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<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
Parameters None
Description Use the
graceful-restart suppress-sa command to set the SA
(Suppress-Advertisement) bit during restart.
Use the
undo graceful-restart suppress-sa command to clear the SA bit
during restart.
By default, the SA bit is cleared during restart.
Note that:
■ A router that starts at the first time does not maintain the forwarding state. For
a router that restarts IS-IS, copies of LSPs generated by this router during the
previous incarnation may still exist in the lSP databases of other routers in the
network.
■ Copies of LSPs in the LSP databases in other routers which may look “newer”
than LSPs generated by the restarting router after it initializes LSP fragment
sequence numbers. This may result in temporary blackholes until subsequent
LSPs with higher sequence numbers are regenerated.
■ These blackholes can be avoided if the neighbors suppress advertising the
previous adjacencies to the restarting router until the latter has flooded LSPs
with higher sequence numbers.
Examples # Set the SA bit during Graceful Restart.
<Sysname> system-view
[Sysname] isis 1
[Sysname-isis-1] graceful-restart suppress-sa
import-route (IS-IS view)
Syntax import-route { isis [ process-id ] | ospf [ process-id ] | rip [ process-id ] | bgp
[ allow-ibgp ] | direct | static } [ cost cost | cost-type { external | internal } | [ level-1
| level-1-2 | level-2 ] | route-policy route-policy-name | tag tag ] *
undo import-route { isis [ process-id ] | ospf [ process-id ] | rip [ process-id ] | bgp |
direct | static }