[j-nsp] ECMP on ERX

[Guy Davies]

Hi Sven,

While the balance is generally good, it's important to realise two things.

1. The balance will not be equal, it will approximate to equal.

2. Tthere are always ways of create a particular traffic profile that
can skew the hash and result in traffic that is significantly
unbalanced.  This is somewhat rare in production networks and
generally occurs when in the lab (e.g. using sources and destinations
all from a very small range of addresses is a common challenge).

If you are seeing a very unbalanced set of flows, then it's probably
worth describing the circumstances a little more.

Rgds,

Guy

On 20/09/2007, Sven Juergensen (KielNET) <s.juergensen at kielnet.de> wrote:
> Hi list,
>
> am i right in my understanding
> that if there are two routes
> towards a destination across
> different links, the JUNOSe
> defaults to hashed ECMP, which
> loadbalances traffic evenly
> over both links?
>
> Thanks and best regards,
>
> sven03
>
> Mit freundlichen Gruessen
>
> i. A. Sven Juergensen
>
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