[ovs-dev] TOS for BFD packets

Miguel Angel Ajo Pelayo majopela at redhat.com
Tue Oct 17 10:10:58 UTC 2017

That's a good point, I don't have experience with that (what's the best
DSCP class), but we should make sure BFD packet, as control/monitoring
traffic, is prioritised over other types of traffic.

On Tue, Oct 17, 2017 at 11:12 AM, Venkatesan Pradeep <
venkatesan.pradeep at ericsson.com> wrote:

> Hi Ben,
> The implementations I've worked on have used tos=0xC0 (DSCP CS6). Given
> that DSCP CS6 is recommended for network control traffic, and is used by
> OSPF, BGP etc., I think it is likely that many implementations do that for
> BFD too. Since BFD flaps have significant impact, marking BFD packets with
> the right DSCP value will allow the network to apply the right QoS for
> those packets and prevent BFD flaps due to network congestion.
> Regards,
> Pradeep
> -----Original Message-----
> From: Ben Pfaff [mailto:blp at ovn.org]
> Sent: Monday, October 16, 2017 11:13 PM
> To: Venkatesan Pradeep <venkatesan.pradeep at ericsson.com>
> Cc: ovs-dev at openvswitch.org
> Subject: Re: [ovs-dev] TOS for BFD packets
> On Mon, Oct 16, 2017 at 04:32:45PM +0000, Venkatesan Pradeep wrote:
> > BFD packets are being sent with tos = IPTOS_LOWDELAY |
> > IPTOS_THROUGHPUT which would put them in the best-effort class. It
> > would be better if we send with tos = IPTOS_PREC_INTERNETCONTROL so
> > that they can be appropriately prioritized in the network.
> Is that common practice for other BFD implementations?  If so, then I
> agree that OVS should follow it also.
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