Re: [Bridge] Bridge - vlan - bond

["Nicolas de Pesloüan" <nicolas.2p.debian@free.fr>]

Sander Klein wrote:
> Hi,
> 
>> Can you please also describe what you try to achieve, and not only your
>> setup ?
>>
>> What are the expected effects ?
> 
> Sorry, I will. What I am trying to achieve is high availability. The host
> I'm building this on will be a kvm host with virtual machines which runs
> the images from a nfsmount. I need to have multiple vlans on this host
> which are then bridged to the virtual machines. What I want is that if the
> switch connected to eth0 fails, all traffic will go through eth1. The final
> setup will be the following:
> 
> +------+   +------+
> | core |---|blade |   +-----+
> |switch|   |switch|---|eth0 |
> +------+   +------+   |     |
>    |                  |Host |
> +------+   +------+   |     |
> | core |---|blade |---|eth1 |
> |switch|   |switch|   +-----+
> +------+   +------+
> 
>> Your bonding setup (active-backup) will lead to one port enabled and one
>> disabled.
> 
> That's okay with me. I don't need the speed, only the redundancy. I could
> use alb or tlb but since I'm testing right now active-backup it easier.
> 
>> Why don't you simply use eth0.101 and eth1.101 as two ports of br101,
> and
>> enable stp ?
> 
> Since the switches that connect to eth0 and eth1 have a crappy stp
> implementation (its a supermicro blade chassis) it's pain to get it
> working. Moreover, converging with stp is a bit slow. Bonding will do this
> in 100ms or faster while stp might take 30 seconds or so.

If stp is a problem, you can try the rstp user-space implementation.
> 
> The setup works perfectly as long as I don't use bridging. But I need the
> bridging to get the network to the virtual machines.

You should consider using a VM software that does not require bridge to get the network to the VM 
:-) (VirtualBox for example).

Anyway, if we assume br101 is "duplicating" this packet in some way, let's try and figure out why.

Can you please provide the output of the following commands:

ip addr
brctl show
brctl showmacs br101
cat /proc/net/bonding/bond0

	Nicolas.