You can use some openflow controller that listens for port status messages.
This messages contains port number up or down,Mac address.
On Oct 4, 2013 10:44 PM, "Phil Daws" <ux...@splatnix.net> wrote:

> Made huge headway with, RTFM, and have KVM running with vLANs.  Thanks to
> http://blog.scottlowe.org/ for great articles.
>
> Now wondering how one should monitor the ports on the vSwitch ? I admit
> have not check on the SNMP aspect, but from the articles above, am now
> wondering if I have gone down a rabbit hole by letting the KVM/libvirt
> processes manage the ports!  By defining a OvS network in KVM it provides
> great persistence when starting and stopping; but what does that do to SNMP
> with the OiDs it returns ? Would it be better to defined everything through
> a start-up script on the host for Bridges/Ports and vLans ?
>
> Amazing tech and learning so hope for any help.
>
> Thank you.
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> http://openvswitch.org/mailman/listinfo/discuss
>
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