Bug ID 852873: Proprietary Multicast PVST+ packets are forwarded instead of dropped

Last Modified: Nov 07, 2022

Bug Tracker

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

Known Affected Versions:
14.1.0,,,,,, 14.1.2,,,,,,, 15.1.0,

Fixed In:

Opened: Nov 25, 2019
Severity: 3-Major


Because the BIG-IP system does not recognize proprietary multicast MAC addresses such as PVST+ (01:00:0c:cc:cc:cd) and STP (01:80:c2:00:00:00), when STP is disabled the system does not drop those frames. Instead the system treats those as L2 multicast frames and forwards between 2 interfaces.


PVST+ (01:00:0c:cc:cc:cd), a proprietary multicast MAC is forwarded instead of discarded, even when STP is disabled.


-- STP disabled -- All platforms except 2000 series, 4000 series, i2000 series, i4000 series and i850.



Fix Information

Traffic with Destination MAC as PVST+ (01:00:0c:cc:cc:cd) or STP (01:80:c2:00:00:00) is sent to the BIG-IP system, egress traffic is monitored to check that MAC is dropped when either or both of the following db variables is enabled or vice-versa: bcm56xxd.rules.badpdu_drop bcm56xxd.rules.lldp_drop

Behavior Change