Re: bandwidth aggregation between 2 hosts in the same subnet

Linux Advanced Routing and Traffic Control

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Grant Taylor schrieb:
> >I think it's not possible with the Cisco switches we use here to 
> >increase the bandwidth between 2 hosts on L2.
> 
> It sounds like a "per packet" or "per flow" decision that is defaulting 
> to "per flow" for deciding which port on an EtherChannel to use.
> 
> I'm not that much of a Cisco person so I can't say for sure, but I'd 
> think there would be a setting that could be changed in the switch that 
> would alter this so that you could get an aggregate bandwidth increase.
> 
> Doing a quick Google search 
> (http://www.google.com/search?hl=en&q=Cisco+CEF&btnG=Google+Search) 
> reminded me that we had to turn on Cisco Express Forwarding (a.k.a. CEF) 
> and set the CEF to be "per packet" rather than "per flow".  You might 
> want to do some research on your switches to see if they support CEF or 
> not.  If your switches do support it you may want to talk to your switch 
> support staff (if it is not your self) to see if they would consider 
> setting such up.

I've talked to one of the people of the network staff. He meant they
never used CEF in this type of scenario. I'm also not very familiar
with Cicso products.
 
> I am presently using CEF between a 3640 and an upstream 7204-ubr to load 
> balance ethernet connections (bridged to SDSL) and am getting an 
> aggregate bandwidth increase in "per packet" fashion.  So, this will 
> work between routers and I believe switches that support it.
> 
> Good luck.  Let me know if there is any thing else that I can do to help.

If you could give me more details on your CEF setup, that would maybe
help me to show them what a CEF config should look like.

But I'm still not sure if CEF is a thing that is designed to work with
client-client connections. 

Ralf
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