Last Modified: Jul 12, 2023
Affected Product(s):
BIG-IP LTM
Known Affected Versions:
11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1
Fixed In:
11.5.0
Opened: Sep 04, 2013 Severity: 3-Major Related Article:
K15141
Bridging traffic between two interfaces on a child VLAN in vlangroups mode may be disrupted when there are packets arriving on another child vlan of the same vlangroup that create conflicting FDB entries.
In active mode, the 2x00 and 4x00 boxes will preferentially bridge over the vlangroup rather than to another port on the child vlan. In standby mode, this remains true, but the frame gets dropped unless we are set to bridge in standby.
For this to happen, there usually has to be an unresolved loop in your network.
It is inadvisable to use the 2x00 and 4x00 platforms as a switch/bridge at this point. Having no hardware support the switching happens in software at a higher latency and CPU cost.
For translucent vlan groups, allow standby 2x00/4x00 in ha pair to use local vlan FDB entry for bridging the traffic between two interfaces on a child vlan in the given vlan group.