[j-nsp] Verifying Juniper ECMP

[gaurav goel]

hi ,
     As per my knowledge, In present condition , Whenever you will remove
or add any link or logical link in Ex router , it will rehash again and
flow is always expected to move. They have not implementation of consistant
hashing in Ex-series. but in new releases of s/w for Mx series, they had
implemented consistant hashing  feature. Where if one of link goes down
still other flow in other links will be impacted.
And regarding to flow, where exactly it is taking path, I have a suggestion
,
If you apply firewall filter for appropriate source address for counting
that, you can found out for where it it going.

Regards
Gaurav goel


On Sat, Aug 9, 2014 at 10:04 PM, ryanL <ryan.landry at gmail.com> wrote:

> yeah, see my follow up. got a little excited...
>
>
> On Sat, Aug 9, 2014 at 9:34 AM, <sthaug at nethelp.no> wrote:
>
> > > i've done exhaustive packet captures for juniper on this, thinking that
> > > somehow the EX was actually duplicating a packet incorrectly out one
> > > interface. but this stateless ECMP rehash for all flows every time a
> new
> > > flow is added or taken away makes a lot more sense to me, and also
> really
> > > sucks if true.
> >
> > "stateless ECMP rehash for all flows every time a new link (not flow)
> > is added or taken away" is *exactly* what I would expect (and want) to
> > happen. How do you expect ECMP to work in the presence of links added
> > or removed?
> >
> > Steinar Haug, Nethelp consulting, sthaug at nethelp.no
> >
> >
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