--- On Thu, 3/29/12, Brian R. Watters <[email protected]> wrote: > From: Brian R. Watters <[email protected]> > Subject: Comcast Ethernet Feed > To: "NANOG list" <[email protected]> > Date: Thursday, March 29, 2012, 5:36 PM > We are about to accept a 20MEG > Ethernet feed via Comcast and their fiber plant as well as a > BGP feed across the same link. > > I have a space GIGE interface on a 7206VXR and would like to > know best practice for deploying for optimal performance > across this interface. > > Any ideas and or direction would be extremely helpful as we > are seeing some real issues such as. > > Direct connect (without BGP) to the CPE from Comcast (Fiber > to Ethernet) via a laptop gives the level of performance we > would expect, However as soon as we terminate to our router > via the GIGE which is set to 100MB full duplex and all flow > control turned off (Negotiation auto) per Comcast and > connect up via a 100MB fast Ethernet interface directly > connected we get a fraction of the speed when direct > connected. > > Ideas? > > > BRW >
A couple of questions - 1) What flavor of NPE are you using? 2) Is the GigE interface on the NPE-G1/G2 OR is this a PA? 3) Is the FaE ethernet interface that you appear to be connecting your laptop to, on a separate PA in chassis? 4) Have you verified you that "bandwidth-points" have not been exceeded for bus-1 and/or 2: slots 1,3,5 for bus1 and 2,4,6; also 0(if I/O controller is present. It is 600 points for bus1 and 600 for bus2. (A sh ver will provice the info) You can google: "Cisco 7200 Series Port Adapter Hardware Configuration Guidelines" for additional info. Finally, Have you *hard-coded* speed and duplex on any of you eth ints? Please don't! Let both ints auto-negotiate speed&duplex. after having done so, post the output of: sh int gi x/y and sh int fa x/y (hardcoding speed/duplex is sometimes required when dealing with brain-dead CPE. I have also seen other flavors of brain-dead CPE that *only* work when speed/duplex are set to auto) ./Randy
