[SwitchA] interface vlanif10
[SwitchA-Vlanif10] ip address 100.1.1.1 24
[SwitchA-Vlanif10] quit
The configurations of Switch B and Switch are similar to the configuration of Switch A, and
are not mentioned here.
Step 3 Configure the basic function of IS-IS. The configuration procedure is not mentioned here.
Step 4 Configure IS-IS GR.
# Enable IS-IS GR on Switch A and set the restart interval. The configurations on Switch B and
Switch C are the same as the configurations on Switch A. Switch A is taken as an example here.
[SwitchA] isis 1
[SwitchA-isis-1] graceful-restart
[SwitchA-isis-1] graceful-restart interval 150
[SwitchA-isis-1] quit
Step 5 Verify the configuration.
# Run the display fib command on Switch A to view the Forwarding Information Base (FIB)
table.
<SwitchA> display fib
Route Flags: G - Gateway Route, H - Host Route, U - Up Route
S - Static Route, D - Dynamic Route, B - Black Hole Route
FIB Table:
Total number of Routes : 5
Destination/Mask Nexthop Flag TimeStamp Interface TunnelID
127.0.0.1/32 127.0.0.1 HU t[21] InLoop0 0x0
127.0.0.0/8 127.0.0.1 U t[21] InLoop0 0x0
100.1.1.1/32 127.0.0.1 HU t[20678] InLoop0 0x0
100.1.1.0/24 100.1.1.1 U t[20678] Vlanif10 0x0
100.2.1.0/24 100.1.1.2 DGU t[79388] Vlanif10 0x0
# Reset the IS-IS process by using the GR method on Switch A.
<SwitchA> reset isis all
NOTE
The Switch restarts an IS-IS process in GR mode only when GR is enabled for the IS-IS process.
# Run the display fib command on Switch A and view the FIB table to check whether GR works
normally. If GR works normally, the FIB table does not change and the forwarding service is
not affected when Switch A restarts the IS-IS process in GR mode.
<SwitchA> display fib
Route Flags: G - Gateway Route, H - Host Route, U - Up Route
S - Static Route, D - Dynamic Route, B - Black Hole Route
FIB Table:
Total number of Routes : 5
Destination/Mask Nexthop Flag TimeStamp Interface TunnelID
127.0.0.1/32 127.0.0.1 HU t[21] InLoop0 0x0
127.0.0.0/8 127.0.0.1 U t[21] InLoop0 0x0
100.1.1.1/32 127.0.0.1 HU t[20678] InLoop0 0x0
100.1.1.0/24 100.1.1.1 U t[20678] Vlanif10 0x0
100.2.1.0/24 100.1.1.2 DGU t[79388] Vlanif10 0x0
As shown in the display, the FIB table on Switch A does not change and the forwarding service
is not affected.
# Disable IS-IS GR on Switch A.
[SwitchA] isis 1
[SwitchA-isis-1] undo graceful-restart
[SwitchA-isis-1] quit
S6700 Series Ethernet Switches
Configuration Guide - IP Routing 6 IS-IS Configuration
Issue 01 (2012-03-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
340
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