[c-nsp] ASIC to switch port mapping

[Nick Hilliard]

On 13/09/2010 21:33, Benny Amorsen wrote:
> 3MB per PFE, according to:
> 
> http://www.juniper.net/us/en/local/pdf/implementation-guides/8010073-en.pdf

http://kb.juniper.net/KB10963

so, the 24 port model has 2 PFEs (i.e. 6M buffer space) and the 48, 3 PFEs
(9 meg).  That's not really very much, particularly the way that it's
divvied up.

> I'm not sure how much buffer the 3560 actually has, just that it isn't
> enough.

See a couple of postings back:

http://networking.ventrefamily.com/2010/09/3560ge-and-3750ge-buffers.html

quoth cisco: "these platforms [Catalyst 3560G/3750G and 3650-E/3750E ]
provide (minimally) 750 KB of receive buffers and (up to) 2 MB of transmit
buffers for each set of 4 ports".  Again, this looks like a simplification.

It would help enormously if Cisco were to publish clear and extensive
documentation as to how buffering on each of the 3560/3750 models actually
works.  Would anyone from Cisco on this list be able to oblige here?  Or if
its already published somewhere, could you point us in the right direction?

Nick