[c-nsp] Your opinions on router throughput

[David Freedman]

What about the PA-T3 cards ?

Dave.

Ted Mittelstaedt wrote:
> Hi David,
> 
>   Interesting post, I knew there was overhead but I didn't realize
> it was that much.  Although I disagree with the assertion that
> as many packets are that small.
> 
>   The PA-A3-T3 cards were used because they had them -
> question for you, Cisco PA HSSI cards are cheap and plentiful
> on the used market, as are Kentrox 1591 T3 ISDU's - would
> switching over to those reduce the overhead on a point-to-point DS3
> enough to bother with?
> 
> Ted
> 
> ----- Original Message ----- 
> From: "David Freedman" <david.freedman at uk.clara.net>
> To: <cisco-nsp at puck.nether.net>
> Sent: Friday, October 27, 2006 5:15 AM
> Subject: Re: [c-nsp] Your opinions on router throughput
> 
> 
>> > The PA-A3-T3 cards are
>> > on a point-to-point DS3 and were used instead of regular serial DS3
>> > cards because they had them around.
>> >
>>
>> You will also have to bear in mind the ATM overhead which will reduce
>> the effective throughput of this solution
>>
>> See this old nanog post for more information (assume that PLCP is
>> enabled by default)
>>
>> http://www.merit.edu/mail.archives/nanog/1997-03/msg00263.html
>>
>> I dont think much has changed here, unless the PA-A3 card has a way of
>> doing this better....
>>
>>
>> Dave.
>>
>>
>> > Both VXR's have NPE300 with 256MB of ram.  Both are running
>> > iBGP between themselves, and eBGP to the feeds and receiving a full
>> > BGP table from the feeds.  IOS is 12.2
>> >
>> > Right now everything is happy and there's no problems.  But, utilization
>> > on the feeds is nowhere near max.
>> >
>> > The question put to us was,
>> >
>> > Is there a chance of the NPE300's running out of horsepower
>> > as throughput on the setup increases to the maximum of each circuit?
> There
>> > are customers on the LAN side that could, if all bandwidth limiting
>> > was removed, saturate either the 10Mbt-burst-to-45Mbt, or the 30Mbt
> ethernet
>> > feed, or the 45Mbt interconnect between routers.
>> >
>> > I told them to try it and see what happens. :-)  That didn't go over
>> > very well.
>> >
>> > My gut is that this setup, while it may run utilization up past 60%
>> > at full bore, will pass muster.  Certainly the chassis of the 2 routers
>> > will, but I am unsure of the real-world expectations of an NPE300.
>> > (as opposed to the published specs)
>> >
>> > They are running ip cef.  They know that the NPE300 is
>> > obsolete but there is nothing in the newer IOS that they want.
>> >
>> > Comments and speculations welcome.
>> >
>> > Ted
>> >
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