Passport 15K - eng arc ov settings

[rainman]

Hello,

I'm responsible for maintaining a few Passport 7440 and 15K's, and I find myself having to increase the ConnectionPoolCapacity and the ProtectedConnectionPoolCapacity on the LP "eng arc ov" attributes. What are the defaults for these settings, and what is preferred? Should I just max them out to allow for the most connections?

Trying to find out whats the best method for configuration of these connection/protected-connection pools. Seems I'm always increasing them as I build out. Is there an automatic setting? Suggestions??


Thanks,

Rainman

 

[NTPeave]

Hi Rainman,
the answer to most of your questions is "depends what cards you're running". There's documentation to address just this topic.
Or alternatively, yes, just max out the per-port allocations to allow the most connections. This might be easiest to do by modifying your standard procedure for commissioning a new card to preconfigure it with, for example, all for ports on a 4pOC3/12 card with their respective ConnectionPoolCapacities. That will mean that you don't have to reload the card if you need to commission a new port.

Do you use spared ATMIF connections? If not, you don't need to set the protectedConnectionPoolCapacity (ProtConnCap) - just leave it at 0.

Do you want someone in this forum to suggest a set of values to use as your conncaps? That's potentially risky (for a number of reasons!) as it depends on the type of traffic you have. One network may have a small number of connections (each with large bandwidth) per port where, say, a 4pOC12 card is justified, but using a small conncap. Your network may have a huge number of small connections per port and require a larger conncap - what works on one network won't necessarily work on yours...

Having said that, if one card on your network has all ports in use and has been previously engineered correctly (by you, or a Nortel Engineer, or a previous worker, etc) then you can take its conncap of, say, Lp Eng Arc Ov = 12000 connections and distribute them per port: Lp Eng Arc Aqm/[0,1,2and3] = 3000 connections per port on new cards.

Most importantly, if you have a non-disclosure agreement with Nortel through your local reps, you should be able to get hold of the ATM Traffic Management Guideline document. [With PCR6.x it might have a new name] It has a section on engineering connection pools, and specifically Lp Eng Arc Ov Conncap (ConnectionPoolCapacity) related attributes. Sounds exactly like what you are after to me!
Good luck.