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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 19 Configuring Bidirectional Forwarding Detection
Configuring BFD
Note Cisco ASR 901 supports BFD echo mode.
BFD Configuration Guidelines and Restrictions
• The minimum time interval supported for BFD is 50 ms.
• The maximum number of stable sessions supported for BFD with 50 ms interval is 4.
• When you configure BFD and REP on Cisco ASR 901, REP protocol goes down.
• After enabling BFD on an interface, if you configure an IPV4 static route with BFD routing through
this interface, and if the IPV4 BFD session does not get established, unconfigure BFD on the given
interface, and configure it again. The BFD session comes up.
• When you move the BFD configuration saved in flash memory to the running configuration, BFD
session is re-established.
• When BFD is configured on a port from which more than 70% of line rate data traffic is egressing,
there is a drop in control packets including BFD packets. To avoid BFD packet drop, you have to
configure QoS policies that give higher priority for both CPU generated BFD packets and BFD echo
reply packets.
Configuring BFD for OSPF
This section describes how to configure BFD on the Cisco ASR 901.
Configuring BFD for OSPF on One of More Interfaces
Complete these steps to configure BFD for OSPF on a single interface.
Command 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(config)# interface vlan1
Router(config-if)#
Specifies an interface to configure.
Step 4
Router(config-if)# ip ospf bfd
Enables BFD for OSPF on the interface.