[Openvpn-users] Re: STP and fully-connected mesh of bridges

[Patrick Cervicek <patrick@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx>]

Jean-Pierre Schwickerath schrieb:
> > > You can set a "path cost" for each link and if stp is indeed working
> > > it will find out by its own, that directly going from A to B is
> > > cheaper than first travelling to C. 
> > >
> > > Check the brctl manpage:
> > > brctl setpathcost <bridge> <port> <cost> sets the port cost of the
> > > port <port> to <cost>. This is a dimensionless metric.
> >
> > The problem then is, that all Traffic from A to C would then go over B
> > ...
>
>
> If you set the cost on each port on each host to 10, for example, then
> the bridges will find out on their own that they can reach the hosts
> directly. The cost from A to B will be 10 so as the cost from A to C
> will be 10. And that the cost from A to C when going over B is 20 and
> thus this link will not be used.

Are you sure that this would work? Normally STP selects only one path 
for all Layer2-traffic and disables the other link (just as it happend 
by the OP). If you want traffic to take the shortest path the OP should 
use a routed-vpn instead of a bridged-vpn.


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