A method and device for forwarding mpls data packets

Abstract

The invention discloses a method and device for forwarding MPLS data packets, which are used for realizing correct forwarding of MPLS data packets in the mixed networking environment of SR network and non-SR network. The method is as follows: when the first SR router in the SR network obtains the MPLS packet to be sent, it judges whether the next-hop router supports the SR feature; when the first SR router determines that the next-hop router does not support the SR feature, it sends the MPLS The data packet is encapsulated into the IP tunnel, and the encapsulated MPLS data packet is sent to the next-hop router, so that the encapsulated MPLS data packet is forwarded to the second SR router based on the IP routing table. In this way, the correct forwarding of MPLS data packets can be completed in the mixed networking environment of SR routers and non-SR routers, thereby meeting the requirements of incremental deployment of SR networks.

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 using the Interior Gateway Protocol (InteriorGateway Protocol, IGP) to transfer the SR router (SR router) corresponding to the global significance or local significance of the Multi-Protocol Label Switching (Muti-Protocol Label Switching) , MPLS) label method, 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 significanc...

AI Technical Summary

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

by figure 1 The scenario shown is an example, see figure 2 As shown, assume that C does not support the SR feature, but according to the ISIS and OSPF protocols, 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 to say, when C receives the TLV containing SR-related information (such as node segment Label), although it cannot be recognized, it will still spread to the surrounding neighbor nodes, such as B and D; however, on the data plane , when B forwards the MPLS packet received from A to Z (the top label of the packet is the node segment label corresponding to Z, ie 65), to C, since C does not support the SR feature (that is, in the data plane does not have corresponding MPLS forwarding entries), 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

Images