[151752] in North American Network Operators' Group
Re: Comcast Ethernet Feed
daemon@ATHENA.MIT.EDU (Randy)
Thu Mar 29 22:33:44 2012
Date: Thu, 29 Mar 2012 19:32:58 -0700 (PDT)
From: Randy <randy_94108@yahoo.com>
To: "Brian R. Watters" <brwatters@absfoc.com>
In-Reply-To: <4884832.1249.1333072968959.JavaMail.root@mail.absfoc.com>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Never mind control and what Comcast says about hard-coding speed and duplex=
!
The question is:
What happens when you set the int facing Comcast CPE to auto?
Does the link even come up?
*IF* the link comes up, can you ping your next-hop?
If you can, leave auto-neg on despite what what Comcast may say/require.
Post a "sh int gix/y" and "sh int fax/y"
If the above outputs are *clean*, I would say a TAC case is called for.
--- On Thu, 3/29/12, Brian R. Watters <brwatters@absfoc.com> wrote:
> From: Brian R. Watters <brwatters@absfoc.com>
> Subject: Re: Comcast Ethernet Feed
> To: "Randy" <randy_94108@yahoo.com>
> Cc: "NANOG list" <nanog@nanog.org>
> Date: Thursday, March 29, 2012, 7:02 PM
>=20
>=20
> A couple of questions -=20
>=20
> 1) What flavor of NPE are you using?
>=20
> NPE-G1
>=20
> 2) Is the GigE interface on the NPE-G1/G2=A0 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?
>=20
> Laptop connected directly to router via slot 4=A0
> PA-FE-TX
>=20
> 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.
>=20
> PCI bus mb1 has 390 bandwidth points
> PCI bus mb2 has 500 bandwidth points
>=20
>=20
> Have you *hard-coded* speed and duplex on any of you eth
> ints? Please don't!
>=20
> GIGE has been both hard and auto .. same results .. Fast
> Ether has always been set @ auto
>=20
> Let both ints auto-negotiate speed&duplex.
>=20
> Comcast states that we are required to have a hard code FULL
> DUPLEX and SPEED 100 as well as flow control OFF however I
> can not appear to be able to disable it :(
>=20
>=20
> after having done so, post the output of:
>=20
> sh int gi x/y and sh int fa x/y
>=20
> (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)
>=20
> ./Randy
>=20
>
