We're experiencing weird issue with autonegotiation on two 3750 switches.
1. WS-C3750G-24TS-S, IOS 12.2(25)SEB4
One of the gigabit ports (GigabitEthernet) of the switch is configured to speed auto, duplex auto. When I attach a server with gigabit interface (both speed and duplex set to auto) I see that the switch port was negotiated to 10/full, from the server side it's 100/full. I don't see any CRC errors on the switch interface and the link is up. I tried to force 1000/full on both sides but link goes down for good. As soon as I put auto the line is up with 10/full on a switch side and 100/full on a server side.
2. WS-C3750G-24TS-S, IOS 12.2(25)SEB4
Same situation as in case 1, but this time the speed is negotiated to 100/full on both sides, although they should support 1000/full. Again, no CRCs and forcing the speed brings interface down.
Tried to replace cables and switch ports -- no luck. I have plenty of other servers (same hardware, same driver version) connected to this switches that work 1000/full.
Does it look like IOS bug? Any hints would be greatly appreciated!
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...