BFD for RIPv2 Support

The BFD for RIPv2 Support feature is used to facilitate an alternate path selection when a neighboring router is inactive.

Routing Information Protocol (RIP) uses the timeout of prefixes of a particular neighbor to identify if a neighbor is inactive. By default, the timeout is 180 seconds; that is, although the next-hop router is inactive, the RIP router will still broadcast prefixes for up to 180 seconds.

Bidirectional Forward Detection (BFD) is a protocol that provides subsecond failure detection using a single, common standardized mechanism that is independent of media and routing protocols.

Prerequisites for BFD for RIPv2 Support

BFD is independent of RIPv2 and must be enabled and functional on the router.

How to Configure BFD for RIPv2 Support Feature

Configuring BFD on RIPv2 Neighbors

Perform this task to configure BFD on RIPv2 neighbors:

SUMMARY STEPS

  1. enable
  2. configure terminal
  3. router rip
  4. bfd all-interfaces
  5. end

DETAILED STEPS

  Command or Action Purpose

Step 1

enable

Example:


Router> enable

Enables privileged EXEC mode.

  • Enter your password if prompted.

Step 2

configure terminal

Example:


Router# configure terminal

Enters global configuration mode.

Step 3

router rip

Example:


Router(config)# router rip

Configures the RIP routing process and enters router configuration mode.

Step 4

bfd all-interfaces

Example:


Router(config-router)# bfd all-interfaces

Enables BFD on all interfaces associated with the routing process.

  • RIPv2 registers with BFD and creates sessions for the neighbor when RIP updates are received. New neighbors are automatically enabled for BFD when the update packets are received.

Note

 

Alternatively, you can use the neighbor ip-address bfd command to enable BFD for a specific RIP neighbor.

Step 5

end

Example:


Router(config-router)# end

Exits router configuration mode and returns to global configuration mode.

Configuration Example for BFD for RIPv2 Support Feature

Example Configuring BFD for a RIPv2 Neighbor

The following example shows how to configure BFD for all interfaces associated with a RIPv2 neighbor: 


!
interface GigabitEthernet 0/0/0
 ip address 10.10.10.1 255.255.255.0
 bfd interval 50 min_rx 50 multiplier 5
end
!
interface GigabitEthernet 0/0/1
 ip address 10.10.20.1 255.255.255.0
 bfd interval 50 min_rx 50 multiplier 5
end
!
router rip
 version 2
 redistribute connected
 network 10.0.0.0
 neighbor 10.10.20.2 bfd
 bfd all-interfaces
 no auto-summary
!

Additional References

Related Documents

Related Topic

Document Title

Cisco IOS IP Routing: Protocol-Independent Commands

Cisco IOS IP Routing: Protocol-Independent Command Reference

Standards

Standard

Title

None

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MIBs

MIB

MIBs Link

None

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RFCs

RFC

Title

None

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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.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for BFD for RIPv2 Support

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.
Table 1. Feature Information for BFD for RIPv2 Support

Feature Name

Releases

Feature Information

BFD for RIPv2 Support

Cisco IOS XE Release 3.3

The BFD for RIPv2 Support feature is used to facilitate alternate path selection when a neighboring router is inactive.

The following commands were introduced or modified: bfd all-interfaces, debug ip rip bfd events, neighbor (RIP), and show ip rip neighbor .