Configuring Bfd Under A Dynamic Routing Protocol Or Using A Static Route; Enabling Bfd On A Bgp Neighbor - Cisco ASR 9000 Series Routing Configuration Manual

Implementing BFD
• The maximum number of BFD sessions on VLANs in a bundle is 128. When using BFD with OSPF,

Configuring BFD Under a Dynamic Routing Protocol or Using a Static Route

Enabling BFD on a BGP Neighbor

BFD can be enabled per neighbor, or per interface. This task describes how to enable BFD for BGP on a
neighbor router. To enable BFD per interface, use the steps in the
Note BFD neighbor router configuration is supported for BGP only.
SUMMARY STEPS
1. configure
2. router bgp autonomous-system-number
3. bfd minimum-interval milliseconds
4. bfd multiplier multiplier
5. neighbor ip-address
6. remote-as autonomous-system-number
7. bfd fast-detect
8. commit
DETAILED STEPS
Command or Action
Step 1 configure
consider the following guidelines:
◦ BFD establishes sessions from a neighbor to a designated router (DR) or backup DR (BDR) only
when the neighbor state is full.
◦ BFD does not establish sessions between DR-Other neighbors (for example, when their OSPF
states are both 2-way).
Caution If you are using BFD with Unicast Reverse Path Forwarding (uRPF) on a particular
interface, then you need to use the echo disable command to disable echo mode on that
interface; otherwise, echo packets will be rejected. For more information, see the
Disabling Echo
use the [no] ipv4 verify unicast source reachable-via command in interface
configuration mode.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.3.x
Configuring BFD Under a Dynamic Routing Protocol or Using a Static Route
Mode. To enable or disable IPv4 uRPF checking on an IPv4 interface,
Enabling BFD for OSPF on an
Purpose
Interface.
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