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Fast re-route method and device in MPLS (Multi-Protocol Label Switching)

A routing and fast technology, applied in the field of network communication, can solve problems such as extended service interruption time and inability to achieve 50mS fast switching, and achieve the effect of saving session resources and saving VN entry resources

Active Publication Date: 2012-07-25
NEW H3C TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, although the switching time of a pair of active and standby LSPs can reach 50mS, in actual networking, the number of active and standby LSPs is large, often reaching more than 1M. If each pair of active and standby LSPs is switched independently at the same time, it cannot be realized. Fast switching at the level of 50mS prolongs service interruption time

Method used

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  • Fast re-route method and device in MPLS (Multi-Protocol Label Switching)
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  • Fast re-route method and device in MPLS (Multi-Protocol Label Switching)

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Embodiment Construction

[0028] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] To implement fast LSP switching, a simple solution is to configure the BFD session mechanism, and each BFD session detects one LSP. However, in actual networking applications, the number of LSPs may reach more than 1M. If the value is too high, the device cannot support a large number of BFD sessions and cannot be applied on a large scale.

[0030] Preferably, the present invention proposes Figure 6 The flow shown:

[0031] in the description Figure 6 Before the flow shown, the application background of the flow is described first:

[0032] Although routing devices in the MPLS network such as figure 1 The shown ROUTE A can generate multiple pairs of active and standby LSPs. However, in practical applications, many pairs of active and ...

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Abstract

The invention provides a fast re-route method and a device in MPLS (Multi-Protocol Label Switching). According to the method and the device provided by the invention, a great amount of main LSPs (Label Switch Paths) with same output interface information multiplex the same VN table item and the same BFD (Bidirectional Forwarding Detection) conversation; the same output interface link of the main LSPs can be detected by the BFD conversation; and the shared VN table item can be updated when the fault of the link is detected, so as to realize the conversion of the main LSPs. The fast re-route property of 50 mS can be entirely satisfied, namely the fast re-route of the LSPs with the same output interface can be realized.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a fast rerouting method and device in Multiprotocol Label Switching (MPLS: Multiprotocol Label Switching). Background technique [0002] In the MPLS technology, when the network changes, it is necessary to shorten the service interruption time in the network as much as possible to meet the real-time processing requirements of the service. In a traditional method, MPLS adopts Label Distribution Protocol (LDP: Label Distribute Protocol) fast rerouting (FRR: Fast Re-Route) technology to shorten service interruption time as much as possible. The main idea of ​​LDP FRR is: the routing device configured with LDP establishes the primary label forwarding path (LSP: Label Switch Path) and the backup LSP used to protect the primary LSP. When the link of the primary LSP is normal, the primary LSP forwards the service. And when a failure of the main LSP is detected, the servic...

Claims

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Application Information

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IPC IPC(8): H04L12/56H04L45/50H04L45/247H04L45/60
Inventor 季福良顾锦枫
Owner NEW H3C TECH CO LTD
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