Configuring Graceful Restart For Isis-Spb; Tuning Isis-Spb Adjacency Maintenance Settings - H3C S12500 Series Configuration Manual

Configuring Graceful Restart for ISIS-SPB

Enable this feature before you re-enable SPBM or perform an active/standby switchover. Graceful
Restart ensures nonstop forwarding while ISIS-SPB processes are re-establishing their adjacency.
To prevent service interruption during an active/standby switchover, H3C recommends that you enable
this feature.
To configure Graceful Restart for ISIS-SPB:
Step
1. Enter system view.
2. Enter SPBM view.
3. Enable Graceful Restart for
ISIS-SPB.
4. (Optional.) Set the SA bit in
ISIS-SPB hello PDUs.
5. (Optional.) Set the T2 timer.

Tuning ISIS-SPB adjacency maintenance settings

ISIS-SPB uses the ISIS-SPB hello interval and the hello multiplier for adjacency establishment and
maintenance.
Adjacency hold time sets the maximum amount of time for one SPBM node to retain the adjacency with
another. This timer determines the amount of time it takes for an SPBM node to detect a failed link.
The adjacency hold time equals the ISIS-SPB hello interval multiplied by the hello multiplier.
An SPBM node sends its adjacency hold time in hello packets to update the adjacencies with its neighbor.
The neighbor removes the adjacency with the advertising node and recalculates routes if it does not
receive a hello packet before the timer expires.
Configuring the ISIS-SPB hello interval
ISIS-SPB sends hellos over links to establish and maintain adjacencies between SPBM nodes.
A short interval improves network convergence time, but it requires more system resources.
To configure the ISIS-SPB hello interval on an interface:
Command
system-view
spbm
graceful-restart
graceful-restart suppress-sa
graceful-restart t2 t2-value
25
Remarks
N/A
N/A
By default, ISIS-SPB Graceful Restart is
disabled.
By default, the Suppress-Advertisement
(SA) bit is not set.
If the SA bit is set, the ISIS-SPB
neighbors will continue to advertise the
adjacency with the device while the
device is restarting.
The default T2 timer for ISIS-SPB
Graceful Restart is 300 seconds.
This timer sets the maximum adjacency
hold time. If the restarting ISIS-SPB
process fails to complete restarting
before this timer expires, the peer
ISIS-SPB process removes the
adjacency with the restarting ISIS-SPB.