IS-IS GR configuration example
Network requirements
As shown in Figure 43, Switch A, Switch B, and Switch C belong to the same IS-IS routing domain.
Figure 43: Network diagram
Configuration procedure
Configure IP addresses and subnet masks for interfaces. (Details not shown.)
Configure IS-IS on the switches to make sure Switch A, Switch B, and Switch C can communicate with each other at layer 3 and dynamic route update can be implemented among them with IS-IS. (Details not shown.)
Enable IS-IS GR on Switch A.
<SwitchA> system-view [SwitchA] isis 1 [SwitchA-isis-1] graceful-restart [SwitchA-isis-1] return
Verifying the configuration
After Switch A establishes adjacencies with Switch B and Switch C, they begin to exchange routing information. Restart IS-IS on Switch A, which enters the restart state and sends connection requests to its neighbors through the GR mechanism to synchronize the LSDB. To display the IS-IS GR status on Switch A, use the display isis graceful-restart status command.
# Restart the IS-IS process on Switch A.
<SwitchA> reset isis all 1 graceful-restart Reset IS-IS process? [Y/N]:y
# Check the GR status of IS-IS on Switch A.
<SwitchA> display isis graceful-restart status
Restart information for IS-IS(1)
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Restart status: COMPLETE
Restart phase: Finish
Restart t1: 3, count 10; Restart t2: 60; Restart t3: 300
SA Bit: supported
Level-1 restart information
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Total number of interfaces: 1
Number of waiting LSPs: 0
Level-2 restart information
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Total number of interfaces: 1
Number of waiting LSPs: 0