Configuring Bidirectional Forwarding Detection - Cisco ASR 9000 Series Configuration Manual

MLDP Loop-Free Alternative Fast Reroute
Command or Action
Step 10
fast-reroute per-prefix
Example:
RP/0/RSP0/CPU0:router(config-isis-if-af)#
fast-reroute per-prefix
Step 11
interfaceGigabitEthernet0/0/1/7
Example:
RP/0/RSP0/CPU0:router(config-isis-af)#
interface GigabitEthernet0/0/1/7
Step 12
commit

Configuring Bidirectional Forwarding Detection

When a local interface is down, that is, due to either a fiber cut or because of interface shutdown configuration
is run, it can take a long delay in the order of tens of milliseconds for the remote peer to detect the link
disconnection; so, to quickly detect the remote shut on physical port or on bundle interfaces, the physical port
and bundle interfaces must be running Bidirectional Forwarding Detection (BFD) to ensure faster failure
detection.
Cisco ASR 9000 Series Aggregation Services Router Multicast Configuration Guide, Release 6.0.x
136
Implementing Layer-3 Multicast Routing on Cisco IOS XR Software
Purpose
Enables LFA FRR.
Enters the interface submode.