Issue : customer some Aps auto happened offline , the reason is Echo timeout .
===============display ap offline-record all===============
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Info: This operation may take a few seconds. Please wait for a moment.done.
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MAC Last offline time Reason
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8866-qqqq-a1c0 2018-10-28/17:27:27 Echo timeout
7ca2-ssss-6d80 2018-10-28/17:27:25 Echo timeout
0427-gggg-cac0 2018-10-28/17:27:25 Echo timeout
8866-hhhh-9920 2018-10-28/17:27:24 Echo timeout
7ca2-kkkk-6c20 2018-10-28/17:27:23 Echo timeout
Issue Analysis :
echo interval timeout --->The heartbeat packet transmission between the AP and AC times out. --->The AP gets offline. Generally, it is because the intermediate network is faulty.
But we don’t how to confirm the issue is the intermediate network flapping or faulty ? below is my suggest troubleshooting steps
1. Select one issue AP
<AC6005>display ap offline-record all
Info: This operation may take a few seconds. Please wait for a moment.done.
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MAC Last offline time Reason
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1122-3344-4020 2018-10-30/09:46:34 Echo timeout // confirm and remember the issue happen time .
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Total APs: 1 Total records: 1
<AC6005>dis ap all | in 4020 // find the issue AP IP address
Info: This operation may take a few seconds. Please wait for a moment.done.
Total AP information:
idle : idle [3]
nor : normal [1]
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ID MAC Name Group IP Type State STA Uptime
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1 883f-d39e-4020 AP8030DN default 10.0.0.100 AP8030DN nor 0 6D:3H:3M:29S
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Total: 4
<AC6005>sys
Enter system view, return user view with Ctrl+Z.
[AC6005]stelnet 10.0.0.100 //use ssh login this issue AP
Please input the username:admin
Trying 10.0.0.100 ...
Press CTRL+K to abort
Connected to 10.0.0.100 ...
Enter password: // default username is admin , password is admin@huawei.com
Info: Current mode: Fit (managed by the AC).
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User last login information:
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Access Type: SSH
IP-Address : 10.0.0.254
Time : 2018-10-29 03:36+00:00
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Info: You are advised to change the password to ensure security.
10,814 KB total (1,054 KB free)
<AP8030DN>cd logfile // into logfile
<AP8030DN>dir
Directory of flash:/logfile/
Idx Attr Size(Byte) Date Time(LMT) FileName
49 -ro- 1,113,714 Oct 30 2018 13:37:08 2018-10-30.13-44-04.dblg // find the dblg file which archived after the issue time . then use ftp download this file to local laptop
50 -rw- 974,488 Oct 30 2018 14:24:57 log.dblg
51 -rw- 307,165 Oct 29 2018 08:32:25 log.log
// find
ping key word.
Oct 30 2018 09:46:25+00:00 xx_L2_AP_new5 %PING/6/PING_RESULT(D)[2305363]:User used ping 192.168.20.2: 5 packet(s) transmitted, 0 packet(s) received, 100.00% packet loss.
Oct 30 2018 09:46:25+00:00 xx_L2_AP_new5 %WSRV/6/WSRV_INFOR(D)[2305364]:INFO WCWPADP_SavePingInfo[1078]: save ping info
From the searched key information , we find the AP send the 5 ping packet to AC capwap source ip address , but it cannot received any ping response .
Root cause : The heartbeat packet is lost between the AP and the AC. The default time of the heartbeat packet is 6 times, with an interval of 25 seconds. When the heartbeat packet of the AP is not received, the AC set the AP state to fault.
Solution : The customer is required to check the network equipment between the AP and the AC. What’s happen caused the heartbeat packet of the AP is discarded.
