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EIGRP IPv6 sessions have a shutdown option in router, address family, and address-family interface configuration modes. To enable BFD support on EIGRP IPv6 sessions, the routing process should be in no shut mode in the above mentioned modes.
The BFD Support for EIGRP IPv6 feature is supported only in EIGRP named mode.
EIGRP supports only single-hop Bidirectional Forwarding Detection (BFD).
The BFD Support for EIGRP IPv6 feature is not supported on passive interfaces.
The BFD Support for EIGRP IPv6 feature provides Bidirectional Forwarding Detection (BFD) support for Enhanced Interior Gateway Routing Protocol (EIGRP) IPv6 sessions. It facilitates rapid fault detection and alternate-path selection in EIGRP IPv6 topologies. BFD is a detection protocol that provides a consistent failure-detection method for network administrators. Network administrators use BFD to detect forwarding path failures at a uniform rate and not at variable rates for 'Hello' mechanisms of different routing protocols. This failure-detection methodology ensures easy network profiling and planning and consistent and predictable reconvergence time. This document provides information about BFD support for EIGRP IPv6 networks and explains how to configure BFD support in EIGRP IPv6 networks.
The following sections provide information on configuring BFD support for EIGRP IPv6 for an interface and all interfaces.
The following steps show how to configure BFD support on all interfaces:
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode. Enter your password if prompted. |
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
ipv6 unicast-routing Example: |
Enables the forwarding of IPv6 unicast datagrams. |
|
Step 4 |
interface type number Example: |
Specifies the interface type and number, and enters the interface configuration mode. |
|
Step 5 |
ipv6 address ipv6-address/prefix-length Example: |
Configures an IPv6 address. |
|
Step 6 |
bfd interval milliseconds min_rx milliseconds multiplier interval-multiplier Example: |
Sets the baseline BFD session parameters on an interface. |
|
Step 7 |
exit Example: |
Exits interface configuration mode and returns to global configuration mode. |
|
Step 8 |
router eigrp virtual-name Example: |
Specifies an EIGRP routing process and enters router configuration mode. |
|
Step 9 |
address-family ipv6 autonomous-system as-number Example: |
Enters address family configuration mode for IPv6 and configures an EIGRP routing instance. |
|
Step 10 |
eigrp router-id ip-address Example: |
Sets the device ID used by EIGRP for this address family when EIGRP peers communicate with their neighbors. |
|
Step 11 |
af-interface default Example: |
Configures interface-specific commands on all interfaces that belong to an address family in EIGRP named mode configurations. Enters address-family interface configuration mode. |
|
Step 12 |
bfd Example: |
Enables BFD on all interfaces. |
|
Step 13 |
End Example: |
Exits address-family interface configuration mode and returns to privileged EXEC mode. |
|
Step 14 |
show eigrp address-family ipv6 neighbors detail Example: |
(Optional) Displays detailed information about the neighbors that are discovered by EIGRP with BFD enabled on an interface. |
|
Step 15 |
show bfd neighbors Example: |
(Optional) Displays BFD information to neighbors. |
The following steps show how to configure BFD support on an interface:
| Command or Action | Purpose | |
|---|---|---|
|
Step 1 |
enable Example: |
Enables privileged EXEC mode. Enter your password if prompted. |
|
Step 2 |
configure terminal Example: |
Enters global configuration mode. |
|
Step 3 |
ipv6 unicast-routing Example: |
Enables the forwarding of IPv6 unicast datagrams. |
|
Step 4 |
interface type number Example: |
Specifies the interface type and number, and enters the interface configuration mode. |
|
Step 5 |
ipv6 address ipv6-address /prefix-length Example: |
Configures an IPv6 address. |
|
Step 6 |
bfd interval milliseconds min_rx milliseconds multiplier interval-multiplier Example: |
Sets the baseline BFD session parameters on an interface. |
|
Step 7 |
exit Example: |
Exits interface configuration mode and returns to global configuration mode. |
|
Step 8 |
router eigrp virtual-name Example: |
Specifies an EIGRP routing process and enters router configuration mode. |
|
Step 9 |
address-family ipv6 autonomous-system as-number Example: |
Enters address family configuration mode for IPv6 and configures an EIGRP routing instance. |
|
Step 10 |
eigrp router-id ip-address Example: |
Sets the device ID used by EIGRP for this address family when EIGRP peers communicate with their neighbors. |
|
Step 11 |
af-interface interface-type interface-number Example: |
Configures interface-specific commands on an interface that belongs to an address family in an EIGRP named mode configuration. Enters address-family interface configuration mode. |
|
Step 12 |
bfd Example: |
Enables BFD on the specified interface. |
|
Step 13 |
end Example: |
Exits address-family interface configuration mode and returns to privileged EXEC mode. |
|
Step 14 |
show eigrp address-family ipv6 neighbors Example: |
(Optional) Displays neighbors for which have BFD enabled. |
|
Step 15 |
show bfd neighbors Example: |
(Optional) Displays BFD information to neighbors. |
The following sections provide configuration examples for BFD support for EIGRP:
Device> enable
Device# configure terminal
Device(config)# ipv6 unicast-routing
Device(config)# interface GigabitEthernet1/1
Device(config-if)# ipv6 address 2001:0DB8:1::12/64
Device(config-if)# bfd interval 50 min_rx 50 multiplier 3
Device(config-if)# exit
Device(config)# router eigrp name
Device(config-router)# address-family ipv6 unicast autonomous-system 1
Device(config-router-af)# eigrp router-id 172.16.0.1
Device(config-router-af)# af-interface default
Device(config-router-af-interface)# bfd
Device(config-router-af-interface)# end
The following example displays the output for the show eigrp address-family ipv6 neighbors detail command.
Device# show eigrp address-family ipv6 neighbors detail
EIGRP-IPv6 VR(test) Address-Family Neighbors for AS(5)
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
0 Link-local address: Gi1/1 14 00:02:04 1 4500 0 4
GE80::10:2
Version 23.0/2.0, Retrans: 2, Retries: 0, Prefixes: 1
Topology-ids from peer - 0
Topologies advertised to peer: base
Max Nbrs: 0, Current Nbrs: 0
BFD sessions
NeighAddr Interface
GE80::10:2 GigabitEthernet1/1
The following example shows how to configure BFD Support on an interface:
Device> enable
Device# configure terminal
Device(config)# ipv6 unicast-routing
Device(config)# interface GigabitEthernet1/1
Device(config-if)# ipv6 address 2001:DB8:A:B::1/64
Device(config-if)# bfd interval 50 min_rx 50 multiplier 3
Device(config-if)# exit
Device(config)# router eigrp name
Device(config-router)# address-family ipv6 autonomous-system 3
Device(config-router-af)# af-interface GigabitEthernet1/1
Device(config-router-af-interface)# bfd
Device(config-router-af-interface)# end
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