- IPv6 Routing: EIGRP Support
- EIGRP MIB
- EIGRP MPLS VPN PE-CE Site of Origin
- EIGRP Support for Route Map Filtering
- EIGRP/SAF HMAC-SHA-256 Authentication
- EIGRP Wide Metrics
- EIGRP
- EIGRP IPv6 VRF-Lite
- EIGRP Stub Routing
- IP EIGRP Route Authentication
- Configuring EIGRP
- Add Path Support in EIGRP
- BFD Support for EIGRP IPv6
- EIGRP Classic to Named Mode Conversion
- EIGRP IPv6 NSF/GR
- EIGRP Loop-Free Alternate Fast Reroute
- EIGRP Support for 6PE/6VPE
- EIGRP Route Tag Enhancements
- Finding Feature Information
- Prerequisites for BFD Support for EIGRP IPv6
- Restrictions for BFD Support for EIGRP IPv6
- Information About BFD Support for EIGRP IPv6
- How to Configure BFD Support for EIGRP IPv6
- Configuration Examples for BFD Support for EIGRP IPv6
- Additional References
- Feature Information for BFD Support for EIGRP IPv6
BFD Support for EIGRP IPv6
The BFD Support for EIGRP IPv6 feature provides Bidirectional Forwarding Detection (BFD) support for Enhanced Interior Gateway Routing Protocol (EIGRP) IPv6 sessions, thereby facilitating 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, and network administrators use BFD to detect forwarding path failures at a uniform rate and not at variable rates for different routing protocol ‘Hello’ mechanisms. 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.
- Finding Feature Information
- Prerequisites for BFD Support for EIGRP IPv6
- Restrictions for BFD Support for EIGRP IPv6
- Information About BFD Support for EIGRP IPv6
- How to Configure BFD Support for EIGRP IPv6
- Configuration Examples for BFD Support for EIGRP IPv6
- Additional References
- Feature Information for BFD Support for EIGRP IPv6
Finding Feature Information
Your software release may not support all the features documented in this module. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Prerequisites for BFD Support for EIGRP IPv6
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 abovementioned modes.
Restrictions for BFD Support for EIGRP IPv6
Information About BFD Support for EIGRP IPv6
BFD for EIGRP IPv6
Bidirectional Forwarding Detection (BFD) is a detection protocol that provides fast-forwarding, path-failure detection for all media types, encapsulations, topologies, and routing protocols. The BFD Support for EIGRP IPv6 feature enables BFD to interact with the Enhanced Interior Gateway Routing Protocol (EIGRP) to create BFDv6 sessions between EIGRP neighbors. In a BFD-enabled EIGRP IPv6 session, BFD constantly monitors the forwarding path (from a local device to a neighboring device) and provides consistent failure detection at a uniform rate. Because failure detection happens at a uniform rate and not at variable rates, network profiling and planning is easier, and the reconvergence time remains consistent and predictable.
BFD is implemented in EIGRP at multiple levels; it can be implemented per interface or on all interfaces. When BFD is enabled on a specific interface, all peer relationships formed through the EIGRP “Hello” mechanism on that interface are registered with the BFD process. Subsequently, BFD establishes a session with each of the peers in the EIGRP topology and notifies EIGRP through a callback mechanism of any change in the state of any peer. When a peer is lost, BFD sends a “peer down” notification to EIGRP, and EIGRP unregisters a peer from BFD. BFD does not send a “peer up” notification to EIGRP when the peer is up because BFD now has no knowledge of the state of the peer. This behavior prevents rapid neighbor bouncing and repetitive route computations. The EIGRP “Hello” mechanism will later allow peer rediscovery and reregistration with the BFD process.
How to Configure BFD Support for EIGRP IPv6
Configuring BFD Support on All Interfaces
1.
enable
2.
configure
terminal
3.
ipv6
unicast-routing
4.
interface type number
5.
ipv6
address
ipv6-address/prefix-length
6.
bfd
interval
milliseconds
min_rx
milliseconds
multiplier
interval-multiplier
7.
exit
8.
router
eigrp
virtual-name
9.
address-family
ipv6
autonomous-system as-number
10.
eigrp router-id ip-address
11.
af-interface default
12.
bfd
13.
end
14.
show
eigrp
address-family
ipv6
neighbors
DETAILED STEPS
Configuring BFD Support on an Interface
1.
enable
2.
configure
terminal
3.
ipv6
unicast-routing
4.
interface type number
5.
ipv6
address
ipv6-address
/prefix-length
6.
bfd
interval
milliseconds
min_rx
milliseconds
multiplier
interval-multiplier
7.
exit
8.
router
eigrp
virtual-name
9.
address-family
ipv6
autonomous-system as-number
10.
eigrp router-id ip-address
11.
af-interface
interface-type interface-number
12.
bfd
13.
end
14.
show
eigrp
address-family
ipv6
neighbors
DETAILED STEPS
Configuration Examples for BFD Support for EIGRP IPv6
Example: Configuring BFD Support on All Interfaces
Device(config)# ipv6 unicast-routing Device(config)# interface GigabitEthernet0/0/1 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
Example: Configuring BFD Support on an Interface
Device(config)# ipv6 unicast-routing Device(config)# GigabitEthernet0/0/1 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 GigabitEthernet0/0/1 Device(config-router-af-interface)# bfd Device(config-router-af-interface)# end
Additional References
Related Documents
Related Topic |
Document Title |
---|---|
Cisco IOS commands |
|
BFD commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples. |
|
EIGRP commands: complete command syntax, command mode, command history, defaults, usage guidelines, and examples. |
|
Configuring EIGRP |
“Configuring EIGRP” chapter in IP Routing: EIGRP Configuration Guide |
Technical Assistance
Description |
Link |
---|---|
The Cisco Support and Documentation website provides online resources to download documentation, software, and tools. Use these resources to install and configure the software and to troubleshoot and resolve technical issues with Cisco products and technologies. Access to most tools on the Cisco Support and Documentation website requires a Cisco.com user ID and password. |
Feature Information for BFD Support for EIGRP IPv6
The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.
Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.
Feature Name |
Releases |
Feature Information |
---|---|---|
BFD Support for EIGRP IPv6 |
15.2(1)SY |
Bidirectional Forwarding Detection (BFD) is a detection protocol that provides fast-forwarding, path-failure detection for all media types, encapsulations, topologies, and routing protocols. BFD helps network administrators to ensure easier network profiling and planning and consistent and predictable reconvergence time. BFD interacts with Enhanced Interior Gateway Routing Protocol (EIGRP) to create sessions (IPv4 type sessions) between EIGRP neighbors for fast-forwarding, path-failure detections. Each session tests the forwarding path for a single route from a local router to a neighboring router. For any change in state (forwarding path goes down or forwarding path comes up) for any of the sessions, BFD notifies EIGRP of the new state for that route. Support has been added for EIGRP IPv6 neighbors to use BFD as a fall-over mechanism. The following commands were introduced or modified: bfd, show eigrp address-family neighbors, show eigrp address-family interfaces. |