How to enable ECMP flow based forwarding ?

Scott Larson stl at
Tue Feb 14 18:23:39 UTC 2017

     I'm successfully using ECMP on 11.0-RELEASE firewalls, but in my case
they're also using OSPF with a pair of upstream MX480 routers via Quagga.
BIRD would be nicer to work with but the last time I checked it wasn't
playing nice with ECMP on FreeBSD. Regardless, if OSPF is an option you can
pursue that will definitely work.

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On Mon, Feb 13, 2017 at 4:23 PM, Olivier Cochard-Labbé <olivier at>

> Hi,
> I'm testing FreeBSD ECMP behavior by adding "options RADIX_MPATH" to my
> kernel configuration (11-stable).
> Now I can configure two identical routes toward 2 different next-hop: First
> step achieved :-)
> But it uses only the first entry and never uses the second one.
> I've tried to shutdown the first next-hop router (then no more arp-reply
> from this next-hop): But the ECMP FreeBSD router sticks to its first route
> entry and never try the second entry :-(
> Is there something else to enable (like RSS?) for having a real ECMP flow
> based router ?
> Thanks,
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