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
Command History
This guide is platform-specific. For command information about other platforms, see the relevant
Dell Networking
OS Command Line Reference Guide
.
Version
Description
9.10(0.0)
Introduced on the S6100–ON.
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.
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.
Syntax
graceful-restart interval
minutes
854
Intermediate System to Intermediate System (IS-IS)