Last Modified: May 05, 2025
Affected Product(s):
F5OS F5OS-C
Known Affected Versions:
F5OS-C 1.6.2
Fixed In:
F5OS-C 1.8.0
Opened: Sep 13, 2024 Severity: 3-Major
Jumbo frames with an IP total length greater than 9174 bytes are dropped when traversing the VELOS inter-blade backplane.
Data transfers between a VELOS tenant and another host configured with the same MTU may be disrupted. Individual packets may be dropped, or some flows may be permanently dropped.
This issue may occur for VELOS tenants with a VLAN MTU set to 9175 or higher.
Do not set the VLAN MTU higher than 9174 on a VELOS tenant.
The MTU limit of the inter-blade backplane has been increased to align with the maximum supported size of jumbo frames, ensuring that jumbo frame communication is reliably transmitted without packet drops.