Ethernet Products
Determine ramifications of Intel® Ethernet products and technologies
All support for Intel NUC 7 - 13 systems has transitioned to ASUS. Read latest update.
4757 Discussions

VM host bridging with SRIOV?


Hi there,

Running into an issue I think might be related to SRIOV not allowing mac addresses through to my bridge.

Dmesg shows me a lot of spoof events:

[29661.891939] igb 0000:1b:00.0: Spoof event(s) detected on VF 6

[29663.888911] igb 0000:1b:00.0: Spoof event(s) detected on VF 6

Hypervisor host has SRIOV enabled and is using Intel 82576 NIC's

Virtual Machine host has been configured with 2 x IOV NIC's

I want to be able to bridge the 2 NIC's together on the Virtual Machine but this doesn't work.

Only one side works at a time and the traffc never passes through the bridge

Could this be fixed with newer kernel or drivers?

I am using igbvf.ko version 2.0.1-k

Any help much appreciated

0 Kudos
2 Replies

This seems to be a popular topic of late, I think we had a similar question just last week.

You can't assign a VF to a bridge. By definition a bridge required the devices attached to it to be in promiscuous mode. A VF on the other hand sorts traffic based upon L2 filtering and cannot be placed into promiscuous mode, and therefore can't be used as a bridge.

Hope this helps.

- Patrick

0 Kudos


Thanks for the quick reply. I really appreciate it!!

So there is no way to make a VM with 2 SRIOV VF interfaces act as a bridge?

It works perfectly with Vswitches, but I really need the performance that SRIOV offers.

If there is a way that you can think of then I will try anything experimental etc.

I really need a VM running under KVM with high performance SRIOV bridged NIC's.

Looking to get as close to 10Gbps line speed as possible here


0 Kudos