[c-nsp] mpls and etherchannel

Adam Vitkovsky Adam.Vitkovsky at gamma.co.uk
Fri Apr 22 09:56:27 EDT 2016

> Lukas Tribus
> Sent: Thursday, April 21, 2016 1:17 PM
> > On 20/Apr/16 20:12, Lukas Tribus wrote:
> >
> >> If we would know the platform, we could tell you more, but
> >> generically speaking, ECMP doesn't behave any better or worse than
> port-channeling.
> >
> > Beg to differ on this one.
> >
> > We have converted some LACP links to native IP/MPLS to get ECMP
> > because of issues with some of the payload not being equally hashed
> > across the LACP member links.
> What I meant (with "generically speaking"), is that there is no reason for a
> box to differ in the load-balancing behavior just because of ECMP vs LACP,
> because the NP lookup to create the load balancing hash has the same exact
> cost (its not like LACP is a encapsulation so the NP has to look deeper into the
> packet).
> That doesn't mean all boxes use the same load balancing hash algorithm for
> ECMP and LACP, it just means that there is no reason this data plane load
> balancing algorithm has to differ between LACP and ECMP.
> I'm talking about the load-balancing hash here. Its obvious that ECMP can
> load-balance in all kinds of l3 topologies where as LACP only balances towards
> the same box.
> ASR9k is a platform that behaves the same from a load-balancing hash
> perspective with both ECMP and LACP afaik.
What parameters used for load-balancing actually depends on the case in which the bundle is used in.
For details please see:


        Adam Vitkovsky
        IP Engineer

T:      0333 006 5936
E:      Adam.Vitkovsky at gamma.co.uk
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