Bug ID 702520: Same AZ failover in AWS fails in some configurations with two or more objects sharing the same IP address.

Last Modified: Oct 06, 2020

Bug Tracker

Affected Product:  See more info
BIG-IP VE(all modules)

Known Affected Versions:
13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,

Fixed In:

Opened: Jan 18, 2018
Severity: 3-Major
Related AskF5 Article:


BIG-IP fails to reattach floating addresses to local interfaces during failover, when two or more objects are configured with the same IP address in a given traffic group. Failover fails with the following error in /var/log/ltm: err logger: /usr/libexec/aws/aws-failover-tgactive.sh (traffic-group-1): Failed to reassign some or all address(es): <IP address> <the same IP address> on interface <eni address>.


Failover will fail; some or all IP addresses will not be transferred to the active BIG-IP system.


-- AZ AWS failover. -- Same IP address is used for two or more virtual addresses, self IPs, NAT, SNAT translation. Note: Having two virtual servers with the same IP address (but different ports) does not cause the problem. Also, there is no conflict when using the same IP address for different traffic groups.


The only workaround is to change the configuration to use unique IP addresses for conflicting objects.

Fix Information

This issue has been resolved.

Behavior Change