Cisco AP-格式化AP

故障情况：
APC11-AP04#sho capwap ip config
 
LWAPP Static IP Configuration
IP Address         172.17.239.204
IP netmask         255.255.255.0
Default Gateway    172.17.239.254
Primary Controller 172.16.245.29 
 
APC11-AP04#
 
Translating "CISCO-CAPWAP-CONTROLLER"...domain server (255.255.255.255)
 
APC11-AP04#capwap ap ip add 172.17.239.204 255.255.255.0 172.17.239.254
                                                         ^
% Invalid input detected at '^' marker.
 
APC11-AP04#
Translating "CISCO-CAPWAP-CONTROLLER"...domain server (255.255.255.255)
APC11-AP04#capwap ap ip add 172.17.239.204 255.255.255.0?             
A.B.C.D 
 
APC11-AP04#capwap ap ip add 172.17.239.204 255.255.255.0
You should configure Domain and Name Server from controller CLI/GUI.
APC11-AP04#
 
APC11-AP04#cap
APC11-AP04#capwap
Translating "CISCO-CAPWAP-CONTROLLER"...domain server (255.255.255.255)
 
Translating "CISCO-CAPWAP-CONTROLLER"...domain server (255.255.255.255)
% Incomplete command.
 
APC11-AP04#capwap ap primary-base GTMC-DLR-WLC-01 172.16.245.29
APC11-AP04#
APC11-AP04#
APC11-AP04#
APC11-AP04#
 
APC11-AP04#
APC11-AP04#ping 172.16.245.29
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.16.245.29, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 20/21/24 ms
APC11-AP04#
APC11-AP04#
APC11-AP04#
APC11-AP04#
APC11-AP04#
*Mar  1 00:08:29.323: AP has SHA2 MIC certificate - Using SHA2 MIC certificate for DTLS.
 
Writing out the event log to flash:/event.log ...
 
APC11-AP04#
APC11-AP04#
*Aug  6 11:11:53.000: %CAPWAP-5-DTLSREQSEND: DTLS connection request sent peer_ip: 172.16.245.29 peer_port: 5246
*Aug  6 11:11:53.275: %CAPWAP-5-DTLSREQSUCC: DTLS connection created sucessfully peer_ip: 172.16.245.29 peer_port: 5246
*Aug  6 11:11:53.275: %CAPWAP-5-SENDJOIN: sending Join Request to 172.16.245.29

如上情况这个AP发生了重启，且重启后没有使用默认的IOS启动，而是使用了统自带的恢复镜像。说明，此AP的磁盘可能发生损坏。
 
Loading "flash:/ap3g2-rcvk9w8-mx/ap3g2-rcvk9w8-xx"...########################
File "flash:/ap3g2-rcvk9w8-mx/ap3g2-rcvk9w8-xx" uncompressed and installed, entry point: 0x1003000
executing...

具体操作和说明：
1，根据现有的日志，能看到AP使用的是recover的镜像来启动的。
2，原有镜像无法启动的原因，可能是由于镜像损坏。
3，根据经验，AP如果启动原有的镜像失败，启动新镜像时会丢失WLC的name。
4，如果故障再次发生的话，可以将AP的flash格式化，然后重新导入镜像来尝试恢复，也可以通过从WLC重新下载镜像的方式覆盖掉原有的镜像。
 
格式化的命令如下：
 
Fsck flash:
 
镜像恢复：
 
 
ap: ether_init
 
ap: flash_init
 
ap: tftp_init
 
ap: set IP_ADDR
 
ap: set NETMASK
 
ap: set DEFAULT_ROUTER
 
ap: tar -xtract tftp://< server ip address >/< image name > flash:
 
example:
 
tar -xtract tftp://10.124.40.59/ap3g2-k9w8-tar.153-3.JD.tar  flash:
 
 
ap: boot flash:/< mage dir >/< image name >
 
example:
 
Boot flash:/ap3g2-k9w8-mx.153-3.JD/ap3g2-k9w8-mx.153-3.JD