[c-nsp] mpls and etherchannel

[Adam Vitkovsky]

> 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:
https://supportforums.cisco.com/document/111291/asr9000xr-loadbalancing-architecture-and-characteristics#L2



adam


        Adam Vitkovsky
        IP Engineer

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

This is an email from Gamma Telecom Ltd, trading as “Gamma”. The contents of this email are confidential to the ordinary user of the email address to which it was addressed. This email is not intended to create any legal relationship. No one else may place any reliance upon it, or copy or forward all or any of it in any form (unless otherwise notified). If you receive this email in error, please accept our apologies, we would be obliged if you would telephone our postmaster on +44 (0) 808 178 9652 or email postmaster at gamma.co.uk

Gamma Telecom Limited, a company incorporated in England and Wales, with limited liability, with registered number 04340834, and whose registered office is at 5 Fleet Place London EC4M 7RD and whose principal place of business is at Kings House, Kings Road West, Newbury, Berkshire, RG14 5BY.