17
Configure a static route to subnet 120.1.1.0/24 on Switch A.
Configure a static route to subnet 121.1.1.0/24 on Switch B.
Enable BFD for both routes.
Configure a static route to subnet 120.1.1.0/24 and a static route to subnet 121.1.1.0/24 on
Switch C.
When the link between Switch A and Switch B through the Layer 2 switch fails, BFD can detect the
failure immediately. Switch A then communicates with Switch B through Switch C.
Figure 3 Network diagram
Table 4 Interface and IP address assignment
Switch A VLAN-interface 10 12.1.1.1/24
Switch A VLAN-interface 11 10.1.1.102/24
Switch B VLAN-interface 10 12.1.1.2/24
Switch B VLAN-interface 13 13.1.1.1/24
Switch C VLAN-interface 11 10.1.1.100/24
Switch C VLAN-interface 13 13.1.1.2/24
Configuration procedure
1. Configure IP addresses for the interfaces. (Details not shown.)
2. Configure static routes and BFD:
# Configure static routes on Switch A and enable BFD control mode for the static route that
traverses the Layer 2 switch.
<SwitchA> system-view
[SwitchA] interface vlan-interface 10
[SwitchA-vlan-interface10] bfd min-transmit-interval 500
[SwitchA-vlan-interface10] bfd min-receive-interval 500
[SwitchA-vlan-interface10] bfd detect-multiplier 9
[SwitchA-vlan-interface10] quit
[SwitchA] ip route-static 120.1.1.0 24 vlan-interface 10 12.1.1.2 bfd control-packet
[SwitchA] ip route-static 120.1.1.0 24 vlan-interface 11 10.1.1.100 preference 65
[SwitchA] quit
# Configure static routes on Switch B and enable BFD control mode for the static route that
traverses the Layer 2 switch.
<SwitchB> system-view
[SwitchB] interface vlan-interface 10
Switch A Switch B
Switch C
BFD
L
2
Switch
Vlan-int10
Vlan
-int
11
Vlan-int11
Vlan
-int
13
Vlan-
int13
Vlan-int10
121.
1
.1
.0
/
24
120.1.1.0/24
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