Recently had an issue with a Cisco 5508 WLC where RLDP was enabled and the clients were complaining of being disconnected several times a day.

 

Jumped directly onto the AP via SSH and went through the logs and could see message’s like the following every 2/3 minutes:

 

*Oct 15 10:37:20.851: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Oct 15 10:37:34.983: %LWAPP-5-RLDP: RLDP stopped on slot 0.
*Oct 15 10:37:35.043: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Oct 15 10:37:35.287: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Oct 15 10:37:36.043: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Oct 15 10:37:36.279: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Oct 15 10:37:37.279: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Oct 15 10:39:14.483: %LWAPP-5-RLDP: RLDP started on slot 0.
*Oct 15 10:39:14.959: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Oct 15 10:39:14.999: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Oct 15 10:39:15.967: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Oct 15 10:39:15.987: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Oct 15 10:39:15.991: 000f.7de8.XXXX-no legacy rates; default to lowest CCK/OFDM rate
*Oct 15 10:39:16.987: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up
*Oct 15 10:39:31.175: %LWAPP-5-RLDP: RLDP stopped on slot 0.
*Oct 15 10:39:31.235: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to down
*Oct 15 10:39:31.479: %LINK-5-CHANGED: Interface Dot11Radio0, changed state to reset
*Oct 15 10:39:32.235: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to down
*Oct 15 10:39:32.471: %LINK-6-UPDOWN: Interface Dot11Radio0, changed state to up
*Oct 15 10:39:33.471: %LINEPROTO-5-UPDOWN: Line protocol on Interface Dot11Radio0, changed state to up

Fix/Workaround

The Fix is too disable RLDP or enable only for MonitorOnly (Listen) APs:

If you go Security Tab –> Wireless Protection Policies –> Rogue Policies –> General

You will find the following setting:

5508-1

Either mark for Disable or MonitorModeAPs

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