BFD for IPv6 IS-IS configuration example
Network requirements
As shown in Figure 114, configure IPv6 IS-IS on Switch A, Switch B, and Switch C and configure BFD over the link Switch A<—>L2 Switch<—>Switch B.
After the link between Switch B and the Layer-2 switch fails, BFD can quickly detect the failure and notify IPv6 IS-IS of the failure. Then Switch A and Switch B communicate through Switch C.
Figure 114: Network diagram
Device | Interface | IPv6 address | Device | Interface | IPv6 address |
|---|---|---|---|---|---|
Switch A | Vlan-int10 | 2001::1/64 | Switch B | Vlan-int10 | 2001::2/64 |
Vlan-int11 | 2001:2::1/64 | Vlan-int13 | 2001:3::2/64 | ||
Switch C | Vlan-int11 | 2001:2::2/64 | |||
Vlan-int13 | 2001:3::1/64 |
Configuration procedure
Configure IP addresses for interfaces. (Details not shown.)
Configure IPv6 IS-IS:
# Configure Switch A.
<SwitchA> system-view [SwitchA] ipv6 [SwitchA] isis 1 [SwitchA-isis-1] is-level level-1 [SwitchA-isis-1] network-entity 10.0000.0000.0001.00 [SwitchA-isis-1] ipv6 enable [SwitchA-isis-1] quit [SwitchA] interface vlan-interface 10 [SwitchA-Vlan-interface10] isis ipv6 enable 1 [SwitchA-Vlan-interface10] quit [SwitchA] interface vlan-interface 11 [SwitchA-Vlan-interface11] isis ipv6 enable 1 [SwitchA-Vlan-interface11] quit
# Configure Switch B.
<SwitchB> system-view [SwitchB] ipv6 [SwitchB] isis 1 [SwitchB-isis-1] is-level level-1 [SwitchB-isis-1] network-entity 10.0000.0000.0002.00 [SwitchB-isis-1] ipv6 enable [SwitchB-isis-1] quit [SwitchB] interface vlan-interface 10 [SwitchB-Vlan-interface10] isis ipv6 enable 1 [SwitchB-Vlan-interface10] quit [SwitchB] interface vlan-interface 13 [SwitchB-Vlan-interface13] isis ipv6 enable 1 [SwitchB-Vlan-interface13] quit
# Configure Switch C.
<SwitchC> system-view [SwitchC] ipv6 [SwitchC] isis 1 [SwitchC-isis-1] network-entity 10.0000.0000.0003.00 [SwitchC-isis-1] ipv6 enable [SwitchC-isis-1] quit [SwitchC] interface vlan-interface 11 [SwitchC-Vlan-interface11] isis ipv6 enable 1 [SwitchC-Vlan-interface11] quit [SwitchC] interface vlan-interface 13 [SwitchC-Vlan-interface13] isis ipv6 enable 1 [SwitchC-Vlan-interface13] quit
Configure BFD functions:
# Enable BFD on Switch A and configure BFD parameters.
[SwitchA] bfd session init-mode active [SwitchA] interface vlan-interface 10 [SwitchA-Vlan-interface10] isis ipv6 bfd enable [SwitchA-Vlan-interface10] bfd min-transmit-interval 500 [SwitchA-Vlan-interface10] bfd min-receive-interval 500 [SwitchA-Vlan-interface10] bfd detect-multiplier 7 [SwitchA-Vlan-interface10] return
# Enable BFD on Switch B and configure BFD parameters.
[SwitchB] bfd session init-mode active [SwitchB] interface vlan-interface 10 [SwitchB-Vlan-interface10] isis ipv6 bfd enable [SwitchB-Vlan-interface10] bfd min-transmit-interval 500 [SwitchB-Vlan-interface10] bfd min-receive-interval 500 [SwitchB-Vlan-interface10] bfd detect-multiplier 6
Verify the configuration:
# Display the BFD information on Switch A.
<SwitchA> display bfd session Total Session Num: 1 Init Mode: Active IPv6 Session Working Under Ctrl Mode: Local Discr: 1441 Remote Discr: 1450 Source IP: FE80::20F:FF:FE00:1202 (link-local address of VLAN-interface 10 on Switch A) Destination IP: FE80::20F:FF:FE00:1200 (link-local address of VLAN-interface 10 on Switch B) Session State: Up Interface: Vlan10 Hold Time: /# Display routes destined for 2001:4::0/64 on Switch A.
<SwitchA> display ipv6 routing-table 2001:4::0 64 verbose Routing Table : Summary Count : 1 Destination : 2001:4::0 PrefixLength : 64 NextHop : 2001::2 Preference : 15 IpPrecedence : QosLcId : RelayNextHop : :: Tag : 0H Neighbor : :: ProcessID : 0 Interface : Vlan-interface10 Protocol : ISISv6 State : Active Adv Cost : 20 Tunnel ID : 0x0 Label : NULL Age : 4538sec
The output shows that Switch A and Switch B communicate through VLAN-interface 10.
When the link over VLAN-interface 10 fails, BFD can quickly detect the failure.
# Display the BFD information on Switch A.
<SwitchA> display bfd session
Switch A has deleted the BFD session on VLAN-interface 10 to Switch B and displays no output.
# Display routes destined for 2001:4::0/64 on Switch A.
<SwitchA> display ipv6 routing-table 2001:4::0 64 verbose Routing Table : Summary Count : 1 Destination : 2001:4::0 PrefixLength : 64 NextHop : 2001:2::2 Preference : 15 IpPrecedence : QosLcId : RelayNextHop : :: Tag : 0H Neighbor : :: ProcessID : 0 Interface : Vlan-interface11 Protocol : ISISv6 State : Active Adv Cost : 30 Tunnel ID : 0x0 Label : NULL Age : 4610sec
The output shows that Switch A and Switch B communicate through VLAN-interface 11.