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capwap tunnel issue

We have a 4404 controller running on 7.0.116.0. All the ap's registered to that wlc suddenly had capwap flapping. Aps were then stable after few mins. We didnt see any issue on the switch/fw (L3 interface created). Any idea what could be checked ? 

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VIP Mentor

it could be a network replated issue.

1. what does the swicth interface look like ? How is it configured and are there any errors on AP connected ports ?

2. What are the AP logs showing?  Also, on the controller web interface under Monitor > Statistics > AP Join, what do you see under Last Error Summary?

 

 

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Checked network related logs.. no fault found. Please find the below error from AP join statistics.

Last AP Connection Failure
Last AP Disconnect Reason
Last Error Occurred
Last Error Occurred Reason
Last Join Error Timestamp
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must be a bug:

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCum86401/?referring_site=bugquickviewredir

 

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Chekc if LWAPP and CAPWAP ports are open to buid a tunnel from AP to wlc.

LWAPP port 12222 and 12223

CAPWAP: 5246 - control, 5247 - data

 

 

Example:

 

When an AP running a version before 5.2 joins a 5.2. WLC, the following process is used:

AP joins the 5.2 controller using LWAPP 12223.

AP downloads 5.2 code and reboots.

AP joins the 5.2 controller using CAPWAP 5246.

If the AP is unsuccessful, it falls back to LWAPP. *note that a CAPWAP AP will be not be allowed to register using LWAPP to a CAPWAP WLC*

 

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