Reference Guide

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Usage
Information
A Restart TLV included in every Graceful Restart enabled router’s HELLO PDUs. This enables the
(re)starting as well as the existing ISIS peers to detect the GR capability of the routers on the connected
network. A flag in the Restart TLV contains Restart Request (RR), Restart Acknowledge (RA) and
Suppress Adjacency Advertisement (SA) bit flags.
The ISIS Graceful Restart enabled router can co-exist in mixed topologies where some routers are
Graceful Restart enabled and others are not. For neighbors that are not Graceful Restart enabled, the
restarting router brings up the adjacency per the susal methods.
graceful-restart interval
e
Set the Graceful Restart grace period, the time during which all Graceful Restart attempts are
prevented.
Syntax
graceful-restart interval minutes
To return to the default, use the no graceful-restart interval command.
Parameters
Defaults
5 minutes
Command Modes
ROUTER ISIS
Command
History
graceful-restart t1
e
Set the Graceful Restart wait time before unacknowledged restart requests are generated. This is the
interval before the system sends a Restart Request (an IIH with RR bit set in Restart TLV) until the
CSNP is reveived from the helping router.
Syntax
graceful-restart t1 {interval seconds | retry-times value}
To return to the default, use the no graceful-restart t1command.
Parameters
Defaults
see above
Command Modes
ROUTER ISIS
minutes
Range: 1-20 minutes
Default: 5 minutes
Version 8.3.1.0 Introduced on the E-Series
interval
Enter the keyword interval to set the wait time.
Range: 5-120 seconds
Default: 5 seconds
retry-times
Enter the keyword retry-times to set the number of times the
request interval is extended until a CSNP is received from the
helping router.
Range: 1-10 attempts
Default: 1