Bidirectional forwarding detection method and system in SRv6 network

A two-way forwarding detection and network technology, applied in the field of communication, can solve problems such as long service packet loss time, active-standby protection switching failure, etc.

CN113381933AActive Publication Date: 2021-09-10FENGHUO COMM SCI & TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2021-09-10

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Abstract

The invention discloses a bidirectional forwarding detection method in an SRv6 network, which comprises the following steps that a host node obtains a Segment List [0..N] in an SRH of a BFD message, adds a source address of the message into a first position of the Segment List [0..N], removes an address field belonging to the node from the Segment List [0..N], carries out reverse operation on the corrected Segment List [0..N] to obtain a Reversed Segment List [0..N], packages the SRH by using the Reversed segment List [0..N], sends a response message of the BFD to the source node, and achieves that a reverse path and a forward path of the dynamic BFD or SBFD are consistent. The method provided by the invention solves the problems of failure of service main and standby protection switching and overlong service packet loss time caused by inconsistency of a dynamic BFD / S-BFD reverse path and a dynamic BFD / S-BFD fault detection, and improves the competitiveness of equipment. The invention also provides a corresponding bidirectional forwarding detection system in the SRv6 network.
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Description

technical field

[0001] The invention belongs to the technical field of communication, and more specifically relates to a method and system for bidirectional forwarding detection in an SRv6 network. Background technique

[0002] As described in [RFC 5884]: If you want to use BFD (Bidirectional Forwarding Detection, bidirectional forwarding detection) on MPLS (Multiprotocol Label Switching, multi-protocol label switching), LSP (Label Switched Path, label switching path) for fault detection, you must The MPLS LSP establishes a BFD session. The BFD control message must be sent along the same data path as the LSP being verified, and be processed by the BFD processing module of the egress LSR (Label Switching Router, label switching router). BFD control packets sent from the egress LSR to the ingress LSR may be routed according to the destination IP address according to the procedure in [RFC5883].

[0003] As mentioned above, the BFD control packets are forwarded (forwarded alon...

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Embodiment Construction

[0047] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0048] The forward path of dynamic BFD and S-BFD is the same as the service path, and the service path usually has a constraint path, such as SRv6 Policy. If the reverse path is IP forwarding, the BFD reverse path of multiple services with different forward paths may be the same. If the reverse path of dynamic BFD / S-BFD is consistent with the forward path, this problem can be solved.

[0049] ...