Link Down on WLC

[JustTakeTheFirstStep]

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 · Accepted solution]

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.

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[JustTakeTheFirstStep]

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

[JustTakeTheFirstStep]

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

https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-1/5520-WLC-DG/b_Cisco-5520-WLC-deployment-guide.html

[Leo Laohoo]

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@JustTakeTheFirstStep wrote:

I think the 5520 only supports 10G SFP.

I'm right??

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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.