Configuring is-is nsr, Configuring bfd for is-is – H3C Technologies H3C S5560 Series Switches User Manual

Page 175

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Step Command

Remarks

3.

Enable IS-IS GR.

graceful-restart

By default, the GR capability for IS-IS is
disabled.

4.

(Optional.) Suppress

the SA bit during
restart.

graceful-restart suppress-sa

By default, the SA bit is not suppressed.
By enabling the GR restarter to suppress the

Suppress-Advertisement (SA) bit in the hello
PDUs, the neighbors will still advertise their

adjacency with the GR restarter.

5.

(Optional.) Configure

the T1 timer.

graceful-restart t1 seconds count
count

By default, the T1 timer is 3 seconds and can
expire 10 times.

6.

(Optional.) Configure

the T2 timer.

graceful-restart t2 seconds

By default, the T2 timer is 60 seconds.

7.

(Optional.) Configure
the T3 timer.

graceful-restart t3 seconds

By default, the T2 timer is 300 seconds.

Configuring IS-IS NSR

After an active/standby switchover, the GR restarter obtains routing information from its neighbors, and

the IS-IS process must learn all the routes. If the network topology changes during the switchover,

removed routes cannot be updated to the device, which can result in blackhole routes.
NSR solves the problem by backing up IS-IS link state information from the active process to the standby
process. After an active/standby switchover, NSR can complete link state recovery and route

regeneration without requiring the cooperation of other devices.

IMPORTANT:

IS-IS NSR and IS-IS GR are mutually exclusive. Do not configure them at the same time.

To configure IS-IS NSR:

Step Command

Remarks

1.

Enter system view.

system-view

N/A

2.

Enter IS-IS view.

isis [ process-id ] [ vpn-instance
vpn-instance-name ]

N/A

3.

Enable IS-IS NSR.

non-stop-routing

By default, IS-IS NSR is disabled.

Configuring BFD for IS-IS

BFD provides a single mechanism to quickly detect and monitor the connectivity of links between OSPF

neighbors, reducing network convergence time. For more information about BFD, see High Availability

Configuration Guide.
To configure BFD for IS-IS:

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