[ovs-dev] [PATCH v3] ovn: Support configuring the BFD params for the tunnel interfaces

[Miguel Angel Ajo Pelayo]

On Wed, Sep 26, 2018 at 11:08 PM Ben Pfaff <blp at ovn.org> wrote:

> On Wed, Sep 26, 2018 at 04:14:18PM +0530, nusiddiq at redhat.com wrote:
> > From: Numan Siddique <nusiddiq at redhat.com>
> >
> > With this commit the users can override the default values of
> > the BFD params - min_rx, min_tx, decay_min_rx and mult if desired.
> > This can be useful to debug any issues related to BFD, like BFD
> > state changes seen frequently.
> >
> > ovn-controller checks for the options 'ovn-bfd-min-rx',
> > 'ovn-bfd-min-tx', 'ovn-bfd-decay-min-rx' and 'ovn-bfd-mult' in the
> > external-ids of OpenvSwitch table row and configures these BFD
> > values to the tunnel interfaces.
> >
> > Signed-off-by: Numan Siddique <nusiddiq at redhat.com>
>
> Thanks for working to make OVN better.
>
> If this is primarily a debugging interface, would it be better to use
> ovs-appctl commands to adjust these values?
>
>
For both purposes, customers with a busy or high latency network may
eventually have issues with the defaults, for example, experiencing split
brain situations: 2 chassis fighting for a router because they believe they
are master (can't contact each other, but can contact a set of hypervisor
chassis).

If this has uses outside of debugging, would it be better to make the
> settings centrally configurable instead of via a local-only interface?
>

This is a good question, and IMHO it would be better to make it centrally
configurable. Numan, what do you think?


>
> Thanks,
>
>
Thank you Ben!,


> Ben.
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>


-- 
Miguel Ángel Ajo
OSP / Networking DFG, OVN Squad Engineering