We have the same needs about STP (virtualize network as real as it gets), to
simulate network topologies we'd like to use in production. The main
goal is to eradicate any SPOF. So is it possible to attach a VM with a
bonding linked to two differents vswitch linked together to
prevent/simulate failure of one vswitch? This will certainly make a
loop, in real life STP will cope that problem, how about openvswitch?

For the HA problem, on the physical side, we have a central server
hosting a vswitchd hub linked to other vswitchd using GRE tunnels.
This host is clearly a SPOF. If this host has a major failure, is it
possible to swap/migrate  to an other (backup/slave) host the IP used
by the other GRE tunnels to contact this vswitch hub? As we do with
other services using keepalive/VIP/VRRP.
What are your recommandations to prevent failure of the vswitchd host?
May be a network topology with a central hub/vswitch is not a so good
idea, but what are the other choices? Is it possible to make a mesh
network without any SPOF with openvswitch? How to interconnect
different hypervisors?

(sorry Ben, I forgot to send this message to the ML)

-- 
Edouard Bourguignon
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