R21xx-HP FlexFabric 11900 Layer 3 IP Routing Command Reference

160
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.
Syntax
graceful-restart t1 seconds count count
undo graceful-restart t1
Default
The T1 timer is 3 seconds and can expire 10 times.
Views
IS-IS view
Predefined user roles
network-admin
Parameters
seconds: Specifies the T1 timer in the range of 3 to 10 seconds.
count: Specifies the number of times that the T1 timer can expire, in the range of 1 to 20.
Usage guidelines
The T1 timer specifies the number of times that GR Restarter can send a Restart TLV with the RR bit set.
After restart, the GR Restarter sends a Restart TLV with the RR bit set to its neighbor. If the restarting router
receives a Restart TLV with the RA set from its neighbor before the T1 timer expires, the GR process starts.
Otherwise, the GR process fails.
Examples
# Configure the T1 timer of IS-IS process 1 as 5 seconds, and the expiration times as 5.