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Troubleshooting Of AP Offline For AP6010-SN(V200R005C10SPC700)

Publication Date:  2016-03-24 Views:  155 Downloads:  0
Issue Description

AP offline

Handling Process

1. AP offline and found it was due to Echo interval timeout. From the capture packet file, AC did not receive the echo packets of AP.

And also there was record for this from the log--AC.

2. From the capture packet file, the AP-7 sent the echo request packet to AC and kept alive the CAPWAP. But after 06:59:12 the AC received the last packet. There was not any packet from AP-7

3. From the offline record of AP and the log, it is due to the Echo interval timeout.

4. So, it is the quality of network result in the AP offline. From the log of AP, found the port UP/Down at least 30s. E.g: for AP-49:

5. logon the SW that connected with AP-49. Found neighbor information just as below:

6. Check the log of LSW, the port GE0/0/22 UP/Down frequently. And the down time will last at least 30s. The reason was due to the mac-flapping b4ce-f6dd-2c21. When mac-flapping recover, the AP become online.

7. Check the log AC, found that the MAC (b4ce-f6dd-2c21) was for roaming user. It was normal when the user roaming, the MAC of the user will be flapping.

8. Undo the command ” error-down auto-recovery cause mac-address-flapping interval 30” and the issue was resolved.

Root Cause
When configure the commands just as below for access SW.
#
error-down auto-recovery cause mac-address-flapping interval 30
#
An interface enters the Error-Down state after being shut down due to an error. Currently, errors include the, MAC address flapping.
when there is mac flapping(even for the terminals), the port will be shut down for 30s. The AP will offline during this time.
Solution
1. Undo the command ” error-down auto-recovery cause mac-address-flapping interval 30”
Suggestions
During the Troubleshooting, using different way to reduce the arrange of  possible root cause. That will be helpful for the work.

END