Hello,

I'm working on a H.A virtualization server (we virtualize asterisk pbx to be precise).

We have 6 interfaces on each nodes:

2 (eth0 - 1) are used for drbd's replication with a bond.

2 (eth2 - 3) for gateway bridge, one on each switches

2 (eth4 - 5) for cluster bond / management.

We had 2 vlan at first, one directly on internet (v5) and another one for management (v10) behind a firewall.

Now we have to add a new vlan (v7).

So i want to know if i can do the following:

eth4.10 and eth5.10 bound together for cluster and management.

eth4.7 and eth5.7 bridged together for VM's access in new vlan.

Do you think this is possible ?

You can bond eth4.10 and eth5.10 together for cluster and management. But for bridge, it request in same LAN. That means different VLAN didn't work.

Ok, so i can't have a bridge directly on a trunk.

What if my bridge doesn't have an ip and is only there to let VMs on the network ? Can i set a vlan in the VM then ?

Or i could bypass this by making a bond with eth4.7 eth5.7 then bridge that bond ?

Thanks a lot for your answers !

Why do you want to create a bridge on a bond interface, eth4.7 and eth5.7? Just bridge one interface? You could create a VLAN on the bond for VM access in new VLAN.

For redundancy, what if the switch on which that only one bridged interface is, has a failure ? The service will be interrupted which cannot be tolerated.

We have to bridge 2 interfaces, one on each switches.

I can use bond instead of bridge for vm connectivity with kvm-libvirt ?

I'll try this right away, thanks.

Bond interface can provide redundancy and load-balance. It is better than bridge.