[nsp] 2000 ATM PVCs on Cisco 7200

[Kinczli Zoltán]

hello,

  According to the data sheet one can use PA-A3 for 4096 simultaneous sessions
but there are 1024 concurrent SARon the PA.

  For me it has been an open question for a while, if the 1024 concurrent SAR limit
would cause any headache...

  If all those 4096 VCs receive/send max ETH MTU size packs (1500B, 32 cell)
distributed equally in time, than we would need 4096VC*32Cell/VC*48B/Cell,
which results in over 6MB buffer requirement, to prevent the PA from dropping cells,
just because the SAR limitation...

  There is 4MB SDRAM on the PA-A3 and 512KB SSRAM per SAR (i guess per SAR chip, not per concurrent SAR function)

  Granted, the distribution is not always so equal, avg pack sizes are less than 1500B,
but still the PA-A6 might have to be considered, i guess!

  Or am i missing something?


rgds
 --zoltan

-----Original Message-----
From: Denny Reiter [mailto:denny at reiters.org]
Sent: Sunday, May 23, 2004 9:03 AM
To: p.gaspar at mobilkom.at
Cc: cisco-nsp at puck.nether.net
Subject: Re: [nsp] 2000 ATM PVCs on Cisco 7200


On Mon, May 17, 2004 at 04:12:09PM +0200, p.gaspar at mobilkom.at wrote:
> Hello,
> 
> I'd like to ask you guys, if you would recommend a Cisco 7200 with NPE-400
> for terminating 2000 PVCs on one ATM OC3 line. The PVCs do not generate much
> traffic, actually they will be used only for remote management access to
> 2000 devices speaking IP over ATM.
> 

Right now I have a 7206 with an NPE-300 that's terminating 3,871
PVCs on one OC3 and 1718 PVCs on a second OC3.  I think you'll be
fine.

-- 
Denny Reiter                               denny at reiters.org
So I don't hurt your feelings:        happydenny at reiters.org
Sometimes, there's just no subsitute for knowing what the hell you're doing.
_______________________________________________
cisco-nsp mailing list  cisco-nsp at puck.nether.net
https://puck.nether.net/mailman/listinfo/cisco-nsp
archive at http://puck.nether.net/pipermail/cisco-nsp/

Ez az üzenet és a hozzá kapcsolódó fájlok, tervezetek kizárólag a
Címzettnek szólnak, a bennük foglalt információk bizalmasak, melyek
titokban maradásához a Synergon Informatika Rt.-nek jogilag méltányolható
érdeke fuzodik. Amennyiben valamely hiba folytán Ön nem a címzettje ennek a
levélnek, kérjük, semmisítse meg, és értesítse az üzenet küldojét. Az
üzenet az elküldés elott vírusellenorzésen esett át, de a vírusmentességére
nincs semmilyen garancia, ezért kérjük, ellenorizze azt!

DISCLAIMER

This e-mail and any attached files are confidential and may be legally
privileged. The content of this e-mail is subject of efforts by Synergon to
maintain its confidentiality. Also this e-mail is intended for the sole use
of the individual or entity to whom it is addressed. If you are not the
addressee, and received this transmission in error please delete this
e-mail and notify its sender immediately. This e-mail message has been
checked for computer viruses but it could still be infected. Please test it
for viruses before use.