[nsp] Load sharing over unequal bandwidth lines using CEF

Piotr Marecki p.marecki at tdcinternet.pl
Mon Jun 2 16:15:45 EDT 2003

----- Original Message -----
From: "Harold Ritter" <hritter at cisco.com>
To: "Earl Zmijewski" <eez at fluent.com>
Cc: <cisco-nsp at puck.nether.net>
Sent: Monday, June 02, 2003 2:30 PM
Subject: Re: [nsp] Load sharing over unequal bandwidth lines using CEF

> Earl,
> This is not CEF but routing protocol related. To do unequal cost path load
> balancing you need a routing protocol that supports it. Currently, Eigrp
> and BGP (Link bandwidth feature) support it.

When it comes to forwarding it is CEF related . If i am right , to
loadbalance CEF has internal data structure
of 16 entries and hashing function chooses one of the 16 entries per
flow/per packet.So unless hashing function isn't
something complicated you cant obtain all possible ratios .
Also one can do unequal load-balancing using TE tunnels.


Piotr Marecki

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