[c-nsp] Load-balancing

[Rodney Dunn]

On Mon, Jun 18, 2007 at 04:52:33PM -0400, Julio Arruda wrote:
> Rodney,
> 
> I understand there is already some l4 hashing in the etherchannel side 
> of the house ?

6k I know does it in hardware. I think the 4k does it too.


> So the feature you mention would add L4 hashing into what specific 
> platforms ?

It's the platform independent commit in to IOS. So any software forwarding
box that runs CEF.

 I assume it would be hardware dependent of course, but just 
> wondering :-)..

Nope. Platform independent as it's the software implementation.
If the platform doesn't support it it will not work in the hardware
forwarding path...so I guess you could say from that perspective it is
hardware dependent.

> 
> Rodney Dunn wrote:
> >144_(config-if)#ip load-sharing ?
> >  per-destination  Deterministic distribution
> >  per-packet       Random distribution
> >
> >CEF default isn't per destination it's a per src/dst hash.
> >
> >We've added the ability to hash on L4 ports too it's just
> >not shipping yet.
> >
> >Rodney
> >
> >On Mon, Jun 18, 2007 at 03:28:10PM -0400, Paul Stewart wrote:
> >>Hi there..
> >>
> >>We have a number of sites that are layer3 load balanced using OSPF or 
> >>static
> >>routing...
> >>
> >>For example:
> >>
> >>ip route 0.0.0.0 0.0.0.0 10.10.10.1
> >>ip route 0.0.0.0 0.0.0.0 10.10.10.2
> >>
> >>This doesn't provide for an equal bandwidth allocation although it works
> >>reasonable well...  with some of these connections now I'm looking for
> >>something that does "per packet" load balancing as some of these 
> >>connections
> >>have one soure and one destination therefore the "per destination" doesn't
> >>work well....
> >>
> >>What's the best route to take? (pardon the pun)
> >>
> >>Paul
> >>
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