Did you ever hear back from this post? I'm having the same issue.
I'm having the same issue but with a Cisco 2821 GE0/0 connecting to a Cisco 2821 GE0/0... Speed 10 works fine but when wanting to lock the duplex to full at both ends, link goes up/down. Only when I move one end to duplex auto, link goes up/up (however duplex mis-match). Only when I go duplex auto on both interfaces does the link go up/up. In the past I've always been told to take speed/duplex negotiation out of the picture when working with router-2-router links. Is this old school thinking with these 2800 ISRs?
No - Tried different options (cross-over cables and patch cords) I'm thinking that my old-school practices ended when GigE interfaces hit routers.
I also find it funny when testing my 2800 with a 3800 - I lock the duplex to full but when I try to lock the speed to 10, link goes up/down. Only goes back up/up when I set the speed option back to auto.
You're not, perchance, using a pair or two for voice or other signaling are you?
GigE uses all four pair. If you have one or two bad pair, the system will downshift to the lower speed / duplex.
Is that "cat 6 certified" cable hand made or store bought?
This problem is nearly always a cabling issue.
Maybe try a longer cable, one meter is the lower limit ... maybe you have a "collective tolerances" issue; everything is within the envelope of operation considered "OK" ... but the difference between the two are out of spec or beyond the limits of compensation.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are
looking for early feedback from customers befor...
Introduction Featured Speakers Luis Espejel is the Telecommunications
Manager of IENova, an Oil & Gas company. Currently he works with Cisco
IOS® and Cisco IOS XE platforms, and NX to some extent. He has also
worked as a Senior Engineer with the Routing P...
In this session you can learn more about Layer 3 multicast and the best
practices to identify possible threats and take security measures. It
provides an overview of basic multicast, the best security practices for
use of this technology, and recommendati...