3Com S7906E Configuration Manual page 761

Configuration procedure
1) Configure IP addresses of the interfaces on each switch and configure IS-IS.
Follow Figure 1-18 to configure the IP address and subnet mask of each interface. The configuration
procedure is omitted.
Configure IS-IS on the switches, ensuring that 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. The
configuration procedure is omitted here.
2) Configure IS-IS Graceful Restart.
# Enable IS-IS Graceful Restart on Switch A and configure the Graceful Restart Interval.
<SwitchA> system-view
[SwitchA] isis 1
[SwitchA-isis-1] graceful-restart
[SwitchA-isis-1] graceful-restart interval 150
[SwitchA-isis-1] return
Configurations for Switch B and Switch C are similar and therefore are omitted here.
3) Verify the configuration.
After Router A establishes adjacencies with Router B and Router C, they begin to exchange routing
information. Restart IS-IS on Router A, which enters into the restart state and sends connection
requests to its neighbors through the Graceful Restart mechanism to synchronize the LSDB. Using the
display isis graceful-restart status command can display the IS-IS GR status on Router A.
# Restart the IS-IS process on Switch A.
<SwitchA> reset isis all 1
Warning : Reset ISIS process? [Y/N]:y
# Check the Graceful Restart status of IS-IS on Switch A.
<SwitchA> display isis graceful-restart status
Restart information for IS-IS(1)
--------------------------------------------------------------------
IS-IS(1) Level-1 Restart Status
Restart Interval: 150
SA Bit Supported
Total Number of Interfaces = 1
Restart Status: RESTARTING
Number of LSPs Awaited: 3
T3 Timer Status:
Remaining Time: 140
T2 Timer Status:
Remaining Time: 59
IS-IS(1) Level-2 Restart Status
Restart Interval: 150
SA Bit Supported
Total Number of Interfaces = 1
Restart Status: RESTARTING
Number of LSPs Awaited: 3
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