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Cisco IOS in a Nutshell, 2nd Edition by James Boney

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Name

timers basic — router

Synopsis

timers basic update-value invalid-value holddown-value flush-value [sleeptime-
value]
no timers basic

Configures

Routing protocol timers

Default

The default timer values are shown in Table 17-25.

Table 17-25. Default timer values

Timer

IGRP

RIP default

update

90 seconds

30 seconds

invalid

270 seconds

180 seconds

holddown

280 seconds

180 seconds

flush

630 seconds

240 seconds

sleeptime

0 milliseconds

N/A

Description

This command allows you to adjust the routing timers. All values expect for sleeptime are in seconds.

update-value

The interval at which routing updates are sent.

invalid-value

The interval after which a route is considered invalid if an update does not arrive.

holddown-value

The time that the router waits after deciding that a route is invalid before accepting further information about it. For example, if a router decides that a certain route has become invalid, it waits for the hold-down period to pass before believing any other information stating that the route is valid. This procedure helps to maintain routing stability.

flush-value

The interval after which invalid routes are purged from the routing table.

sleeptime-value

Optional. This timer’s value is the interval in milliseconds to wait after a flash update. This value should be less than the update value. Sleeptime is not applicable to RIP.

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