BFD (Bidirectional Forwarding Detection) method and equipment based on LSP (Label Switching Path)

Abstract

The invention discloses a BFD (Bidirectional Forwarding Detection) method and equipment based on an LSP (Label Switching Path). The BFD method comprises the steps that: driving end equipment determines an optimal transmission path; the driving end equipment sends an LSP ping message to driven end equipment, and the LSP ping message carries with information of the optimal transmission path; after the driven end equipment receives the LSP ping message, a selected transmission path is determined by using the information of the optimal transmission path; and when the driving end equipment carries out BFD detection on the LSP, the driven end equipment sends a BFD message to the driving end equipment through the selected transmission path. According to the BFD method and equipment based on the LSP, provided by the invention, a main LSP and a secondary LSP can be accurately detected that whether a fault exists or not; or the condition that whether each LSP in an equivalent LSP has a fault or not is accurately detected.

Description

technical field [0001] The present invention relates to the field of communication technology, in particular to a BFD (Bidirectional Forwarding Detection, Bidirectional Forwarding Detection) detection method and equipment based on LSP (Label Switched Path, Label Switched Path). Background technique [0002] In an MPLS (Multi-Protocol Label Switching, Multi-Protocol Label Switching) network, in order to achieve fast fault detection, PE (Provider Edge, service provider edge) devices can be configured to detect LSP (Label Switched Path, Label Switched Path) through BFD ) function; further, in order to realize fast switching after detecting LSP failure, the active and standby LSPs can also be enabled on the PE device, and after detecting the main LSP failure, quickly switch the traffic to the standby LSP. [0003] Such as figure 1 As shown in the figure, it is a schematic diagram of a network where active and standby LSPs are enabled on PE devices. LSR (Label Switching Router, ...

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Problems solved by technology

[0005] In the prior art, when the active LSR A performs BFD detection on the primary LSP (that is, the LSP between LSR A and LSR B) and the backup LSP (that is, the LSP between LSR A, LSR C, and LSR B), the passive LSR B sends BFD packets on the route between LSR B and LSR A; when the route between LSR B and LSR A fails, the BFD detection process finds that the primary LSP will go down (failure), and that the standby LSP will go down DOWN; but in fact the backup LSP may not be faulty

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