H3C Technologies H3C S12500-X Series Switches User Manual
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138B
BFD for static routes configuration example (indirect next hop)
451B
Network requirements
In
897H
Figure 4
, Switch A has a route to interface Loopback 1 (2.2.2.9/32) on Switch B, with the output
interface VLAN-interface 10. Switch B has a route to interface Loopback 1 (1.1.1.9/32) on Switch A, with
the output interface VLAN-interface 12. Switch D has a route to 1.1.1.9/32, with the output interface
VLAN-interface 10, and a route to 2.2.2.9/32, with the output interface VLAN-interface 12.
Configure a static route to subnet 120.1.1.0/24 on Switch A, and 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 both Switch C and Switch D. When the link between Switch A and
Switch B through Switch D fails, BFD can detect the failure immediately and inform Switch A and Switch
B to communicate through Switch C.
Figure 4 Network diagram
Device Interface IP
address
Device
Interface
IP address
Switch A
Vlan-int10
12.1.1.1/24
Switch B
Vlan-int12 11.1.1.1/24
Vlan-int11
10.1.1.102/24
Vlan-int13
13.1.1.1/24
Loop1
1.1.1.9/32
Loop1
2.2.2.9/32
Switch C
Vlan-int11
10.1.1.100/24
Switch D
Vlan-int10 12.1.1.2/24
Vlan-int13
13.1.1.2/24
Vlan-int12
11.1.1.2/24
452B
Configuration procedure
1.
Configure IP addresses for 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 Switch D.
<SwitchA> system-view
[SwitchA] bfd multi-hop min-transmit-interval 500
[SwitchA] bfd multi-hop min-receive-interval 500
[SwitchA] bfd multi-hop detect-multiplier 9
[SwitchA] ip route-static 120.1.1.0 24 2.2.2.9 bfd control-packet bfd-source 1.1.1.9
[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 Switch D.
<SwitchB> system-view