Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.2.1, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.1 HF10, 11.5.1 HF11, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4
Fixed In:
12.0.0, 11.6.0 HF5, 11.5.4, 11.4.1 HF9
Opened: Oct 16, 2014 Severity: 3-Major Related Article:
K16919
A standby-standby state can occur after a failback if there is a CRC disagreement between peers.
It's a site down situation as all the objects in the traffic group will become unreachable.
HA pair using auto failback. There must be a CRC disagreement between peers. The failback preferred system must have a lower traffic group score than its peers. NOTE: CRC disagreements may lead to other issues and the customer is strongly advised to sync the devices to remove the disagreement.
Sync devices to remove the CRC disagreement.
Ensure that the preferred system goes active after auto failback, even if its traffic group score is lower than that of its peers.