BFD for IPv6 static routes configuration example (direct next hop)
Network requirements
As shown in Figure 83:
Configure an IPv6 static route to subnet 120::/64 on Switch A.
Configure an IPv6 static route to subnet 121::/64 on Switch B.
Enable BFD for both routes.
Configure an IPv6 static route to subnet 120::/64 and an IPv6 static route to subnet 121::/64 on Switch C.
When the link between Switch A and Switch B through the Layer 2 switch fails, BFD can detect the failure immediately, and Switch A and Switch B can communicate through Switch C.
Figure 83: Network diagram
Table 19: Interface and IP address assignment
Device | Interface | IPv6 address |
|---|---|---|
Switch A | Vlan-int10 | 12::1/64 |
Switch A | Vlan-int11 | 10::102/64 |
Switch B | Vlan-int10 | 12::2/64 |
Switch B | Vlan-int13 | 13::1/64 |
Switch C | Vlan-int11 | 10::100/64 |
Switch C | Vlan-int13 | 13::2/64 |
Configuration procedure
Configure IPv6 addresses for interfaces. (Details not shown.)
Configure IPv6 static routes and BFD:
# Configure IPv6 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] ipv6 route-static 120:: 64 vlan-interface 10 FE80::2E0:FCFF:FE58:123E bfd control-packet [SwitchA] ipv6 route-static 120:: 64 10::100 preference 65 [SwitchA] quit
# Configure IPv6 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 [SwitchB-vlan-interface10] bfd min-transmit-interval 500 [SwitchB-vlan-interface10] bfd min-receive-interval 500 [SwitchB-vlan-interface10] bfd detect-multiplier 9 [SwitchB-vlan-interface10] quit [SwitchB] ipv6 route-static 121:: 64 vlan-interface 10 FE80::2A0:FCFF:FE00:580A bfd control-packet [SwitchB] ipv6 route-static 121:: 64 vlan-interface 13 13::2 preference 65 [SwitchB] quit
# Configure IPv6 static routes on Switch C.
<SwitchC> system-view [SwitchC] ipv6 route-static 120:: 64 13::1 [SwitchC] ipv6 route-static 121:: 64 10::102
Verifying the configuration
# Display the BFD sessions on Switch A.
<SwitchA> display bfd session
Total Session Num: 1 Up Session Num: 1 Init Mode: Active
IPv6 Session Working Under Ctrl Mode:
Local Discr: 513 Remote Discr: 33
Source IP: FE80::2A0:FCFF:FE00:580A (link-local address of VLAN-interface 10 on Switch A)
Destination IP: FE80::2E0:FCFF:FE58:123E (link-local address of VLAN-interface 10 on Switch B)
Session State: Up Interface: Vlan10
Hold Time: 2012ms
The output shows that the BFD session has been created.
# Display IPv6 static routes on Switch A.
<SwitchA> display ipv6 routing-table protocol static Summary Count : 1 Static Routing table Status : <Active> Summary Count : 1 Destination: 120::/64 Protocol : Static NextHop : 12::2 Preference: 60 Interface : Vlan10 Cost : 0 Direct Routing table Status : <Inactive> Summary Count : 0
The output shows that Switch A communicates with Switch B through VLAN-interface 10. The link over VLAN-interface 10 fails.
# Display IPv6 static routes on Switch A again.
<SwitchA> display ipv6 routing-table protocol static Summary Count : 1 Static Routing table Status : <Active> Summary Count : 1 Destination: 120::/64 Protocol : Static NextHop : 10::100 Preference: 65 Interface : Vlan11 Cost : 0 Static Routing table Status : < Inactive> Summary Count : 0
The output shows that Switch A communicates with Switch B through VLAN-interface 11.