Re: Media converter not working on cisco 9200 switch

Simone C · ‎02-08-2023

Good morning all, this is my first post here and I really hope someone will help me with a little issue I'm facing.

I have an Allied Telesis Media Converter MC13 (pretty old since it's End of life was in 2021) that should be connected on a switchport of my Cisco Catalyst 9200L-48T-4X, but when it's plugged, nothing happens. The MC port won't go up, nor the switchport. I then tried the same media converter on a Cisco 9200L-48P-4X model, with the same cable and same port configuration (switchport access and no more), and here it works properly. Both switches have same IOS release 17.03.05. The Media converter works on a speed of 10 and half duplex. I've tried to configure it manually, but even like that on the 48T switch nothing happens, while on the 48P it goes up. It is not using PoE since there's no power delivered on the switchport of the 48P switch. Both switches also are configured in the same way (sadly i cannot share the configuration because of privacy policies). Does anyone knows about any compatibility issue with that model of Media converter and the Cisco 9200 48T?

Thank you very much for any help.

Best regards

marce1000 · ‎02-08-2023

- Make sure that the end-nodes connected to the media converter are in the same duplex mode (including the MC13)

M.

-- Each morning when I wake up and look into the mirror I always say ' Why am I so brilliant ? '
When the mirror will then always repond to me with ' The only thing that exceeds your brilliance is your beauty! '

Simone C · ‎02-09-2023

Hello Marce,

I've checked the end-nodes connected on the media converter and everything is going on half duplex and speed 10.

Thanks

Leo Laohoo · ‎02-08-2023

The first 9200L-48T could be hitting bug very common in 16.12.X where the port would simply stop talking.

Workaround is to reload or cold reboot the switch.

Another way to test is to use a different port on the 48T or a different switch stack member and see if the port goes up. IF this works, then this confirms the bug.

Simone C · ‎02-09-2023

Hello Leo,

The current release on the 9200L-48T is 17.3.5 so I don't know the bug you mentioned is still present but I really think it doesn't.

thanks

Leo Laohoo · ‎02-09-2023

@Simone C wrote:
I don't know the bug you mentioned is still present but I really think it doesn't.

Prove me wrong. Either reboot the offending switch member or move the port to another switch.

Simone C · ‎02-09-2023

I will let you know if the reboot of the switch solve the problem. Meanwhile I've tested another switchport but it still doesn't work.

Thanks for help, I will update you once the switch is rebooted.

Leo Laohoo · ‎02-09-2023

And before anyone will suggest it, I am going to say it first: TDR is broken in IOS-XE. Any TDR result taken from IOS-XE is not to be trusted as accurate nor reliable.