Method and device for virtual router redundancy protocol backup group issuing routing

Abstract

The invention discloses a method and a device for a virtual router redundancy protocol (VRRP) backup group issuing routing. In the invention, all members devices in the Backup state are prohibited from issuing network segment routing information of a network segment in which the VRRP backup group is located; after a two-layer network is split, new Master member devices elected after splitting only issue routing information of subset to a local host which is connected with the new Master member devices currently so as to distinguish from segment routing information issued by original Master member devices; accordingly, for a local host connected with the original Master member devices, the only available segment routing information ensure that a corresponding downlink flow is routed to the original Master member devices; and while for the local host connected with the new Master member devices, the routing information of the subset preferentially selected based on a longest match principle can ensure that a corresponding downlink flow is routed to the new Master member devices.

Description

technical field [0001] The present invention relates to VRRP (Virtual Router Redundancy Protocol, virtual router redundancy protocol) technology, in particular to a method and device for VRRP backup group publishing routes. Background technique [0002] VRRP can add multiple routing devices that can act as gateways into a VRRP backup group, and use the VRRP backup group to form a virtual routing device, so that the network in the second layer network (such as a LAN) is located in the VRRP backup group. Each local host in the segment only needs to configure the virtual routing device as the default gateway, thus simplifying the configuration of network hosts. Wherein, each routing device in the VRRP backup group may be called a member device of the VRRP backup group. [0003] In a VRRP backup group, a member device with the highest priority is elected as the master (main) state, and the rest of the member devices are in the backup (standby) state. [0004] Among them, the m...

AI Technical Summary

Problems solved by technology

[0015] but in Figure 2b , when the Layer 3 network generates downlink packet traffic of the local host C1, the downlink packet traffic may use the member device R1 in the split subnet where the local host C1 is located as the next hop, or another split subnet The member device R2 or R3 in the network is the next hop, but if the downlink packet traffic is routed to the member device R2 or R3 instead of the member device R1, the member device R2 or R3 will not be able to send the downlink packet traffic Forwarding to the local host C1 that has lost connection with it, resulting in the interruption of the downstream packet flow of the local host C1

Similarly, when the layer 3 network generates downlink packet traffic from the local host C2 or C3, if the downlink packet traffic is routed to the member device R1, the member device R1 will also be unable to forward the downlink packet traffic and lose it. The connected local host C2 or C3, which causes the downlink packet flow of the local host C2 or C3 to be interrupted

[0016] It can be seen that in the prior art, since all member devices will publish the network segment routing information of the same network segment, when the VRRP backup group is split due to the network segment of the layer 2 network, the layer 3 network will not be able to correctly distinguish the downlink packets. The next hop member device of the traffic, which may cause the downlink packet flow of the local host to be interrupted

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