Re: TCP Window Optiimization with LFN.

It depends on what you are looking for: High BW, Latency issues or both.

For a large window size,
http://en.wikipedia.org/wiki/TCP_window_scale_option should do it. As long
as there are no CRC errors on the path, there is no much harm enabling it
by default.

For latency issues of chatty protocols, we will all have to wait for the
results of CERN experiments to see if we can send packets faster then the
speed of light... ;) . For some applications, WAAS "reducing" the latency
is much more important than BW.

HTH,
Dan #13685 (RS/Sec/SP)
 The CCIE troubleshooting blog: http://dans-net.com
 Bring order to your Private VLAN network: http://marathon-networks.com

On Thu, Aug 16, 2012 at 9:07 PM, JB Poplawski <jb.poplawski_at_gmail.com>wrote:

> Good afternoon,
>
> My token question out to the group as I await TAC.
>
> I have a network with Gb links between sites. Connected like such:
> Site A < 7ms > Site B < 71ms > Site C <9ms> Site D
>
> End to end latency between Site A and Site D is 69ms. My numbers above are
> the average given from CLI.
>
> I've been reading on LFNs (Long Fat Networks) and basically I need to
> optimize the TCP Window size (calculated to 8625KB).
>
> My question, where do I implement it?
> Site A and Site D? Or Site B and Site C?
>
> If I implement on Site B and Site C, how does that impact Site C to Site D,
> etc?
>
> Any ideas?
>
> We previously had MPLS connection with WAAS which optimized traffic. Now
> since we're running Gb, we removed WAAS (our WAAS boxes were only rated to
> 50Mbps).
>
> Any suggestions? Am I on the right path?
>
> Any help is greatly appreciated.
> JB
>
>
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Received on Thu Aug 16 2012 - 23:11:32 ART