nanog mailing list archives
Re: Comcast Ethernet Feed
From: Brielle Bruns <bruns () 2mbit com>
Date: Thu, 29 Mar 2012 19:06:59 -0600
On 3/29/12 6:53 PM, Jon Lewis wrote:
On Thu, 29 Mar 2012, Brielle Bruns wrote:From my own experience here with our 7200s, some of the PA based 100BaseT interfaces (ie: not on the IO module) can not negotiate 100-full, but rather only half. This leaves one end diff then the other and creates issues with performance. Try forcing both the laptop and router to 100-full and see if it helps.Those interfaces don't to auto-negotiation at all. That's why they default to 100 half. OP said they were using a Gig interface though. Maybe a copper 10/100/1000 port on an NPE-G<1|2>? I haven't used those, but I'd bet they support auto-negotiation. 1000baseT requires it.
I'm pretty sure the PA-FE-TX boards can do auto neg, just not 100 full (just tested with a 7507 with a VIP4 w a PA-FE-TX and a cheap 10BT hub - my 7206VXR is not powered up ATM).
Believe it has something to do with the DEC ethernet chip they use (I have an older desktop that just happens to have the same DEC chipset that those do and has exactly the same problem).
Based on what he said, I read his setup as having a G1 or G2 NPE, using the on-NPE gig to hook to comcast, and a PA-FE-TX in one of the PA slots.
At least, that's how it sounded to me - why else use 100BaseT on a gige as most laptops and desktops in the past... 4-5 years or so have onboard gige?
-- Brielle Bruns The Summit Open Source Development Group http://www.sosdg.org / http://www.ahbl.org
Current thread:
- Re: BCP38 Deployment, (continued)
- Re: BCP38 Deployment Bingyang LIU (Mar 28)
- Re: BCP38 Deployment Eric Brunner-Williams (Mar 28)
- Re: BCP38 Deployment Bingyang LIU (Mar 28)
- Re: BCP38 Deployment goemon (Mar 28)
- Re: BCP38 Deployment Joe Provo (Mar 29)
- Re: BCP38 Deployment Jon Lewis (Mar 29)
- Re: BCP38 Deployment Joe Provo (Mar 29)
- Comcast Ethernet Feed Brian R. Watters (Mar 29)
- Re: Comcast Ethernet Feed Brielle Bruns (Mar 29)
- Re: Comcast Ethernet Feed Jon Lewis (Mar 29)
- Re: Comcast Ethernet Feed Brielle Bruns (Mar 29)
- Re: Comcast Ethernet Feed Brielle Bruns (Mar 29)
- Re: Comcast Ethernet Feed Brian R. Watters (Mar 29)
- Re: Comcast Ethernet Feed Brielle Bruns (Mar 29)
- Re: Comcast Ethernet Feed Brian R. Watters (Mar 29)
- Re: Comcast Ethernet Feed Ian Henderson (Mar 29)
- Re: Comcast Ethernet Feed Derek Ivey (Mar 29)
- Re: Comcast Ethernet Feed Randy (Mar 29)
- Re: Comcast Ethernet Feed Brian R. Watters (Mar 29)
- Re: Comcast Ethernet Feed John Neiberger (Mar 29)
- Re: Comcast Ethernet Feed Randy (Mar 29)