Command Line Reference Guide

Parameters
ietf Enter ietf to enable graceful restart on the IS-IS router.
Defaults Graceful restart disabled.
Command
Modes
ROUTER ISIS
Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version 9.0.2.0 Introduced on the S6000.
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 6.3.1.0 Introduced on the E-Series.
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.
Z9000
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.
844
Intermediate System to Intermediate System (IS-IS)