BFD for IPv6 static routes configuration example (indirect next hop)
Network requirements
As shown in Figure 20:
Switch A has a route to interface Loopback 1 (2::9/128) on Switch B, and the output interface is VLAN-interface 10.
Switch B has a route to interface Loopback 1 (1::9/128) on Switch A, and the output interface is VLAN-interface 12.
Switch D has a route to 1::9/128, and the output interface is VLAN-interface 10. It also has a route to 2::9/128, and the output interface is VLAN-interface 12.
Configure the following:
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 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 Switch A and Switch B can communicate through Switch C.
Figure 20: Network diagram
Table 10: Interface and IP address assignment
Device | Interface | IPv6 address |
|---|---|---|
Switch A | Vlan-int10 | 12::1/64 |
Switch A | Vlan-int11 | 10::102/64 |
Switch A | Loop1 | 1::9/128 |
Switch B | Vlan-int12 | 11::2/64 |
Switch B | Vlan-int13 | 13::1/64 |
Switch B | Loop1 | 2::9/128 |
Switch C | Vlan-int11 | 10::100/64 |
Switch C | Vlan-int13 | 13::2/64 |
Switch D | Vlan-int10 | 12::2/64 |
Switch D | Vlan-int12 | 11::1/64 |
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 packet mode for the IPv6 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] ipv6 route-static 120:: 64 2::9 bfd control-packet bfd-source 1::9 [SwitchA] ipv6 route-static 120:: 64 10::100 preference 65 [SwitchA] ipv6 route-static 2::9 128 12::2 [SwitchA] quit
# Configure IPv6 static routes on Switch B and enable BFD control packet mode for the static route that traverses Switch D.
<SwitchB> system-view [SwitchB] bfd multi-hop min-transmit-interval 500 [SwitchB] bfd multi-hop min-receive-interval 500 [SwitchB] bfd multi-hop detect-multiplier 9 [SwitchB] ipv6 route-static 121:: 64 1::9 bfd control-packet bfd-source 2::9 [SwitchB] ipv6 route-static 121:: 64 13::2 preference 65 [SwitchB] ipv6 route-static 1::9 128 11::1 [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
# Configure IPv6 static routes on Switch D.
<SwitchD> system-view [SwitchD] ipv6 route-static 120:: 64 11::2 [SwitchD] ipv6 route-static 121:: 64 12::1 [SwitchD] ipv6 route-static 2::9 128 11::2 [SwitchD] ipv6 route-static 1::9 128 12::1
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: 1::9
Destination IP: 2::9
Session State: Up Interface: N/A
Hold Time: 2012ms
The output shows that the BFD session has been created.
# Display the 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 : 2::9 Preference: 60 Interface : Vlan10 Cost : 0 Static Routing table Status : <Inactive> Summary Count : 0
The output shows that Switch A communicates 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.