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Configuration Guide - IP Unicast Routing

CloudEngine 12800 and 12800E V200R002C50

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, and PBR.

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Configuring RIPng Timers

Configuring RIPng Timers


RIPng uses 4 timers: Update, Age, Suppress, and Garbage-collect. Changing the timer values affects the convergence speed of RIPng routes.


  1. Run system-view

    The system view is displayed.

  2. Run ripng [ process-id ] [ vpn-instance vpn-instance-name ]

    The RIPng process is enabled and the RIPng view is displayed.

  3. Run timers ripng update age suppress garbage-collect

    RIPng timers are configured.

    • RIPng timers take effect immediately after being changed.

    • Route flapping occurs if the values of the four timers are set improperly. The relationship between the values is as follows: update must be smaller than age and suppress must be smaller than garbage-collect. For example, if the update time is longer than the aging time, and a RIPng route changes within the update time, the switch cannot inform its neighbors of the change on time.

    • You must configure RIPng timers based on the network performance and uniformly on all the routers running RIPng. This avoids unnecessary network traffic or route flapping.

    By default, the Update timer is 30s; the Age timer is 180s; the Suppress timer is 0s; the Garbage-collect timer is four times the Update timer, namely, 120s.

    In practice, the Garbage-collect timer is not fixed. If the Update timer is set to 30s, the Garbage-collect timer may range from 90s to 120s.

    Before permanently deleting an unreachable route from the routing table, RIPng advertises this route (with the metric being set to 16) by periodically sending Update packets four times. Subsequently, all the neighbors know that this route is unreachable. Because a route may not always become unreachable at the beginning of an Update period, the Garbage-collect timer is actually three or four times the Update timer.

  4. Run commit

    The configuration is committed.

Updated: 2019-03-21

Document ID: EDOC1000166601

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