topic Hi, Could you please update in Wireless

GLC-LH-SMD not running on CT5520 WLC

hhallal01 — Mon, 05 Jul 2021 14:08:48 GMT

Hello,

I am running a CT5520 WLC with GLC-LH-SMD transceivers; the port state is always down.

Are the GLC-LH-SMD compatible with the CT5520 WLC?

Regards,

Hassan.

I am running a CT5520 WLC

Leo Laohoo — Thu, 01 Jun 2017 08:09:36 GMT

I am running a CT5520 WLC with GLC-LH-SMD transceivers; the port state is always down.

They are compatible if the controller is running the correct firmware. Early 8.1 codes had a bug with SFP modules where the ports will stay down.

Hello Leo,

hhallal01 — Thu, 01 Jun 2017 09:09:41 GMT

Hello Leo,

Thank you for your prompt reply, i am upgrading the WLC to the 8.2 version.

I will keep you posted.

Hello,

hhallal01 — Thu, 01 Jun 2017 09:46:39 GMT

Hello,

I have upgraded the WLC to the 8.2 version, the problem is always there.

Following to the 5520 WLC deployment guide LINK, for the GLC-LH-SMD to work it needs a GLCT plugged in the port number #1.

Is the existence of a GLCT mandatory ??

BTW i have noticed that the fans sound is more quiet.

Regards,

Hassan

Hi, Could you please update

aous.salloum — Tue, 13 Jun 2017 00:08:11 GMT

Hi, Could you please update the status? I am installing 5520 controllers with GLC-LH-SMD next week!

Thank you kindly.

Try plugging a GLC-TX in port

Leo Laohoo — Tue, 13 Jun 2017 01:38:53 GMT

Try plugging a GLC-TX in port 1.

Thank you, so can I have two

aous.salloum — Tue, 13 Jun 2017 01:42:19 GMT

Thank you, so can I have two GLC-LH-SMD on ports 1 and 2 , or I need GLC-T ?

I believe you need to have a

Leo Laohoo — Tue, 13 Jun 2017 02:21:29 GMT

I believe you need to have a GLC-T in port 1 before subsequent ports will enable SFP modules.

Hi Everyone,

hhallal01 — Tue, 13 Jun 2017 08:05:30 GMT

Hi Everyone,

Following are my findings regarding this issue:

The use of GLC-LH-SMD only will not sort the issue, the port will stay down.
The use of GLCT on port#1 and a GLC-LH-SMD on port#2 will sort the issue, both ports will be up and running.

NOTE:the number/location of the ports are a bit confusing, more precisely the port#1 is located on the right side while port#2 is located on the left side. The GLCT should be strictly installed on port#1 in order for the GLC-LH-SMD installed in port#2 to work.
NOTE:reboot the WLC after moving the transceivers from a port to an other.

Regards,

Hassan

Re: I believe you need to have a

joe.fodor — Thu, 24 Jan 2019 14:18:40 GMT

Hello,

I just ran into this issue installing some 5520 controllers. One of my controllers worked just fine with two GLC-SX-MMD SFPs in both ports. My secondary controller did not. I couldn't figure it out for the life of me until I found this thread. As soon as I put in a GLC-T into port 1 the 10G LED on the controller went off and my GLC-SX-MMD on port 2 started working.

Is this documented somewhere by Cisco? This seems like strange behavior.

Re: I believe you need to have a

Leo Laohoo — Fri, 25 Jan 2019 06:49:54 GMT

Depends on the firmware of the controller.
As I've mentioned in the beginning of this thread, this is a known bug.

Re: Hi Everyone,

gcube — Sat, 09 Nov 2019 23:44:09 GMT

I spent a lot of time figuring out why does the 2ports on the 5520 running initially on 8.3.133 and upgrade to 8.10.105 and still doesn't come up using SFP10-SR; GLC-LH-SMD and GLC-TE until I found this thread.

The bottom line is GLC-T is the key to make this 10G ports work in 1G even on the newest version at this point. able to use the Port2 using GLC-LH-SMD.