Bug ID 640395: When upgrading from 10.x to a version that supports spanning VIPs, the virtual address spanning property may not be set properly

Last Modified: Sep 29, 2022

Bug Tracker

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

Known Affected Versions:
12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,,,,,, 12.1.4,, 12.1.5,,,, 12.1.6, 13.0.0, 13.0.0 HF1, 13.0.0 HF2, 13.0.0 HF3, 13.0.1, 13.1.0,,,,,,,,, 13.1.1,,,,, 13.1.3,,,,,,, 13.1.4,, 13.1.5,, 14.0.0,,,,,, 14.0.1,

Opened: Jan 19, 2017
Severity: 3-Major
Related AskF5 Article:


When upgrading from 10.x to version 12.1.0 or later, a network virtual address that had ARP disabled will not have spanning automatically enabled.


If you are not actually using the spanning feature, there is no impact. If you are using the spanning feature, it will no longer work until it is explicitly enabled. This can result in the loss of traffic, as the upstream router will be sending packets to standby systems that will now refuse to process that traffic.


Upgrading from 10.x to 12.1.0 or later. Must have a network virtual address configured with ARP disabled when upgrading.


Upgrade to an intermediate version that implements the explicit ICMP-Echo setting for virtual addresses (e.g. 11.x) and then upgrade to the desired version. Alternatively, you can manually set the spanning property on their virtual addresses as desired (after the upgrade).

Fix Information


Behavior Change