VPN (Virtual Private Network) fast rerouting method and device and provider edge device

A business edge, fast technology, applied in the computer field, can solve the problem of unable to achieve fast convergence of VPN services

Inactive Publication Date: 2013-02-13
RUIJIE NETWORKS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Embodiments of the present invention provide a VPN fast rerouting method, device, and provider edge equipment to solve the problem that the existing VPN fast rerouting method cannot achieve fast convergence of VPN services

Method used

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  • VPN (Virtual Private Network) fast rerouting method and device and provider edge device
  • VPN (Virtual Private Network) fast rerouting method and device and provider edge device
  • VPN (Virtual Private Network) fast rerouting method and device and provider edge device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] This embodiment uses BFD to detect LSPs as a fault detection mechanism for VPN fast rerouting.

[0047] After P1 warm restarts, the LDP module of P1 will delete the LSP and send label withdrawal messages to PE-A and PE-B.

[0048] If the BFD module in PE-A first detects that the BFD session associated with the LSP is terminated, the BGD module will notify the switching unit to switch the active and standby paths, and the switching module will switch the VPN traffic from CE-A→PE-A→P1→PE Switch from the main path -B→CE-B to the backup path of CE-A→PE-A→P2→PE-C→CE-B.

[0049] If the LDP module in PE-A receives the label revocation message first, it will delete the LSP corresponding to the label revocation message, and notify the switching module to switch the active and standby paths, and the switching module will switch the VPN traffic from CE-A→PE-A→ The main path P1→PE-B→CE-B is switched to the backup path of CE-A→PE-A→P2→PE-C→CE-B, and then the LDP module notifies the...

Embodiment 2

[0052] This embodiment uses BFD to detect LSPs as a fault detection mechanism for VPN fast rerouting.

[0053] After PE-B warm restarts, the LDP module of PE-B deletes the LSP, and then sends a label withdrawal message to P1.

[0054] After receiving the label withdrawal message, the LDP module in P1 deletes the LSP corresponding to the label withdrawal message, and then sends the label withdrawal message to PE-A.

[0055] If the BFD module in PE-A first detects that the BFD session associated with the LSP is terminated, the BFD module will directly notify the switching module to switch the VPN traffic from CE-A→PE-A→P1→PE-B→CE-B This primary path is switched to the backup path of CE-A→PE-A→P2→PE-C→CE-B.

[0056] If the LDP module in PE-A receives the label revocation message first, after deleting the LSP corresponding to the label revocation message, it first notifies the switching module to transfer the VPN traffic from CE-A→PE-A→P1→PE-B→CE- Switch the primary path of B to...

Embodiment 3

[0058] This embodiment uses BFD to detect BGP neighbors as a fault detection mechanism for VPN fast rerouting.

[0059] After PE-B warm restarts, the BGP module of PE-B disconnects the TCP connection with PE-A.

[0060] If the BFD module in PE-A first detects that the BFD session associated with PE-B as a BGP neighbor is terminated, it will notify the switching module to directly transfer the VPN traffic from CE-A→PE-A→P1→PE-B→CE-B. switch from the primary path to the backup path of CE-A→PE-A→P2→PE-C→CE-B.

[0061] If the BGP module in PE-A first detects that PE-B is interrupted as a BGP neighbor due to the disconnection of the TCP connection, it first notifies the switching module to transfer the VPN traffic from CE-A→PE-A→P1→PE-B→CE- Switch the primary path of B to the backup path of CE-A→PE-A→P2→PE-C→CE-B, and then notify the BFD module to delete the BFD session associated with PE-B.

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Abstract

The invention discloses a VPN (Virtual Private Network) fast rerouting method and equipment and provider edge (PE) equipment. The VPN fast rerouting method comprises the following steps of: A, in a VPN of the PE equipment doubly attributive to CE (Customer Edge) equipment, receiving a label revoking message sent by network equipment on a main path by the PE equipment with a VPN rapid rerouting function; or, detecting that a BGP (Border Gateway Protocol) neighbor on the main path is broken off because the TCP (Transmission Control Protocol) fails in connection; B, determining whether an LSP (Label Switched Path) corresponding to the label revoking message or a BFD (Bidirectional Forwarding Detection) conversation associated to the BGP neighbor is in a communication state; and C, if so, carrying out main and spare path switching and canceling the BFD conversation. Due to adoption of the scheme, rapid convergence of VPN businesses can be ensured.

Description

technical field [0001] The invention relates to the field of computer technology, in particular to a VPN fast rerouting method, device and provider edge equipment. Background technique [0002] Multiprotocol Label Switching (Multiprotocol Label Switching, MPLS) is a technology that uses labels for high-speed and efficient data forwarding. Multiprotocol means that it can support multiple network layer protocols. Label switching means attaching labels to packets. Forward the message. A virtual private network (Virtual Private Network, VPN) is a private network realized by interconnecting outlets in different places through a public network. [0003] MPLS L3VPN refers to the VPN technology implemented using MPLS technology and used to transmit IP packets. Since IP works on the third layer of the 7-layer network model, it is called MPLS L3VPN. It uses the Border Gateway Protocol (BGP) to advertise VPN routes in the public network, and uses MPLS technology to forward VPN packet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/707H04L12/46H04L45/24
Inventor 戴志滨
Owner RUIJIE NETWORKS CO LTD
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