[ovs-discuss] Quick acting bypass?

Lax Clarke lax.clarke at gmail.com
Fri Jun 3 21:02:38 UTC 2016


Is there a way to write OVS rules to act on BFD state (i.e., modify tables
based on BFD state) ?

On Thu, Jun 2, 2016 at 2:38 AM, Ben Pfaff <blp at ovn.org> wrote:

> On Thu, Jun 02, 2016 at 12:41:32AM -0400, Lax Clarke wrote:
> > Suppose we have two OVS switches A and B attached to two NICs
> respectively.
> > I have a VM in between that normally bridges traffic between A and B (and
> > thus bridges traffic ingressing on the NICs).
> >
> > Is there a way to set up a bypass mechanism, whereby switches A or B can
> > quickly determine that the VM is no longer bridging traffic, then cause a
> > bypass around the VM?
> >
> > Maybe some sort of heartbeats sent between the bridges that can detect
> > missing heartbeats on sub-10 seconds time frames?
>
> This sounds like a use for CFM or BFD.  OVS supports both, see
> ovs-vswitchd.conf.db(5).
>
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