On Fri, 18 Apr 2008, Arie Vayner (avayner) wrote: > The way the buses are built on the 7200 create a bandwidth bottle neck > for the PA slots. I would say 400M is the limit per bus (there are 2, > and the PAs are split between them). > You should be aware of the concept of bandwidth points with regards to > PA slots on 7200: > http://www.cisco.com/en/US/prod/collateral/routers/ps341/prod_presentati > on09186a008009184d.pdf > http://www.cisco.com/en/US/docs/routers/7200/configuration/7200_port_ada > pter_config_guidelines/3875In.html > > On NPE-G1/G2, the onboard (on the NPE) GigE ports are different, and are > not limited by this kind of configuration as they are wired directly to > the forwarding engine. > There is also another exception for adding another PA slot on NPE-G1/G2, > by using the Jacket Card: > http://www.cisco.com/en/US/docs/routers/7200/configuration/7200_port_ada > pter_config_guidelines/3875In.html#wp1100537
There is no mention that a PA-GE can be slotted into the Jacket card. Am I missing something? Thanks, Hank > http://www.cisco.com/en/US/prod/collateral/routers/ps341/prod_bulletin09 > 00aecd80471892.html > > Arie > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Hank Nussbacher > Sent: Friday, April 18, 2008 07:28 AM > To: Ross Vandegrift > Cc: [email protected] > Subject: Re: [c-nsp] NPE-G1 PPS limitations > > On Thu, 17 Apr 2008, Ross Vandegrift wrote: > >> On Thu, Apr 17, 2008 at 11:35:13AM -0700, [EMAIL PROTECTED] > wrote: >>> Would one expect gigE to gigE traffic local to the NPE-G1 to scale >>> higher than that? >> >> Yea, I would expect that. I don't understand all of the >> architechtural issues on the 7200 series in great detail, but it seems > >> that either the PCI bus that line cards use isn't really up to doing >> GigE, or the controllers on the PA-GE doesn't scale well. >> >> The router I saw this on originally had it's primary ingress interface > >> on the NPE and primary egress interface on the PA-GE. When we swapped > >> a low-traffic interface on the NPE with the PA-GE, we suddenly saw our > >> packet loss drop to nothing. So I can say with pretty much 100% >> confidence that local to the NPE will scale much better than the >> PA-GE. >> >> Ross > > Have others found this as well? So far we have used the builtin GE > ports on the G1 and have not seen problems. We are planning on adding a > 4th GE port via a PA-GE and had not seen any documentation about the > limitations you mention. > > Thanks, > Hank > _______________________________________________ > cisco-nsp mailing list [email protected] > https://puck.nether.net/mailman/listinfo/cisco-nsp > archive at http://puck.nether.net/pipermail/cisco-nsp/ > _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
