Bug ID 761356: Hyperv SR-IOV: MTU more than 1500 is not supported

Last Modified: Apr 17, 2024

Affected Product(s):
BIG-IP MA-VE(all modules)

Known Affected Versions:
15.0.0, 15.0.1, 15.0.1.1, 15.0.1.2, 15.0.1.3, 15.0.1.4, 15.1.0, 15.1.0.1, 15.1.0.2, 15.1.0.3, 15.1.0.4, 15.1.0.5, 15.1.1, 15.1.2, 15.1.2.1, 15.1.3, 15.1.3.1, 15.1.4, 15.1.4.1, 15.1.5, 15.1.5.1, 15.1.6, 15.1.6.1, 15.1.7, 15.1.8, 15.1.8.1, 15.1.8.2, 15.1.9, 15.1.9.1, 15.1.10, 15.1.10.2, 15.1.10.3, 15.1.10.4

Opened: Mar 15, 2019

Severity: 3-Major

Symptoms

Packet length observed (using tcpdump or any other tool) is 1514 bytes.

Impact

Jumbo frames do not work. Note: This is a limitation in the drivers themselves, and is not unique to BIG-IP systems. The same issue occurs if the MTU change is attempted from the Linux command line instead.

Conditions

1. Hyper-V SR-IOV NICs are in use on the BIG-IP system. 2. VLAN MTU is greater than 1500 on the BIG-IP system, and MTU is greater than 1500 on client and server NICs.

Workaround

None.

Fix Information

None

Behavior Change

Guides & references

K10134038: F5 Bug Tracker Filter Names and Tips