[c-nsp] IP SLAs - throughput measurement

[Adam Greene]

Oh, I get it now!

Thanks for explaining.

I'll try that out.

Adam

----- Original Message ----- 
From: "Bill Nash" <billn at billn.net>
To: "Adam Greene" <maillist at webjogger.net>
Cc: "Jee Kay" <jeekay at gmail.com>; <cisco-nsp at puck.nether.net>
Sent: Monday, December 18, 2006 1:37 PM
Subject: Re: [c-nsp] IP SLAs - throughput measurement


>
> He's talking about dueling gateways. With both boxes sending traffic to
> each other, all packets sent into the network are routed to each other in
> a cyclic loop, each packet living until its TTL is decremented to 0. You
> just keep feeding data into it until the volume gets to the level you
> want, and monitor for errors. Stop sending new data, and the load will
> slowly drop as TTLs expire.
>
> - billn
>
> On Mon, 18 Dec 2006, Adam Greene wrote:
>
>> Ras,
>>
>> Thanks for the advice. I'm going to show my ignorance here. I'm not quite
>> sure how that will multiply the traffic load by ~255. I assume you are 
>> not
>> saying that I could generate a single ~3.92Mbps traffic stream from PC to
>> PC, and the fact that the switches are routing to each other will cause 
>> them
>> to route the traffic on all 255 IP's in the /24, thus multiplying the
>> inter-switch traffic to 1Gbps. There must be something I'm not getting 
>> here.
>>
>> Would you mind elaborating a bit more for me? I'd like to understand your
>> method better, if possible.
>>
>> Thanks,
>> Adam
>>
>> ----- Original Message ----- 
>> From: "Jee Kay" <jeekay at gmail.com>
>> To: "Adam Greene" <maillist at webjogger.net>
>> Cc: <cisco-nsp at puck.nether.net>
>> Sent: Monday, December 18, 2006 11:49 AM
>> Subject: Re: [c-nsp] IP SLAs - throughput measurement
>>
>>
>> > My usual method of this is mgen and L3 on the switches.
>> >
>> > Basically, bring up L3 on the switches and set the default routes
>> > (assuming they're not already doing L3.. otherwise chose some
>> > 192.0.2/24 address space) to point at each other. This nicely
>> > multiplies your traffic load by ~255 (assuming default TTLs).
>> >
>> > Then point mgen (or iperf if you like) at the switch L3 and watch the
>> > error counters :) If they're all zero (no overruns, no drops) then
>> > you're good.
>> >
>> > Ras
>> >
>>
>>
>>
>>
>>
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>
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