[c-nsp] CEF720 and DCEF720 line cards

[Łukasz Bromirski]

On 2010-03-08 06:11, jack daniels wrote:

> 1) how to identitify if the card is CEF720 or DCEF720
> 2) in CEF720 if traffic(L2 or L3) is withing same port group of the ASIC
> will it go still go to PFC
> 3) in DCEF720 if traffic(L2 or L3) is withing same port group of the ASIC
> will it be hardware swithed by this ASIC only or will it go to PFC.

dCEF720 is a LC that has both the CEF720 architecture (20Gbit/s fabric
channel/channels) and a DFC onboard ('d').

So, a WS-X6724 is a CEF720-style card (1x20Gbit/s channel to fabric),
and with a DFC3 attached goes fully distributed - DFC3 local to the
card is responsible for all features normally PFC would do.

Without DFC, the CEF720-style card only benefit is the switch matrix
connectivity, all decisions are taken centrally by a PFC on the
Sup/RSP.

-- 
"Everything will be okay in the end.  |                 Łukasz Bromirski
  If it's not okay, it's not the end." |      http://lukasz.bromirski.net