Re: [Xen-users] network setup with one bonded interface and one virtual interface

[Alexandre Kouznetsov <alk@xxxxxxxxxx>]

Hello.

El 11/10/12 12:48, Adam Gold escribió:
> I wanted to thank you for an extremely clear and helpful response.
Great it was useful!
It happened that I just have delivered a similar setup, so I had the 
examples at hand.
> I'm
> going to work through trying out your suggestions and I may – if you
> don't mind – revert with some additional questions if I have any.
Sure thing. Why don't you post them to the list?
You could get more feedback, and any answer will be indexed by search 
engines for future reference. In any case, I'll watch for it.
> Out
> of interest, if redundancy is the priority, which bond mode would you
> recommend?  From what I read here it seems active-backup is the
> way to go:
> http://www.linuxfoundation.org/collaborate/workgroups/networking/bonding
Can't tell for sure. I work with few bonded interfaces, so my knowledge 
is too theoretical. I picked up configurations based on than, made 
tests, they gave expected results, so I stayed there.
Check http://www.linuxhorizon.ro/bonding.html fro resumed reference.

My favorite is 802.3ad aka mode=4. It seems to be smart enough to 
balance the traffic and provides failover. If I unplug one cable, in the 
worst case I'll loose a few packets (TCP will easily correct that).
There are switches that clam they support 802.3ad, but in practice it 
turns they have a nonsense called "static LACP" (the standard implies 
that there is no 802.3ad without LACP). In that case I have successfully 
used balance-xor aka mode=2.
Never needed a pure failover without traffic balance. In case I needed 
that, I would choose between active-backup aka mode=1 and broadcast aka 
mode=3. The second one is more stupid, in the best sense of the word, so 
I can think of cases when it's preferable.
If you think of fault tolerance, consider that the bonding is frequently 
done with ports on the same switch. Unless you have a fine piece of 
equipment that supports fancy stacking, which could have different ports 
of the same bond on different switches. It your bond is on the same 
switch and the switch dies, so does the bond, forget your fault 
tolerance. So, you better imagine your scenarios (intentional unplug of 
cable while making movements, broken cable, dead Ethernet port, etc), 
test (simulate) them and decide if the behavior of your setup is 
acceptable or not.
Greetings.

--
Alexandre Kouznetsov


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