Information restoration method based on graceful restart and router

Abstract

The invention discloses an information restoration method based on graceful restart, which comprises the following steps: when a router is restarted, sending a restart message to a neighboring router which comprises an upstream neighboring router and a downstream neighboring router; receiving a path restoration message sent by the neighboring router; and restoring control information by the router according to the path restoration message, wherein the path restoration message contains the information of the neighboring router. The invention also discloses a router. By applying the embodiment of the invention, the ERO information of control planes can be precisely restored by combining the path restoration message sent by the upstream neighboring router and the downstream neighboring router, namely, the information of all state blocks in the router and the information of all objects in the state blocks can be stored so as to ensure that the restarted router can obtain the information of all control planes required by the restarted router, thereby improving the fault restoration capacity of the router control planes.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to an information recovery method and router based on graceful restart. Background technique [0002] MPLS (Multi-Protocol Label Switching, Multi-Protocol Label Switching) is a technology based on label switching, which can carry data including IPv4, IPX, ATM and other protocols, and can also work in networks including Ethernet (Ethernet), FR, PPP, etc. On the link protocol protocol, it has good scalability. RSVP (Resource Reservation Protocol, Resource Reservation Protocol) is one of the label distribution protocols of MPLS. It is used to establish LSP (LabelSwitched Path, Label Switched Path) tunnels, and provides functions including label switching services and bandwidth reservation requests. RSVP-based GR (Graceful Restart, graceful restart) provides an NSF (Non-Stop Forwarding, non-stop forwarding) mechanism for traffic. When the control plane of the routing device in t...

AI Technical Summary

Problems solved by technology

However, when router A and router B belong to the same domain in the network, but belong to different domains from routers C, D, and E, router A only saves the router port information belonging to the same domain, that is, the port information of router B (port 2, 3), at this time, if router B recovers the ERO information by receiving the Gr path message sent by router A, router B cannot Full recovery of ERO information

[0005] The inventor found in practice that when a restarted router restores the ERO information through the path restoration message sent by its upstream neighbor router, although the ERO information contains the port information of all the downstream routers corresponding to the upstream neighbor router, the When the upstream neighbor router and the downstream router of the restarted router belong to different domains, the restarted router cannot fully recover the control plane information it needs, thus causing the router's control plane to continue to fail

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