HP 5920 Series User Manual

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Usage guidelines
IS-IS GR and IS-IS NSR are mutually exclusive. Therefore, do not configure the graceful-restart command
and the non-stop-routing command at the same time.
Examples
# Enable GR for IS-IS process 1.
<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] graceful-restart
Related commands
graceful-restart suppress-sa
graceful-restart suppress-sa
Use graceful-restart suppress-sa to suppress the Suppress-Advertisement (SA) bit during restart.
Use undo graceful-restart suppress-sa to set the SA bit.
Syntax
graceful-restart suppress-sa
undo graceful-restart suppress-sa
Default
The SA bit is set during restart.
Views
IS-IS view
Predefined user roles
network-admin
Usage guidelines
Suppressing the SA bit is mainly for avoiding black hole route. If a router starts or reboots without
keeping the local forwarding table, sending packets to the router might result in a severe packet loss. To
avoid this, you can set the SA bit of the hello packet sent by the GR restarter to 1. Upon receiving such
hello packets, the GR helpers will not advertise the GR restarter through LSP.
Examples
# Suppress the SA bit during graceful restart.
<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] graceful-restart suppress-sa
Related commands
graceful-restart
graceful-restart t1
Use graceful-restart t1 to configure the T1 timer.
Use undo graceful-restart t1 to restore the default.

HP 5920 Series Specifications

General

Brand	HP
Model	5920 Series
Category	Switch
Language	English