121
Flags: 0x1008c OrigNextHop: 10.1.1.100
Label: NULL RealNextHop: 10.1.1.100
BkLabel: NULL BkNextHop: N/A
Tunnel ID: Invalid Interface: Vlan-interface11
BkTunnel ID: Invalid BkInterface: N/A
The output shows that Switch A communicates with Switch B through VLAN-interface 11.
OSPF FRR configuration example
Network requirements
As shown in Figure 32, Switch A, Switch B, and Switch C reside in the same OSPF domain.
Configure OSPF FRR so that when the link between Switch A and Switch B fails, traffic is
immediately switched to Link B.
Figure 32 Network diagram
Table 10 Interface and IP address assignment
Device Interface IP address
Switch A Vlan-int100 12.12.12.1/24
Switch A Vlan-int200 13.13.13.1/24
Switch A Loop0 1.1.1.1/32
Switch B Vlan-int101 24.24.24.4/24
Switch B Vlan-int200 13.13.13.2/24
Switch B Loop0 4.4.4.4/32
Switch C Vlan-int100 12.12.12.2/24
Switch C Vlan-int101 24.24.24.2/24
Configuration procedure
1. Configure IP addresses and subnet masks for interfaces on the switches. (Details not shown.)
2. Configure OSPF on the switches to ensure that Switch A, Switch B, and Switch C can
communicate with each other at the network layer. (Details not shown.)
3. Configure OSPF FRR to automatically calculate the backup next hop:
You can enable OSPF FRR to either calculate a backup next hop by using the LFA algorithm, or
specify a backup next hop by using a routing policy.
{ (Method 1.) Enable OSPF FRR to calculate the backup next hop by using the LFA algorithm:
# Configure Switch A.
<SwitchA> system-view
[SwitchA] bfd echo-source-ip 2.2.2.2
Switch A Switch B
Switch C
Loop0
V
l
a
n
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n
t
1
0
0
Vlan-int200
Vlan-int200
V
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a
n
-i
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1
0
0
V
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a
n
-i
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t
1
0
1
V
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a
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-
i
n
t
1
0
1
Loop0
Link A
Link B
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