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> This may be getting close to the issue.  I don't see any interfaces
> anything like that. I'm seeing two different types of bride states on
> my compute nodes, which suggest something's wrong there.  On the
> compute node hosting the 'bad' instances and many other nodes as well
> I see:
>
> bridge name    bridge id        STP enabled    interfaces
> br-int        0000.da8ae1f32b4f    no
> int-eth1-br
>                             tap217f1525-a7
>                             tap2216c86e-aa
>                             tap95f49c26-c5
>                             tap9cf1249f-19
>                             tapa35c07ef-ef
>                             tapdcc2d3c6-d6
>                             tapdebc0ece-86
>                             tapf1cf3384-6d
> br-tun        0000.f66f85d4f940    no
> eth1-br        0000.60eb69dc46df    no        eth1
>                             phy-eth1-br
> virbr0        8000.000000000000    yes
>
> But a minority of systems show:
>
> ovs-system        0000.6e7205af2054    no        br-int
>                             br-tun
>                             eth1
>                             eth1-br
>                             int-eth1-br
>                             phy-eth1-br
>                             tap0a7aca16-ad
>                             tap4ff9d951-c1
>                             tap4ffca4ce-00
>                             tap892a01b4-93
>                             tapf6ddeaf5-f4
> virbr0        8000.000000000000    yes
>

I hope I didn't throw a red herring at you. Are you using the
LibvirtHybridOVSBridgeDriver in nova.conf? If so, then you should see the
bridge structure I described.

Do you happen to be using ovs and brcompat?
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