topic Link Down on WLC in Wireless

Link Down on WLC

JustTakeTheFirstStep — Mon, 05 Jul 2021 19:46:14 GMT

WLC is setting.

SW and WLC are connected with an 1G multi fiber cable,

but WLC is Link Down and SW is notconnect.

What is the problem??

Switch#sh ip int b
Interface IP-Address OK? Method Status Protocol
Vlan1 172.29.22.2 YES manual up up
Vlan50 172.29.26.2 YES manual up up

Switch#sh run int g1/1/1
interface GigabitEthernet1/1/1
switchport mode trunk

Switch#sh int status

Gi1/1/1 notconnect 1 full 1000 1000BaseSX SFP

Leo Laohoo — Mon, 09 Nov 2020 11:37:47 GMT

5520/8540 controllers require a GLC-T in port 1 to be able to use SFP in ports 2, 3 and 4.

Failure to do so means the port will remain down.

Read SFP Support. It is specifically stated:

Needs GLC-T on Port 1.

JustTakeTheFirstStep — Mon, 09 Nov 2020 11:48:40 GMT

Link down even when connected to port 2.
What should I do??

JustTakeTheFirstStep — Mon, 09 Nov 2020 12:11:33 GMT

I think the 5520 only supports 10G SFP.

I'm right??

There is an * mark in the middle of the support SFP list. (*Needs GLC-T on Port 1.)

Can I use GLC-SX on port 2 by inserting GLC-T in port 1??

I don't know if I understand

Leo Laohoo — Mon, 09 Nov 2020 23:13:57 GMT

@JustTakeTheFirstStep wrote:

I think the 5520 only supports 10G SFP.

I'm right??

I have already provided a response on this question.

IMPORTANT: The link I've provided specifically states to use "GLC-T" & "GLC-TE" will NOT work.