Bug ID 524301: BIG-IP VE does not support the jumbo frames with MTU set to 9001 on AWS.

Last Modified: Mar 21, 2019

Bug Tracker

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

Known Affected Versions:
11.4.1, 11.5.0, 11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 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, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3, 11.6.3.1, 11.6.3.2, 11.6.3.3, 11.6.3.4, 11.6.4, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4

Fixed In:
12.1.0

Opened: May 20, 2015
Severity: 3-Major
Related AskF5 Article:
K49282174

Symptoms

BIG-IP Virtual Edition (VE) running on Amazon AWS does not support the jumbo frames with MTU set to 9001. A smaller MSS is suggested in TCP connection's 3-way handshake.

Impact

Jumbo frame requests are not honored by BIG-IP VE.

Conditions

BIG-IP VE runs on some Amazon AWS instances with their NICs' MTU set to 9001 by default.

Workaround

Manually set the NICs' MTU to 9001 after it has been fully started.

Fix Information

Set up a dataplane interface's MTU up to 9198 with this fix. To make a VLAN and the interface from which it derives have the new MTU, run the command: tmsh modify net interface <ifname> mtu <mtu>.

Behavior Change