Last Modified: Apr 28, 2025
Affected Product(s):
BIG-IP All
Known Affected Versions:
10.2.1, 10.2.2, 10.2.3, 10.2.4, 11.0.0, 11.1.0, 11.2.0, 11.2.1, 11.3.0, 11.4.0, 11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8
Fixed In:
12.0.0, 11.6.1, 11.5.1 HF5, 11.2.1 HF15
Opened: Jul 08, 2014 Severity: 2-Critical Related Article:
K16019
When a vlan name is >= 16 characters including the /Common/ folder name prefix, the internal packet size will exceed the configured MTU size of 1582 on the MPI channel. This causes excessive IP fragmentation on tmm_bp vlan and high cpu usage. In some cases it can also cause packet loss.
This can cause excessive IP fragmentation on tmm_bp vlan and high cpu usage. In some cases it would also cause packet loss.
Vlan names (16 characters or longer) are being used. This length also counts the name of the partition.
Use shorter vlan names.
A new db variable vlan.backplane.mtu has been added to configure tmm_bp vlan mtu size, and the new default backplane MTU is set to to 1640.
A new db variable vlan.backplane.mtu has been added to configure tmm_bp vlan mtu size, and the new default backplane MTU is set to to 1640.