Bug ID 432492: IPv6 single-hop BFD sessions may fail to establish

Last Modified: Jul 13, 2024

Affected Product(s):
BIG-IP LTM(all modules)

Known Affected Versions:
11.0.0, 11.3.0, 11.4.0, 11.4.1

Fixed In:
11.5.0, 11.4.1 HF6

Opened: Oct 02, 2013

Severity: 1-Blocking

Related Article: K14962


When single-hop BFD session is configured with certain versions of Cisco or Juniper OS using IPv6 addresses, IPv6 BFD INIT packets sent from the BIG-IP system may be dropped by Cisco because the BIG-IP system sends these IPv6 packets with a recommended default hop limit of 64 instead of 255 as required by RFC 5881. Neighbor debug logs may show if this is the problem.


BFD sessions fail to establish.


This occurs when you configure BFD with IPv6 addresses for the BFD session with newer versions of Cisco or Juniper OS.


None for IPv6 addresses. BFD sessions using IPv4 addresses work correctly.

Fix Information

The BIG-IP system transmits IPv6 BFD for single-hop sessions with a hop limit value of 255.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips