Deployment Guide

Related
Commands
● area-password — configures an IS-IS area authentication password.
● isis priority — configures the authentication password for an interface.
graceful-restart ietf
Enable graceful restart on an IS-IS router.
C9000 Series
Syntax
graceful-restart ietf
To return to the default, use the no graceful-restart ietf command.
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 Description
9.9(0.0) Introduced on the C9010.
9.5(0.1) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.12.0 Introduced on the S4810.
8.3.11.1 Introduced on the Z9000.
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.
C9000 Series
Syntax
graceful-restart interval minutes
To return to the default, use the no graceful-restart interval command.
820 Intermediate System to Intermediate System (IS-IS)