Configuring Rip Timers - Huawei S6700 Series Configuration Manual

S6700 Series Ethernet Switches
Configuration Guide - IP Routing

2.8.2 Configuring RIP Timers

RIP has three timers: Update timer, Age timer and Garbage-collect timer. Changing the values
of the three timers affects the RIP convergence speed.
Context
RIP has three timers: Update timer, Age timer and Garbage-collect timer. Changing the values
of the three timers affects the RIP convergence speed. For details on timers, see corresponding
description in the chapter "RIP" in the S6700 Series Ethernet Switches Feature Description -
IP Routing.
Do as follows on the RIP switch:
Procedure
Step 1 Run:
system-view
The system view is displayed.
Step 2 Run:
rip [ process-id ]
The RIP process is enabled and the RIP view is displayed.
Step 3 Run:
timers rip update age garbage-collect
RIP timers are configured.
By default, the Update timer is 30s; the Age timer is 180s; 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, RIP 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.
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Issue 01 (2012-03-15)
NOTE
l RIP timers take effect immediately after being changed.
l Route flapping occurs if the values of the times are set improperly. The relationship between the values
is as follows: update must be smaller than age and update must be smaller than garbage-collect. For
example, if the update time is longer than the aging time, and a RIP route changes within the update
time, the switch cannot inform its neighbors of the change on time.
l You must configure RIP timers based on the network performance and uniformly on all the switches
running RIP. This avoids unnecessary network traffic or route flapping.
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2 RIP Configuration
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