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Configuration Guide - IP Unicast Routing

S7700 and S9700 V200R013C00

This document describes the configurations of IP Unicast Routing, including IP Routing, Static Route, RIP, RIPng, OSPF, OSPFv3, IPv4 IS-IS, IPv6 IS-IS, BGP, Routing Policy, IP Routing Table Management, and PBR.
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BGP GR

BGP GR

BGP graceful restart (GR) is high availability solutions that minimize the impact of device failures on user services.

BGP GR ensures that the forwarding plane continues to guide data forwarding during a device restart or active/standby switchover. The operations on the control plane, such as reestablishing peer relationships and performing route calculation, do not affect the forwarding plane. This mechanism prevents service interruptions caused by route flapping and improves network reliability.

GR concepts are as follows:

  • GR restarter

    The device that is restarted by the administrator or triggered by failures to perform GR.

  • GR helper

    The neighbor that helps the GR restarter to perform GR.

  • GR time

    The time during which the GR helper retains forwarding information after detecting the restart or active/standby switchover of the GR restarter.

The BGP GR process is as follows:
  1. Using the BGP capability negotiation mechanism, the GR restarter and helper know each other's GR capability and establish a GR session.

  2. When detecting the restart or active/standby switchover of the GR restarter, the GR helper waits to reestablish a BGP connection with the GR restarter. It does not delete the routing information and forwarding entries of the GR restarter or notify other neighbors of the restart or switchover.

  3. The GR restarter reestablishes neighbor relationships with all GR helpers before the GR time expires.

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Updated: 2019-04-08

Document ID: EDOC1100065744

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