Reference Guide

Usage
Information
Every graceful restart enabled router’s HELLO PDUs includes a restart TLV. This restart
enables (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 usual methods.
graceful-restart interval
Set the graceful restart grace period, the time during that all graceful restart attempts are prevented.
S4820T
Syntax
graceful-restart interval minutes
To return to the default, use the no graceful-restart interval command.
Parameters
minutes Enter the graceful-restart interval minutes. The range is from 1 to 20
minutes. The default is 5 minutes.
Defaults 5 minutes
Command Modes ROUTER ISIS
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.12.0 Introduced on the S4810.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.1.0 Introduced on the E-Series.
graceful-restart restart-wait
Enable the graceful restart maximum wait time before a restarting peer comes up.
S4820T
Syntax
NOTE: Set the t3 timer to adjacency on the restarting router when implementing this
command.
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