[c-nsp] VS-S720-10G (6509 VSS Engine) 10G Port Issue

[Łukasz Bromirski]

On 2012-06-12 16:28, Xu Hu wrote:

> We bought VS-S720-10G engine for VSS in 6509, but now the customer don't
> want use the VSS mode, they just want to use that as normal engine.
> So now we are wondering if we use the 10G port for normal Layer2 or Layer3
> traffic, will it impact our engine performance or CPU utilization? Is there
> any detail document talking about this?

In reality, Sup720-10GE sold with the "VS" prefix is a
perfectly normal Supervisor. What is changed is that the
fabric matrix is actually 20x20Gbit/s not 18x20Gbit/s, so
you get additional 2 channels for 20Gbit/s.

The 19th fabric channel drives the uplink on the active Sup
and the 20th fabric channel drives the uplinks on the standby
Sup.

The "bonus" features for VSS among other things come from
the next-gen PFC card, PFC3C or PFC3CXL.

In terms of L2/L3 traffic processing, the job is always at
hand of PFC on the Supervisor, or the DFCs on the linecards.

The uplink ports on the Supervisor itself are "serviced" by
the PFC on the Supervisor itself, with the upper limit being
48Mpps for the PFC3.

> If ok, then by default, each engine will have two X2 port, so totally we
> will have four 10G port to use as normal data transmission?

Yes, and it's indeed default config when you get the VS-SUP720
from the factory - it's just a standalone Supervisor.

-- 
"There's no sense in being precise when |               Łukasz Bromirski
  you don't know what you're talking     |      jid:lbromirski at jabber.org
  about."               John von Neumann |    http://lukasz.bromirski.net