5520 on single connection

[Wes Schochet]

Hi All-

We are doing some bandwidth testing and I wanted to set my 5520 up on a single 10 Gig connection.  The previous config was two 10G trunk ports in a port channel.  I configured the switch port as a trunk without the channel group and set "LAG Mode on next reboot" to disable.  After the reboot, I have no connectivity.  I was wondering if anyone has done this before or could point me in the right direction.

Thanks,

Wes

[Dustin Anderson]

I'm not sure if on a single link it needs to be in port 1 or not. The only restriction I remember is if you wanted it to be a 1G link. When you say you have connectivity, you see no link light, or just can't contact the WLC?

Also, you mentions switchport, is it a switch or an NXOS core? They will default to the port shutdown and you need to no shut the port. Just a thought as I've done this myself.

https://www.cisco.com/c/en/us/td/docs/wireless/controller/5500/5520/install-guide/b-wlc-ig-5520/m-overview.html 

[Flavio Miranda]

Hi  @Wes Schochet 

 If you have a port-channel with 2 interface and you want to test if only one interface,  all you need to do is disconnect one cable. The idea of port-channel is offer redundancy. 

 Now, if you put the interface in trunk on the switch side and you disable lag on the wlc side, means you put the interface in access on the wlc side.

 You should put the interface in access also in the switch side on the vlan you use to management. 

 Thats why you probably lost access.

[Leo Laohoo]

Regardless if the WLC has only one link, ALWAYS configure LAG.  The "cost" of enabling LAG whilst only using one link is worth the hassle.

[Wes Schochet]

Thanks to all who responded.  I ended up with LAG enabled on the controller and a single, non-port-channel trunk port on the switch. This is working well: ~2,500 clients right now.