Dell PowerEdge FN I/O Module Command Line Reference Guide 9.10(0.0)

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graceful-restart ietf

Enable graceful restart on an IS-IS router.

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

Supported Modes

Full–Switch

Command History

Version	Description
9.9(0.0)	Introduced on the FN IOM.
9.2(0.0)	Introduced on the MXL 10/40GbE Switch IO Module.

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.