You must reload the ASR 9000 Enhanced Ethernet Line Card after enabling BFD hardware offload mode.Note
BFD hardware offload supports seven timer intervals for BFD sessions. The minimum timer interval supported
is 3.3 milliseconds and maximum is 30 seconds. The number of BFD sessions supported vary by the timer
interval, as detailed below:
Sessions supported on
Network Processing Unit
Sessions supported on
Line Card
Timer IntervalBFD Session
3006003.3 millisecondsIPv4, IPv6, MPLS-TP
1000200015 millisecondsIPv4, IPv6
3000800050 millisecondsIPv4, IPv6
30008000300 millisecondsIPv4, IPv6
300080001 secondIPv4, IPv6
300080002 secondsIPv4, IPv6
3000800030 secondsIPv4, IPv6
Restrictions
•
Echo mode is not supported for hardware offloaded sessions.
•
Only seven timer intervals for BFD sessions are supported.
BFD Object Tracking
Object Tracking is enhanced to support BFD to track the reachability of remote IP addresses.This will enable
complete detection and HSRP switch over to happen within a time of less than one second as BFD can perform
the detection in the order of few milliseconds
How to Configure BFD
BFD Configuration Guidelines
Before you configure BFD, consider the following guidelines:
•
FRR/TE, FRR/IP, and FRR/LDP using BFD is supported on POS interfaces and Ethernet interfaces.
•
To establish a BFD neighbor in Cisco IOS XR software, BFD must either be configured under a dynamic
routing protocol, or using a static route.
Cisco ASR 9000 Series Aggregation Services Router Routing Configuration Guide, Release 5.1.x
196 OL-30423-03
Implementing BFD
BFD Object Tracking
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