We have a few WLC's on our Network. The last WLC we deployed is having issues with connectivity. Persistent PING tests are showing drops every 20 packets or so. We noticed that the Mgt VLAN is flapping in STP.
The WLC is connected to a 4506 Switch 10/100/1000 mode. Auto negotiation is on and the port on both sides is 1000/Full. Having no issues with the others controllers.
4506 port config:
description Trunk to nyc1-32-wlc-02
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,50-52
switchport mode trunk
VLAN 52 is the Mgt VLAN associated with the WLC. Any help would be appreciated. Thank you.
Do you have multiple links from the controller connected currently? If so, did you enable LAG on the controller? It does not look like this 4506 port is set as a port-channel, so that could possibly be the issue.
We have multiple links, but they aren't connected. Currently, we're dealing with Port 1 on 4506-1. LAG is disabled.
On our other WLC's, we have LAG disabled, Mgt Int port 1 backing up to port 2 and an AP-Manager on each port. Port 1 connects to 4506-1, Port 2 connects to 4506-2. Do you think having only port 1 connected might be the problem?
No, but that is a good idea. Do you happen to know what .PDF and page that is from? We used the 3.x guide when we originally configured the port and was under the impression that your approach is only recommended when using LAG mode.
BTW, the problem went away after swapping the SFP GBIC modules. They are from Cisco and I'm not sure why the pair we purchased is causing the problem. Once we installed two GBICs from a working WLC, the problem went away. Same firmware, same config. Odd...
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