Re: [nsp] CEF stability

From: Neil J. McRae (neil@COLT.NET)
Date: Mon Jan 24 2000 - 11:03:20 EST


On Mon, 24 Jan 2000 10:06:01 -0500 (EST)
 Tony Tauber <ttauber@bbnplanet.com> wrote:

> The other problem we've seen is input ignores when SRAM on
> the VIPs isn't that high (2MB) and there's lots of traffic
> bound for one or two busy output pipes (like the normal aggregation
> box) with high numbers of input interfaces (like a box loaded with
> CT3s). Due to the way the buffers are carved, any given channel on
> the CT3 gets not too much memory.
> Watch out for VIP2-40s (can't carry more than 2MB) or cards
> based on them like the CT3IP (vs. PA-MC-T3 with a VIP2-50).
> Looks like upping the SRAM to 4 or 8MB works much better.

We've seen that on ATM PA-A3's with lots of sub interfaces,
the solution was to lower the MTU. Although remember not
to change the MTU on a live box.

Regards,
Neil.

--
Neil J. McRae                             C O L T  I N T E R N E T
neil@COLT.NET



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