Bug ID 1123329: F5OS sends LLDP PDUs with an erroneous VLAN tag.

Last Modified: May 29, 2024

Affected Product(s):
F5OS F5OS(all modules)

Fixed In:
F5OS-C 1.6.0, F5OS-A 1.3.0

Opened: Jun 30, 2022

Severity: 3-Major

Symptoms

LLDP PDUs transmitted by rSeries and VELOS platforms are erroneously encapsulated with a VLAN tag (VLAN ID 1).

Impact

Since LLDP PDUs are expected to arrive as untagged frames, the peer switch may drop the frame. If so, it will not list the rSeries/VELOS device as an LLDP neighbor and it will not show any LLDP packets received on those interfaces.

Conditions

LLDP is enabled and the TLV advertisement state of interfaces is configured for "tx" or "txrx".

Workaround

N/A

Fix Information

With the fix, F5OS internally generates egress LLDP PDUs with the default VLAN tag 4095, which the hardware strips as the frame egresses, resulting in an untagged frame on the wire.

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips