Method and device for forwarding MPLS data packet

Abstract

The invention discloses a method and device for forwarding an MPLS data packet, which are used for realizing correct forwarding of the MPLS data packet in a hybrid networking environment of an SR network and a non-SR network. The method comprises the steps that when an MPLS data packet to be sent is obtained by a first SR router in an SR network, whether a next-hop router supports SR characteristics or not is judged; when the first SR router determines that the next-hop router does not support the SR characteristics, the MPLS data packet is encapsulated into an IP tunnel, and the encapsulatedMPLS data packet is sent to the next-hop router; and the encapsulated MPLS data packet is forwarded to a second SR router based on an IP routing table. In this way, correct forwarding of the MPLS datapacket is completed under the hybrid networking environment of the SR router and the non-SR router, so that the requirement of SR network incremental deployment is met.

Description

technical field [0001] The invention relates to network communication technology, in particular to a method and device for forwarding MPLS data packets. Background technique [0002] Segment Routing (SR) is a control plane that uses the Interior Gateway Protocol (InteriorGateway Protocol, IGP) to transfer the SR router (SR router) corresponding to the multi-protocol label switching (Muti-Protocol Label Switching) with global or local significance. , MPLS) label method, and typical IGPs include Intermediate System to Intermediate System (IS-IS) and Open Shortest Path First (OSPF). [0003] The data plane forwards MPLS data packets based on the MPLS labels distributed by the Segment Routing control plane, so as to simplify the operation and maintenance management of MPLS networks. [0004] In order to facilitate the understanding of the segment routing technical solution, the following uses an example in which the control plane distributes labels with global significance. ...

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Problems solved by technology

[0006]However, the existing Segment Routing technical solution does not consider the mixed networking scenario of SR routers and non-SR routers

Take the scene shown in Figure 1 as an example, refer to Figure 2, it is assumed that C does not support the SR feature, but according to The ISIS and OSPF protocols stipulate that on the control plane, if an ISIS or OSPF node receives an unknown type length value (Type Length and Value, TLV), it will still send the TLV to its neighbor nodes, that is, C receives a message containing Although the TLV of SR-related information (such as node segment Label) cannot be recognized, it will still spread to the surrounding neighbor nodes, such as B and D; however, on the data plane, when B receives from A, the destination is Z When the MPLS data packet (the top label of the data packet is the node segment label corresponding to Z, namely 65) is forwarded to C, since C does not support the SR feature (that is, it does not have a corresponding MPLS forwarding entry on the data plane), therefore , C will discard the received MPLS packets

[0007] In summary, when SR routers and non-SR routers are used in a mixed network, packet loss will inevitably occur due to routers not supporting SR features , so that MPLS data packets cannot be correctly forwarded in a mixed network environment

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