[j-nsp] Limit on interfaces in bundle

Mark Tinka mark.tinka at seacom.mu
Fri Oct 30 12:20:58 EDT 2015

On 30/Oct/15 14:44, Michael Hare wrote:

> All-
> You are correct about ECMP, I encountered this 12+ months ago and forgot that specific details.  Mark said he put the whole AE bundle into per packet mode [on a short LAN hop], which can also cause reordering [not just the LSP] if used incorrectly.

We've been tracking this for a couple of months now (per-packet
spraying), and no issues to report, really.

The thing to remember is that if policing is done on a LAG interface,
without equal loading of traffic across all members of the link, you
would end up with a fraction of the throughput on that interface as
Junos equally applies the policer across all member links of the LAG.

With two member links, a bias of the hashing on one member means only
50% of the traffic gets through the policer. If three member links, 33%
of the traffic gets through, e.t.c.

So the per-packet mode has really helped here.


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