Graceful-Restart Suppress-Sa - 3Com S7906E Command Reference Manual

Parameters
interval-value: Graceful Restart interval, in the range 30 to 1800 seconds.
Description
Use the graceful-restart interval command to configure the Graceful Restart interval.
Use the undo graceful-restart interval command to restore the default Graceful Restart interval.
By default, the Graceful Restart interval is 300 seconds.
Examples
# Configure the Graceful Restart interval for IS-IS process 1 as 120 seconds.
<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] graceful-restart interval 120

graceful-restart suppress-sa

Syntax
graceful-restart suppress-sa
undo graceful-restart suppress-sa
View
IS-IS view
Default Level
2: System level
Parameters
None
Description
Use the graceful-restart suppress-sa command to suppress the SA (Suppress-Advertisement) bit
during restart.
Use the undo graceful-restart suppress-sa command to set the SA bit.
By default, the SA bit is set during restart.
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 may 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
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