrying the bandwidth resource mismatch information to the leaf node 2. The information that the bandwidth resource does not match may include a downlink bandwidth value that the intermediate node has reserved for other leaf nodes.

 For example, the schematic diagram of the LDP notification message that the intermediate node sends the bandwidth resource mismatch information to the leaf node 2 is shown in FIG. 7. In FIG. 7, the intermediate node sends the Label Mapping message according to the received leaf node 1. , 10M bandwidth resources have been reserved for leaf node 1. When the leaf node 2 sends the Label Mapping message with the reserved bandwidth value of 8M to the intermediate node, the intermediate node returns an LDP notification message carrying the reserved bandwidth value mismatch information to the leaf node 2, and the bandwidth resource mismatch information may be used, for example. Carry the MP Status TLV of the Status code as shown in Figure 8, where the BW Status code value is set to 2.

After receiving the Label Mapping message carrying the bandwidth reservation value sent by the other leaf node (in this embodiment, the leaf node 2) that belongs to the same multicast group as the leaf node 1, the intermediate node is based on the carried After the bandwidth reservation value is reserved for the other leaf nodes, The Label Mapping message carrying the bandwidth reservation value may be sent to the root node, or the Labe IM application message carrying the bandwidth reservation value may not be sent to the root node.

 The root node sends the received multicast data stream to the LSP in a static or dynamic manner, and sends the multicast data stream to the leaf node. The static mode refers to the command line configuration on the root node to import the multicast data stream into the LSP. The dynamic mode refers to dynamically importing the multicast data stream into the LSP when the IP multicast tree is established.

 As can be seen from the technical solution provided by the foregoing embodiment of the present invention, in the embodiment of the present invention, the bandwidth reservation resource is reserved by the intermediate node according to the bandwidth reservation value sent by the leaf node, and the root node is based on the bandwidth sent by the intermediate node. The value is reserved for the intermediate section, and bandwidth resources are reserved. This provides bandwidth guarantee for the data flow in the LSP established through the MLDP, and provides bandwidth guarantee for the I PT V traffic from the multicast source to traverse the LS P.

 The above describes the process of establishing a P2MP LSP. If it is necessary to establish an M P2M P LSP, in addition to establishing the LS P of the root node → intermediate node → leaf node, it is also necessary to establish an LSP of a leaf node → an intermediate node → a root node, that is, A two-way LSP needs to be established. For the scenario in which the MPLS P LSP needs to be established, the LSP bandwidth resource management method provided by the embodiment of the present invention further includes:

 64. Receive an LDP message that is sent by the root node and that carries an uplink bandwidth reservation value, and reserve, according to the uplink bandwidth reservation value, the uplink bandwidth resource.

In the embodiment 62, when the intermediate node carries the bandwidth reservation value carried in the LDP message sent by the leaf node 1, the leaf node 1 reserves the downlink bandwidth resource successfully, and then sends the downlink node resource to the intermediate node. The upstream root node sends an LDP message carrying the bandwidth reserved value. After receiving the LDP message carrying the bandwidth reservation value, the root node triggers the establishment process of the LSP of the leaf node→the intermediate node→the root node, and sends an LDP message carrying the uplink bandwidth reservation value to the intermediate node. For example, the value of the uplink bandwidth reservation value BWup carried in the LDP message sent by the root node to the intermediate node is between 62 and the bandwidth pre- carried in the LDP message sent by the intermediate node to the root node. Between 1 /N and N times the value of B Wd w, that is, B Wd w/N BWup < BWdw - N , where N is the number of leaf nodes. In this embodiment, a typical application is Ν=1, that is, the uplink bandwidth reserved value carried in the LDP message sent by the root node to the intermediate node is equal to 62, and the intermediate node is to the root node. The bandwidth reserved value carried in the LDP message sent. Or N^†子数, this case is equivalent to the upstream bandwidth reserved value carried in the LDP message sent by the root node to the intermediate node, and the intermediate node reserves the bandwidth reserved for all leaf nodes belonging to the same multicast group. The sum of resources is the sum of all downstream bandwidth resources.

 Specifically, the uplink bandwidth reservation value that the root node requests from the intermediate node may also be represented by the DR-BW TLV as shown in FIG. 3, and the LDP message used may be Label Mapping in the LDP protocol. Mapping) messages, which are not described here.

 Specifically, when the value of the available bandwidth resource of the intermediate node is greater than or equal to the uplink bandwidth reservation value carried in the LDP message sent by the root node, the intermediate node reserves the value for the root node as the The uplink bandwidth resource of the uplink bandwidth reservation value, and sends an LDP message carrying the uplink bandwidth reservation value to the leaf node 1 and the leaf node 2. Here, the uplink bandwidth reserved value carried in the LDP message sent by the intermediate node to the leaf node 1 and the bandwidth pre-loaded in the LDP message sent by the leaf node 1 received by the intermediate node in the step 61 in this embodiment The value of the LDP message carried in the LDP message sent by the intermediate node to the leaf node 2 is carried in the LDP message sent by the leaf node 2 received by the intermediate node in step 63 of this embodiment. The bandwidth reservation value is the same. When the available bandwidth resource of the intermediate node is smaller than the uplink bandwidth reservation value, the intermediate node sends an LDP notification message carrying the bandwidth resource shortage information to the root node. The LDP notification message that the intermediate node sends the information about the insufficient bandwidth information to the root node is the same as that in the foregoing steps, and details are not described herein again.

65. The intermediate node sends an LDP message carrying a bandwidth reserved value to the leaf node 1 and the leaf node 2. After the intermediate node reserves the uplink bandwidth resource for the root node, the LDP message carrying the bandwidth reservation value is sent to the leaf node 1 and the leaf node 2, and the LDP message may be, for example, Label Mapping. Message. Here, the intermediate node is The uplink bandwidth reservation value carried in the LDP message sent by the leaf node 1 is the same as the bandwidth reservation value carried in the LDP message sent by the leaf node 1 received by the intermediate node in the step 61 in the embodiment. The uplink bandwidth reservation value carried in the LDP message sent by the node to the leaf node 2 is the same as the bandwidth reservation value carried in the LDP message sent by the leaf node 2 received by the intermediate node in step 63 of this embodiment.

 After receiving the Label Mapping message sent by the leaf node and carrying the uplink bandwidth reservation value, the leaf node 1 and the leaf node 2 reserve the egress bandwidth of the node according to the uplink bandwidth reservation value in the Label Mapping message, and establish an LSP. . Then, the leaf node 1 and the leaf node 2 import the multicast data stream received from the multicast source into the LSP in a static manner or a dynamic manner, and send the LSP to the intermediate node, and the intermediate node sends the multicast data stream to the node. The static mode refers to the command line configuration on the leaf node to import the multicast data stream into the LSP. The dynamic mode refers to dynamically importing the multicast data stream into the LSP when the IP multicast tree is established.

 It can be understood in the art that the process of establishing the LSP of the leaf node→intermediate node→root node is basically the same as the process of establishing the root node→intermediate node→leaf node LS P, and details are not described herein.

 Embodiment 3

 The embodiment provides an LSP bandwidth resource management device 10, and the device is disposed in a leaf node, and the specific structure thereof is as shown in FIG. 10. The device 10 includes:

 The bandwidth reservation value determining module 1 01 is configured to obtain a bandwidth reservation value of the leaf node, where the bandwidth reservation value is a value of a downlink bandwidth resource reserved by the intermediate node to the leaf node.

The manner in which the leaf node obtains the foregoing bandwidth reservation value includes, but is not limited to, the following two types: Mode 1: The traffic of the multicast data stream that needs to be distributed to each leaf node from the multicast source received by the root node is in the leaf node. The bandwidth reservation value is statically configured, and the bandwidth reservation values configured on each leaf node belonging to the same multicast group are the same; Mode 2: The root node sends an LDP message or a BGP message carrying the same bandwidth reservation value to each leaf node belonging to the same multicast group according to the received traffic of the multicast data stream that needs to be distributed to each leaf node. In actual applications, the bandwidth reservation value in the LDP message or the BGP message may also be carried by the DR-BW TLV.

 The bandwidth reservation value sending module 102 is configured to send an LDP message carrying the bandwidth reservation value to the intermediate node, where the LDP message is used to establish an LSP from the intermediate node to the leaf node.

 Exemplarily, the foregoing bandwidth reservation value may be represented by a DR-BW TLV (Downstream Receiver Bandwidth Type-Length-Value, a type length value of a downstream reception bandwidth) as shown in FIG. 3. In FIG. The length of the part, Value, represents the value of the bandwidth reserved value carried in the DR-BW TLV.

 The LDP message can be a Label Mapping message in the LDP protocol. The format of a Label Mapping message carrying the DR-BW TLV is shown in Figure 4. In Figure 4, the above DR-BW TLV is carried in the optional (optional) field in the Label Mapping message.

 For example, the bandwidth resource management apparatus 10 of the LSP may further include: a notification message processing module 103, configured to receive an LDP message that is sent by the intermediate node and that carries insufficient bandwidth resources or bandwidth reservation value mismatch information. Afterwards, the LDP message carrying the other bandwidth reservation value is resent to the intermediate node. When the other bandwidth reservation value is a special agreed value, such as 0, the intermediate node will take the best effort to provide the leaf node. The bandwidth resource is guaranteed; or sending the cancellation of the LSP to the intermediate node.

 For example, the bandwidth resource management apparatus 10 of the LSP may further include: an uplink bandwidth reservation module 104, configured to receive the label mapping message that carries the uplink bandwidth reservation value sent by the intermediate node, and then reserve The value is the upstream bandwidth resource reserved for the uplink bandwidth.

When the established LSP is a multi-point to multi-point LSP (MP2M P LSP), since there are two-way LSPs in the M P2M P LSP, it is necessary to establish the root node → intermediate node → leaf node LSP and leaf. The LSP of the child node→intermediate node→root node, in addition to receiving the downlink data stream, each leaf node also sends an uplink data stream to the intermediate node. After receiving the label mapping message that is sent by the intermediate node and carrying the uplink bandwidth reservation value, the uplink bandwidth reservation module 104 reserves an uplink bandwidth resource whose value is the uplink bandwidth reserved value.

 A person skilled in the art may understand that the bandwidth resource management apparatus 10 of the LSP may include only the bandwidth reservation value determining module 101 and the bandwidth reservation value sending module 102, and may also include the bandwidth reserved value determining module 101. And the bandwidth reservation value sending module 102 further includes the foregoing notification message processing module 103 and the uplink bandwidth reservation module 104, or based on the bandwidth reservation value determining module 101 and the bandwidth reservation value sending module 102. Further, any one of the above notification message processing module 103 and uplink bandwidth reservation module 104 is included.

 The embodiment further provides an LSP bandwidth resource management device 11 , which is disposed in the intermediate node, and has a specific structure as shown in FIG.

 The L D P message processing module 111 is configured to receive an LDP message that is sent by the downstream node and that carries a bandwidth reservation value, where the LDP message is used to establish an LSP from the intermediate node to the downstream node.

 The bandwidth resource reservation module 112 is configured to reserve, according to the bandwidth reservation value carried in the LDP message received by the L D P message processing module 111, the downstream node to reserve downlink bandwidth resources.

 For example, as shown in FIG. 12, the bandwidth resource reservation module 112 in the bandwidth resource management apparatus 11 of the LSP may include:

 The available resource processing module 1121 is configured to determine whether the value of the available bandwidth resource of the intermediate node is greater than or equal to the bandwidth reserved value carried in the LDP message received by the LDP message processing module 111, and if yes, to the downstream The node reserves a downlink bandwidth resource whose value is the bandwidth reserved value; otherwise, sends a bandwidth resource shortage message to the LDP notification message sending module 1122.

The LDP notification message sending module 1122 is configured to: when receiving the bandwidth resource shortage message, send an LDP notification message carrying the bandwidth resource shortage information to the downstream node. The above bandwidth resources are not The foot information can be represented by the MP Status TLV carrying the above BW Status code (value 1) as described in the first embodiment.

 For example, as shown in FIG. 13, the bandwidth resource reservation module 112 may further include: a resource matching processing module 1123, configured to determine, in the LDP message received by the LD P message processing module 111 Whether the carried bandwidth reservation value is consistent with the downlink bandwidth resource that the intermediate node has reserved for the other downstream nodes, and if yes, according to the bandwidth reservation carried in the LDP message received by the LDP message processing module 112 The value of the downstream node is reserved for the downlink bandwidth resource; otherwise, the LDP notification message sending module 1 1 22 sends a bandwidth resource mismatch message.

 The L D P notification message sending module 1 1 23 is further configured to: when receiving the bandwidth resource mismatch message, send an LDP notification message carrying the bandwidth resource mismatch information to the downstream node. The foregoing bandwidth resource mismatch information may be represented by an MP Status TLV carrying the foregoing Status code (value 2) as described in Embodiment 1.

 For example, the bandwidth resource management apparatus 1 of the LSP may further include: a downlink bandwidth reservation value sending module 1 13, configured to send an LDP message carrying the bandwidth reservation value to an upstream node of the intermediate node. . When an intermediate node is included between the leaf node and the root node, the upstream node is a root node. It will be understood by those skilled in the art that when the intermediate node and the root node further include other intermediate nodes, the intermediate node will send the LDP message to the other intermediate nodes, and the other intermediate nodes will further The LDP message is gradually passed to the root node.

When the intermediate node has multiple branches, or one intermediate node is connected with multiple leaf nodes, the bandwidth resource reservation module 12 provides the first downstream node of each downstream node belonging to the same multicast group. After the bandwidth resource is reserved, the downlink bandwidth reservation value sending module 112 sends an LDP message carrying the bandwidth reservation value to the upstream node of the intermediate node, where the intermediate node belongs to the same multicast group. After the subsequent downstream nodes of the other downstream nodes reserve bandwidth resources, the LDP message is not sent to the upstream node of the intermediate node; Or, after the bandwidth resource reservation module 112 reserves the downlink bandwidth resource with the value of the bandwidth reservation value for each downstream node that belongs to the same multicast group, the downlink bandwidth reserved value is sent. The module 1 13 sends an LDP message carrying the bandwidth reservation value to the upstream node of the intermediate node, respectively.

 When the LSP is a multi-point to multi-point LSP (M P2M P LSP ), the LDP message processing module 112 may also be configured to receive an LDP message that is sent by an upstream node and that carries an uplink bandwidth reservation value, where the LDP message is carried. The LDP message of the uplink bandwidth reserved value is used to establish an LSP from the intermediate node to the upstream node.

 For example, the bandwidth resource reservation module 112 may further include:

 The uplink bandwidth resource reservation module 1 1 24 is configured to: when the LDP message processing module 112 receives the LDP message that is sent by the upstream node and carries the uplink bandwidth reservation value, according to the uplink bandwidth reservation value, The upstream section reserves the upstream bandwidth resources.

 The uplink bandwidth reservation value sending module 1 1 4 is configured to use the uplink bandwidth resource reservation module 1 1 24 to reserve the uplink bandwidth resource according to the uplink bandwidth reservation value, and then belong to the same group. Each downstream node of the broadcast group sends an LDP message carrying an uplink bandwidth reservation value. For example, the uplink bandwidth reservation value carried by the LDP message sent by the upstream bandwidth reservation value sending module 112 to each downstream node that belongs to the same multicast group may be the LDP message processing module 1 1 1 The uplink bandwidth reservation value carried in the LDP message sent by the upstream node may be other uplink bandwidth reservation values configured according to different service types and network topology scenarios.

 The embodiment further provides an LSP bandwidth resource management device 1 . The device is set in the root node, and the specific structure is as shown in FIG.

 The L D P message receiving module 1 41 is configured to receive an LDP message that carries the bandwidth reserved value sent by the intermediate node;

 The downlink bandwidth resource reservation module 1 42 is configured to reserve a downlink bandwidth resource by the intermediate node according to the bandwidth reservation value.

As shown in FIG. 15, the device 14 may further include: The uplink bandwidth reservation value sending module 143 is configured to send, to the intermediate node, an LDP message that carries an uplink bandwidth reservation value.

 For example, the value of the uplink bandwidth reservation value BW up carried in the LDP message sent by the uplink bandwidth reservation value sending module 143 to the intermediate node is carried in the LDP message sent by the intermediate node to the root node. The bandwidth reserved value is between 1 / N of B Wd w and N times of B Wd w , that is, BWdw / ISK BWup BWdw . N , where N is the number of leaf nodes.

 It can be understood by those skilled in the art that the specific process of the bandwidth resource reservation by using the device in the foregoing embodiment of the present invention corresponds to the foregoing method embodiment, and details are not described herein again.

 This embodiment also provides an LSP bandwidth resource management system 16 . The specific structure is shown in FIG. 16 , and includes:

 a leaf node 1 61, which includes a bandwidth resource management device 10 of the LSP, configured to acquire a bandwidth reservation value of the leaf node, where the bandwidth reservation value is a downlink that the intermediate node needs to reserve for the leaf node. The value of the bandwidth resource; the LDP message carrying the bandwidth reservation value is sent to the intermediate node, and the LDP message is used to establish an LSP from the intermediate node to the leaf node.

 The intermediate node 1 62, which includes the bandwidth resource management device 1 1 of the LSP, is configured to receive an LDP message that is sent by the leaf node and carries a bandwidth reservation value, and the bandwidth reservation value carried in the LDP message is The leaf node reserves the downlink bandwidth resource, and sends an LDP message carrying the bandwidth reservation value to the root node, where the LDP message is used to establish an LSP from the intermediate node to the root node.

 a root node 1 63, which includes a bandwidth resource management device 14 of the LSP, configured to receive an LDP message carrying a bandwidth reservation value sent by the intermediate node 162, and according to the bandwidth reservation value, the intermediate node is pre- Leave the bandwidth resources of the row.

It can be understood by those skilled in the art that the bandwidth resource management system 16 of the LSP provided by this embodiment is the bandwidth resource management method corresponding to the method LSP in the embodiment 1-3 and the bandwidth of the LSP of the bandwidth resource management device of the LSP. The resource management system, the bandwidth resource management device of the LSP included therein includes all the functions of the bandwidth resource management device of the LS P in Embodiment 3, and includes The method of performing the bandwidth resource management of the LSP between the leaf node 1 61, the intermediate node 1 62, and the root node 1 63 corresponds to the bandwidth resource management method of the LSP in the embodiments 1 and 2, and details are not described herein again. In summary, in the embodiment of the present invention, the intermediate node reserves the bandwidth resource according to the bandwidth reservation value sent by the leaf node according to the leaf node, and the root node reserves the bandwidth according to the bandwidth reservation value sent by the intermediate node. The resources are used to provide bandwidth guarantee for the data stream in the LSP established by the MLDP, and the bandwidth guarantee is provided for the I PTV traffic coming from the multicast source to traverse the LS P.

 In the embodiment of the present invention, by establishing a bidirectional LSP, the root node is an intermediate node, and the intermediate node reserves the uplink bandwidth for the leaf sub-node, so that the data flow sent by the leaf node and the intermediate node can be guaranteed.

 The embodiment of the present invention can implement that the intermediate node reserves the same bandwidth resource for each leaf node that belongs to the same multicast source.

 The embodiments of the present invention may reserve corresponding uplink and downlink bandwidth resources for the leaf node and the intermediate node for the P2MP LSP and the MP2M P LSP respectively.

 A person skilled in the art can understand that all or part of the process of implementing the above embodiment method can be completed by a computer program to instruct related hardware, and the program can be stored in a computer readable storage medium. In execution, the flow of an embodiment of the methods as described above may be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), or a random access memory (RAM).

 The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of changes or within the technical scope disclosed by the present invention. Alternatives are intended to be covered by the scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

Claim A bandwidth resource management method for a label forwarding path, comprising: receiving, by an intermediate node, a label distribution protocol message that is sent by a downstream node and carrying a bandwidth reservation value, where the label distribution protocol message is used to establish a label forwarding path from the intermediate node to the downstream node;  The intermediate node reserves the downlink bandwidth resource according to the bandwidth reservation value, and sends a label distribution protocol message carrying the bandwidth reservation value to the upstream node of the intermediate node.  The bandwidth resource management method of the label forwarding path according to claim 1, wherein the intermediate node reserves the downlink bandwidth resource according to the bandwidth resource reservation value, including:  When the value of the available bandwidth resource of the intermediate node is greater than or equal to the bandwidth reservation value, the intermediate node reserves, for the downstream node, a downlink bandwidth resource whose value is the bandwidth reserved value; When the available bandwidth resource of the intermediate node is smaller than the bandwidth reservation value, the intermediate node sends a label distribution protocol notification message carrying the bandwidth resource shortage information to the downstream node.  The bandwidth resource management method of the label forwarding path according to claim 1, wherein the intermediate node reserves the downlink bandwidth resource according to the bandwidth resource reservation value, including: Before the intermediate node receives the label distribution protocol message, the downstream node has reserved downlink bandwidth resources with other downstream nodes that belong to the same multicast group, and the intermediate node determines the bandwidth reserved value. Whether the downlink bandwidth resources reserved for the other downstream nodes are consistent, and if yes, the intermediate node reserves downlink bandwidth resources according to the bandwidth reservation value; otherwise, the intermediate node The downstream node sends a label distribution protocol notification message carrying bandwidth resource mismatch information. The method for managing a bandwidth resource of a label forwarding path according to claim 2, wherein the method further comprises:  After receiving the label distribution protocol notification message carrying the bandwidth resource shortage information, the downstream node resends the label distribution protocol message carrying the other bandwidth reservation value to the intermediate node or sends the revocation establishment to the intermediate node. The message of the label forwarding path.  The method for managing a bandwidth resource of a label forwarding path according to claim 4, wherein the sending, by the upstream node of the intermediate node, a label distribution protocol message carrying the bandwidth reservation value, includes:  After the downstream node reserves the downlink bandwidth resource for the downstream node that sends the label distribution protocol message to the first one of the downstream nodes that belong to the same multicast source, the intermediate node sends the bandwidth to the upstream node of the intermediate node. Reserved value label distribution protocol elimination;  After the downlink node reserves the downlink bandwidth resource for the subsequent downstream node in each of the downstream nodes that belong to the same multicast source, the intermediate node sends or does not send the bandwidth reservation value to the upstream node of the intermediate node. Label distribution protocol message.  The bandwidth resource management method of the label forwarding path according to any one of claims 1 to 5, wherein the method further comprises:  After receiving the label distribution protocol message that is sent by the upstream node of the intermediate node and carrying the uplink bandwidth reservation value, the intermediate node reserves the uplink bandwidth resource according to the uplink bandwidth reservation value.  The bandwidth resource management method of the label forwarding path according to claim 6, wherein the value of the uplink bandwidth reserved value BW up carried in the label distribution protocol message sent by the upstream node of the intermediate node is different from Between 1/N and N times the bandwidth reserved value BWdw carried in the label distribution protocol message sent by the intermediate node to the upstream node of the intermediate node, that is, BWdw/N < BWup < BWdw · N , where N is The number of leaf nodes. The method for managing a bandwidth resource of a label forwarding path according to claim 7, wherein the method further comprises: The intermediate node further sends a label distribution protocol that carries the uplink bandwidth reservation value to each downstream node that belongs to the same multicast group, so that the downstream node, * the reserved value is the label sent by the intermediate node. The upstream bandwidth resource of the upstream bandwidth reserved value carried in the protocol message.  A bandwidth resource management device for a label forwarding path, which is provided in a leaf node, and the device specifically includes:  a bandwidth reservation value determining module, configured to acquire a bandwidth reservation value of the leaf node, where the bandwidth reservation value is a value of a downlink bandwidth resource that the intermediate node needs to reserve for the leaf node; a module, configured to send, to the intermediate node, a label distribution protocol message that carries the bandwidth reservation value, where the label distribution protocol message is used to establish a label forwarding path from the intermediate node to the leaf node;  The notification message processing module is configured to: after receiving the label distribution protocol message that is sent by the intermediate node and that does not have the bandwidth resource mismatch or the bandwidth reservation value mismatch information, resend the label distribution that carries the other bandwidth reservation value to the intermediate node. The protocol message or sends a message to the intermediate node to revoke the establishment of the label forwarding path.  A bandwidth resource management device for a label forwarding path, which is provided in an intermediate node, where the device specifically includes:  a label distribution protocol message processing module, configured to receive a label distribution protocol message that is sent by the downstream node and that carries a bandwidth reservation value, where the label distribution protocol message is used to establish a label forwarding path from the intermediate node to the downstream node;  The bandwidth resource reservation module is configured to reserve a downlink bandwidth resource by the downstream node according to the label distribution protocol: the bandwidth reservation value carried in the label distribution protocol message received by the mask processing module.  The bandwidth resource management device of the label forwarding path according to claim 10, wherein the bandwidth resource reservation module comprises: An available resource processing module, configured to determine whether a value of the available bandwidth resource of the intermediate node is greater than or equal to a label distribution protocol received by the label distribution protocol message processing module The bandwidth reserved value carried in the information, if yes, the downstream node reserves a downlink bandwidth resource whose value is the bandwidth reserved value; otherwise, sends a bandwidth resource shortage message to the label distribution protocol notification message sending module;  The label distribution protocol notification message sending module is configured to: when receiving the bandwidth resource shortage message, send a label distribution protocol notification message carrying the bandwidth resource shortage information to the downstream node.  The bandwidth resource management device of the label forwarding path according to claim 1 , wherein the bandwidth resource reservation module further comprises:  a resource matching processing module, configured to determine whether a bandwidth reservation value carried in the label distribution protocol message received by the label distribution protocol message processing module is consistent with a downlink bandwidth resource that the intermediate node has reserved for other downstream nodes, If yes, the bandwidth reservation value carried in the label distribution protocol message received by the label distribution protocol message processing module is reserved by the downstream node for the downlink bandwidth resource; otherwise, the label distribution protocol notification message sending module sends the bandwidth. Resource mismatch message;  The label distribution protocol notification message sending module is further configured to: when receiving the bandwidth resource mismatch message, send a label distribution protocol notification message carrying the bandwidth resource mismatch information to the downstream node.  The device of the bandwidth resource management device of the label forwarding path according to claim 1 or 2, wherein the device further comprises:  a downlink bandwidth reservation value reporting module, configured to send, to an upstream node of the intermediate node, a label distribution protocol that carries the bandwidth reservation value;  The bandwidth resource reservation module further includes: An uplink bandwidth resource reservation module, configured to: when the label distribution protocol message processing module receives the label distribution protocol message that is sent by the upstream node and carries the uplink bandwidth reservation value, the uplink bandwidth reservation value is the upstream node Reserve upstream bandwidth resources; And an uplink bandwidth reservation value sending module, configured to: the uplink bandwidth resource reservation module, according to the uplink bandwidth reservation value, after the upstream node reserves the uplink bandwidth resource successfully, to each downstream belonging to the same multicast group The node sends a label distribution protocol that carries the upstream bandwidth reservation value: i Xiao, 3⁄4.  A bandwidth resource management device for a label forwarding path, which is characterized in that it is set in a root node, and includes:  a label distribution protocol message receiving module, configured to receive a label distribution protocol message that is sent by the intermediate node and carries a bandwidth reservation value;  And a downlink bandwidth resource reservation module, configured to use, according to the bandwidth reservation value, a bandwidth resource reserved by the intermediate node for a row.  The bandwidth resource management device of the label forwarding path according to claim 14, wherein the device further comprises:  And an uplink bandwidth resource notification module, configured to: when the label forwarding path is a multi-point to multi-point label forwarding path, send, to the intermediate node, a label distribution protocol message that carries a specified bandwidth reservation value, where the specified bandwidth reservation The value is the bandwidth reserved value multiplied by the set multiple.  A bandwidth resource management system for a label forwarding path, comprising: a leaf node, the leaf node comprising the bandwidth resource management device of the label forwarding path according to claim 9;  An intermediate node, the intermediate node, comprising the bandwidth resource management device of the label forwarding path according to any one of claims 1 to 3, receiving a label distribution protocol message that is sent by the leaf node and carrying a bandwidth reservation value, where The label distribution protocol message is used to establish a label forwarding path from the intermediate node to the downstream node, and reserve a downlink bandwidth resource according to the bandwidth reservation value carried in the received label distribution protocol message; with  a root node, the root node including the bandwidth resource management device of the label forwarding path according to claim 14 or 15, wherein the root node receives the label distribution protocol sent by the intermediate node, and according to the label distribution protocol The message reserves bandwidth resources for the intermediate node.