H3C Technologies H3C S12500 Series Switches - Manual (Page 33)

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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 Command Remarks
1. Enter system view. system-view N/A
2. Enter SPBM view. spbm N/A
3. Enable Graceful Restart for
ISIS-SPB.
graceful-restart
By default, ISIS-SPB Graceful Restart is
disabled.
4. (Optional.) Set the SA bit in
ISIS-SPB hello PDUs.
graceful-restart suppress-sa
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.
5. (Optional.) Set the T2 timer. graceful-restart t2 t2-value
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.
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: