Bug ID 439854: Reverting a GTM monitored LTM from 11.x to 10.2 might mark down some virtual servers

Last Modified: Apr 10, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP GTM, Install/Upgrade(all modules)

Known Affected Versions:
11.0.0, 11.1.0, 11.2.0, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4

Fixed In:
11.6.0, 11.5.1 HF5, 11.4.1 HF4, 11.3.0 HF9

Opened: Dec 05, 2013
Severity: 2-Critical
Related AskF5 Article:
K15251

Symptoms

Reverting a GTM monitored LTM from 11.x to 10.2 might mark down some virtual servers. When the GTM is upgraded to version 11.3.0, downgrading or rebooting the LTM to 10.2.4, results in some of the virtual servers remaining red (down). When a reboot occurs, the ltm-name field in the GTM configuration includes the folder name: /Common/vs.name.route.domain, and the LTM has been rolled back to a version in which folders were not supported, so the names do not match.

Impact

Because the ltm-name no longer matches, the virtual server is marked down. Furthermore, since the virtual server is not in the same route domain, a simple addr:port lookup fails and the virtual server's monitor request times out.

Conditions

This typically occurs when a virtual server is added in a software version that supports the folder structure that names virtual servers as follows: /Common/vs.name.route.domain.

Workaround

Prior to rolling the LTM back to 10.x, edit the configuration on the GTM and remove '/Common/' from the ltm-name fields of the monitored virtual servers.

Fix Information

An additional attempt is made to match virtual servers by addr:port, even if there is an LTM Name that does not match.

Behavior Change