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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)
--------------------------------
Restart status: COMPLETE
Restart phase: Finish
Restart t1: 3, count 10; Restart t2: 60; Restart t3: 300
SA Bit: supported
Level-1 restart information
---------------------------
Total number of interfaces: 1
Number of waiting LSPs: 0
Level-2 restart information
---------------------------
Total number of interfaces: 1
Number of waiting LSPs: 0
IS-IS NSR configuration example
Network requirements
As shown in Figure 45, Switch S, Switch A, and Switch B belong to the same IS-IS routing domain. Run
IS-IS on all the switches to interconnect them with each other. Enable IS-IS NSR on Switch S to ensure
forwarding continuity between Switch A and Switch B when an active/standby switchover occurs on
Switch S.
Figure 45 Network diagram
Configuration procedure
1. Configure the IP addresses and subnet masks for interfaces on the switches. (Details not shown.)
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