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Method and label switched router (LSR) for initiating label distribution protocol (LDP) session connection establishment

A label forwarding and router technology, applied in network interconnection, data exchange through path configuration, electrical components, etc., can solve problems such as LDP session deadlock, address family inconsistency, and failure to initiate LDP session connection normally, to achieve a solution process The effect of deadlock

Active Publication Date: 2015-07-08
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, one of the LSRs selects the IPV4 address family to request to establish a TCP connection, while the other corresponding LSR selects the IPV6 address family to establish a TCP connection. The address families of the two are inconsistent, which will inevitably cause the failure of the LDP session establishment.
[0004] However, the current dual-stack network scenario adopts a strategy that does not allow switching between address families, that is, the LSR will always try to establish a TCP connection through the address family it chooses without changing, resulting in a deadlock of the LDP session, that is, The problem that the LDP session connection cannot be initiated normally due to the inconsistency of the address family

Method used

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  • Method and label switched router (LSR) for initiating label distribution protocol (LDP) session connection establishment
  • Method and label switched router (LSR) for initiating label distribution protocol (LDP) session connection establishment
  • Method and label switched router (LSR) for initiating label distribution protocol (LDP) session connection establishment

Examples

Experimental program
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Embodiment 1

[0028] figure 1 A schematic flow chart of Embodiment 1 of the method for initiating LDP session establishment in the present invention, as shown in figure 1 As shown, the method may include the following steps:

[0029] Step 101, using the address of the local device belonging to the first transmission address family as the connection establishment address of the local device, and starting the LDP session establishment process for the local device and the peer device according to the connection establishment address of the local device;

[0030] For example, the local device may be a router with a dual-stack protocol, which has two addresses, an IPV4 address and an IPV6 address, and may select an address of the first transmission address family such as an IPV4 address family to start a session establishment process, and the peer device may also Can be a router. For example, it may act as an active party to send an LDP session establishment request to the peer device, or, as ...

Embodiment 2

[0048] figure 2 A schematic diagram of signaling in Embodiment 2 of the method for initiating LDP session establishment in the present invention, as shown in figure 2 As shown, the method of this embodiment takes the establishment of an LDP session under the dual-stack network as an example, and the setting method of the random time value is to use a random value timer as an example, which may include the following steps:

[0049] Step 201, the local device and the peer device send IPV4 / IPV6 LDP Hello messages to each other.

[0050] Wherein, in this embodiment, both the local device and the peer device may be label forwarding routers (LSRs), and the local device is a dual-stack device. The local device can send LDP Hello messages in the IPv4 address family or send LDP Hello messages in the IPv6 address family to discover neighbors that can establish LDP sessions.

[0051] Step 202, the local device receives the LDP Hello message sent by the peer device, determines the add...

Embodiment 3

[0073] image 3 A schematic diagram of signaling in Embodiment 3 of the method for initiating LDP session establishment in the present invention, as shown in image 3 As shown, the method of this embodiment takes the establishment of an LDP session under the dual-stack network as an example, and the setting method of the random time value is to use a random value timer as an example, which may include the following steps:

[0074] Step 301, the local device and the peer device send LDP Hello messages of IPV4 / IPV6 to each other;

[0075] Wherein, in this embodiment, both the local device and the peer device can be label forwarding routers (LSRs); The address family sends LDP Hello messages to discover neighbors that can establish LDP sessions.

[0076] Step 302, the local device receives the LDP Hello message sent by the peer device, determines the address to be used to establish a session connection, and determines that the local device should be used as the passive party; ...

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Abstract

Embodiments of the present invention provide a method and a label forwarding router for initiating an LDP session connection. The method includes: using an address of a first transport address family of a local device as a connection address, and starting an LDP session setup procedure for the local device and a peer device according to the address; setting a random time value in the procedure; determining that current time reaches the random time value and that the LDP session setup fails; and selecting an address of a second transport address family as a new connection address, and starting a new LDP session setup procedure according to the new address. The present invention can implement normal initiation of an LDP session connection.

Description

technical field [0001] The embodiment of the present invention relates to communication technology, in particular to a method for initiating LDP session establishment and a label forwarding router. Background technique [0002] In a Multi Protocol Label Switching (MPLS for short) network, different Label Switched Routers (LSR for short) need to establish a Label Distribution Protocol (LDP for short) session to Messages such as label mapping and release are exchanged to establish a label switching path (Label Switching Path, LSP for short) between different LSRs. Wherein, the LDP message is transmitted by establishing a TCP connection between the two LSRs. [0003] In the network application of prior art, the next generation Internet protocol (Internet Protocol Version 6, referred to as: IPV6) has begun to gradually replace the current IPV4 protocol due to its advantages such as larger space addresses; however, IPV6 still needs continuous development and Perfect, in practic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/46H04L45/50
CPCH04L41/0654H04L45/507H04L47/825
Inventor 李洪亮蒋玲
Owner HUAWEI TECH CO LTD
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