AP註冊不上線（現網中存在其它廠商的控制器）

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AP註冊不上線（現網中存在其它廠商的控制器）
在網路中存在兩台控制器MSG360(192.168.0.223)和TP-LINK AC(192.168.0.253)
AP是華三的WAP712C

1、排錯思路：
1）DHCP是在MSG360上，首先在AP查看是否能擷取地址
AP可以擷取地址
此處配置沒有記錄

2）在AP上查看capwap debug資訊
從AP的debug資訊可以看出，雖然MSG360(192.168.0.223)有發送discovery response過來，但是AP還是選擇了TP-LINK AC(192.168.0.253)作為控制器進行註冊，因為是TP-LINK的控制器，AP註冊不上去，所以AP報錯提示：Failed to load SSL certificates,uiAPID = 1. 然後進入Enter Sulking state，後變成 Enter Idle state。

WAP712C的capwap debug資訊：

*Jan  1 00:04:42:931 2014 H3C CWC/7/RCV_PKT: Received discovery response with SeqNum 0 from AC at 192.168.0.223:5246.*Jan  1 00:04:42:931 2014 H3C CWC/7/RCV_PKT: Verbose info for discovery response from AC 192.168.0.223:5246, length=128. 00 10 02 00 00 00 00 00 00 00 00 02 00 00 73 00 00 01 00 31 00 00 FF FF 00 02 00 14 00 02 00 02 00 00 00 00 00 04 00 04 00 00 00 41 00 00 00 00 00 05 00 03 39 39 00 00 00 00 00 01 00 00 06 04 40 A9 2E 3B A8 00 04 00 12 57 69 72 65 6C 65 73 73 43 6F 6E 74 72 6F 6C 6C 65 72 04 18 00 05 01 00 00 00 0A 04 18 00 05 02 00 00 00 0D 00 25 00 0F 00 00 63 A2 00 80 00 01 04 00 00 00 02 00 01.*Jan  1 00:04:42:932 2014 H3C CWC/7/RCV_PKT: Received discovery response with SeqNum 0 from AC at 192.168.0.223:5246.*Jan  1 00:04:42:932 2014 H3C CWC/7/RCV_PKT: Verbose info for discovery response from AC 192.168.0.223:5246, length=128. 00 10 02 00 00 00 00 00 00 00 00 02 00 00 73 00 00 01 00 31 00 00 FF FF 00 02 00 14 00 02 00 02 00 00 00 00 00 04 00 04 00 00 00 41 00 00 00 00 00 05 00 03 39 39 00 00 00 00 00 01 00 00 06 04 40 A9 2E 3B A8 00 04 00 12 57 69 72 65 6C 65 73 73 43 6F 6E 74 72 6F 6C 6C 65 72 04 18 00 05 01 00 00 00 0A 04 18 00 05 02 00 00 00 0D 00 25 00 0F 00 00 63 A2 00 80 00 01 04 00 00 00 02 00 01.*Jan  1 00:04:44:932 2014 H3C CWC/7/TMR: Discovery Interval timer expired.uiAPID = 1.*Jan  1 00:04:44:933 2014 H3C CWC/7/EVENT: Discovered AC by method of IPv4 broadcast successfully.*Jan  1 00:04:44:933 2014 H3C CWC/7/EVENT: AP selected AC IP 192.168.0.253 Priority 0 successfully.*Jan  1 00:04:44:935 2014 H3C CWC/7/ERROR: Failed to load SSL certificates,uiAPID = 1.*Jan  1 00:04:44:935 2014 H3C CWC/7/FSM: Enter Sulking state.*Jan  1 00:04:46:932 2014 H3C CWC/7/TMR: Silent Interval timer expired.*Jan  1 00:04:46:933 2014 H3C CWC/7/FSM: Enter Idle state.*Jan  1 00:04:46:933 2014 H3C CWC/7/EVENT: Start ipv4 dhcp opt43 discover.*Jan  1 00:04:46:933 2014 H3C CWC/7/EVENT: Start ipv4 broadcast discover.*Jan  1 00:04:46:942 2014 H3C CWC/7/EVENT: Open capwap client udp port:50048*Jan  1 00:04:46:942 2014 H3C CWC/7/FSM: Enter Discovery state.*Jan  1 00:04:46:943 2014 H3C CWC/7/EVENT: Fill discover req.wtu=1.model=WAP712C.wt drv info:[].subslot=0.licensetype=1.ret=0x40010001.*Jan  1 00:04:46:943 2014 H3C CWC/7/EVENT: Fill discover req.ap=1.model=WAP712C.licensetype=1.carry wt info is unnecessary.*Jan  1 00:04:46:944 2014 H3C CWC/7/SND_PKT: Sent discovery request with SeqNum 0 to AC 255.255.255.255:5246.*Jan  1 00:04:46:944 2014 H3C CWC/7/SND_PKT: Verbose info for discovery request sent to AC 255.255.255.255:5246, length=155. 00 10 02 00 00 00 00 00 00 00 00 01 00 00 8E 00 00 14 00 01 00 00 26 00 3A 00 00 63 A2 00 00 00 07 57 41 50 37 31 32 43 00 01 00 14 32 31 39 38 30 31 41 30 58 35 39 31 38 31 47 30 30 30 4B 31 00 03 00 05 56 65 72 2E 41 00 04 00 06 48 BD 3D 63 AD 60 00 27 00 28 04 04 01 01 00 00 00 00 63 A2 00 00 00 01 41 00 00 63 A2 00 01 00 05 52 32 32 32 31 00 00 63 A2 00 02 00 04 37 2E 31 31 00 29 00 01 0E 00 2C 00 01 02 04 18 00 05 01 00 00 00 0A 04 18 00 05 02 00 00 00 0D.

2、解決方案：

在網路中存在兩個AC的情況，可以在MSG360上配置二次AC發現功能

1）二次AC發現功能作用：

二次發現AC功能用於向AP提供建立CAPWAP隧道的目的AC的IP地址。開啟該功能後，AC發送的Discovery response報文中會攜帶CAPWAP Control IP Address訊息元素，AP收到Discovery response報文後，將向訊息元素中的IP地址發送Discovery request報文，達到二次發現AC的目的。

2）直接在AC1全域模式下配置：

system-viewwlan global-configuration control-address enable    #<==預設情況下二次發現AC功能處於關閉狀態

AP註冊不上線（現網中存在其它廠商的控制器）