We are facing a strange issue at the moment. We have some cables which are quite long around ~80m. on both sides we connect a patch cord of 3m. So we have a total length of 86m which is within specs. When I connect a device to that cable, I can see the dhcp request on the switchport but that frame is not forwarded to the server.
Is there a reason for this behaviour? I would suspect that if the cable would be too long, I wouldn't see the frame on the switch.
The device I try to connect is a phone. The strange thing is that we have already another phone model connected to this and everything works like a charm (Aastra DBC425). Now we want to connect a 7444ip phone and this one causes trouble. The easy assumption is that the phone has a problem but if I connect it to a shorter cable distance then it works.
By the way, the switches are 4500 chassis and OS used is IOS-XE 03.02.00.SG
We asked the company who installed the cableing to verify if there are any errors. Apparently there was an error between the mass and one pair hence the signal was disturbed.
Hence there is no problem on the switch or the phone. However, I would still be interested to know why I could see the frame on the switch port but that frame never reached the server. Be aware that this situation is not present since we have fixed the cable issue. Hence it seems that the switch detected the faulty connection?
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 custome...