Administrator 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 ag in the
Restart TLV contains restart request (RR), restart acknowledge (RA) and suppress adjacency advertisement (SA)
bit ags.
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.
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-specic. For command information about other platforms, see the relevant Dell Networking
OS Command Line Reference Guide.
Version Description
9.8(1.0) Introduced on the Z9100–ON.
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000-ON.
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.
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.
Syntax
NOTE: Set the t3 timer to adjacency on the restarting router when implementing this command.
graceful-restart restart-wait seconds
Intermediate System to Intermediate System (IS-IS) 863