Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

Problem with interfaces on a 4506 switch

I have a Catalyst 4506 switch and have the following issue. A month ago I had a power supply failure and that caused about 10 phones to stop working as whoever spec'ed the power supplies did it incorrectly and the power supplies would not support all the phones on one power supply. So when the failure happened we moved the 10 problem phones over to another switch. We have since replaced the power supply and want to move the users back to their switch. When we do this and try and return them to their orignal interfaces nothing happens but if I connect them to another interface they work fine. I checked the int's to make sure they were not shutdown, I even did a shiut then a no shut and nothing. I did a show power and all shows good. Is there anything I should be doning or checking to track down this problem?



Re: Problem with interfaces on a 4506 switch


Have you tried this ?

Some problems can be solved by resetting the switching module. Use the hw-module module reset command to reset a switching module, or remove and re-insert the switching module, which resets, restarts, and power cycles the switching module. The show module and show diagnostics online module commands can also provide information useful in solving problems with ports on individual modules.



Re: Problem with interfaces on a 4506 switch

I can't reset anything right now as people are in working and downtime can't be had during the day.

Here are some things I have done....

I took the phone in question and connected it to another port on the switch and it works the phone is good.

I connected just the PC into the port that won't work with the phone and the PC works fine so the port will pass data.

So it looks like the issue is the port is not supplying power.

I did a power.....and it shows good with 1016w used and 2800w Maximum it looks good there.

There are other phones on the module that are getting power with no problems.

I issued a.....power inline never.....command and then a ......power inline auto the port in question and still nothing.

I also issued the port a shut and then no shut....still nothing.

Is there anything else I can do other than reset the module and hope it works?




Re: Problem with interfaces on a 4506 switch

You could try this :

Static ports have a higher priority than auto ports in terms of power allocation and shutdown. The switch allocates power for a static port when it is configured.

i.e With the static mode, the powered device is guaranteed to come online when plugged in.

Be sure that ports is not configured to never provide inline power, thus turning them into data-only ports.

If you still have problems I think you have to reset the module in the next service window.



Re: Problem with interfaces on a 4506 switch

I am going to try that. Thank you.


New Member

Re: Problem with interfaces on a 4506 switch

Hi Mike,

What blade is it?

I had the *very same* issue last week on a 4248 in which I asked Cisco for an EFA for a few reasons. I don't think the blade model number matters though.

Resetting the module in my situation resulted in no change in status. Diag commands on the ports indicated were normal.

If you RMA the blade, ensure you ask Cisco for a Engineering Fault Analysis so they will have yet another instance of the same failure to look at.


HTH, any rating appreciated.

Re: Problem with interfaces on a 4506 switch

Thanks....I might just do that.