[c-nsp] load sharing Vs load balancing

[Rodney Dunn]

On Mon, Nov 27, 2006 at 05:59:18PM +0100, Oliver Boehmer oboehmer" wrote:
> david.ponsdesserre at uk.bnpparibas.com <> wrote on Monday, November 27,
> 2006 5:36 PM:
> 
> > Hello again people .
> > 
> > I need to come up with a load balancing solution for one of our
> > customer . I have a question , may be it is a bit dumb but .... What
> > is the actual difference between load balancing and load sharing ?
> 
> Well, both terms usually mean the same thing: Some technology to split
> the load over multiple links.

I think what we agreed on a year or so ago was that load balancing
was more of a dynamic change in traffic to adjust for load.
ie: MLPPP, OER, etc..

Load sharing is a pre-deterministic form of distributing traffic
(per packet, CEF hash, etc...)

> 
> > We will be using mainly Cisco Kit with Ebgp between our Pes
> > and customers Ces  ( It is an Mpls connection )
> > If you have any best practices on load balancing
> > implementation other Ebgp please forward !!!
> 
> You might want to elaborate given the topology you have in mind, but in
> MPLS networks, you ususally need some form of BGP multipath to split the
> load. There are some standard scenarious:
>  
> 
>                   PE2 -- CE2 \
> CE1 --- PE1                   host
>                   PE3 -- CE3 /
> 
> you need iBGP multipath to have the traffic from CE1 to use both PE2-CE2
> and PE3-CE3 links.
> 
> If you have
> 
>      PE2 === CE2
> 
> you need eBGP multipath on the PE2 to use both links from PE2 to CE2
> (assuming you use BGP as PE-CE)
> 
> There is another method specific to MPLS-VPN: eiBGP multipath:
> 
>                   CE4
>                    |
>                    |
>                    |
>                   PE2 -- CE2 \
> CE1 --- PE1                   host
>                   PE3 -- CE3 /
> 
> 
> You need eiBGP multipath if you also want the traffic from CE4 to the
> host behind CE2/CE3 to use both the direct eBGP link via CE2, as well as
> the other link via PE3 to CE3.
> 
> Hope it helps..
> 
> 	oli
> 
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