S7700V200R010C00SPC600X系列板卡作随板AC功能AP上线失败

S7700V200R010C00SPC600X系列板卡作随板AC功能AP4050DN上线失败
设备配置信息：
<PMJT_WX_SW-CORE>display device
Chassis 2 (Master Switch)
S7710's Device status:
Slot  Sub Type         Online    Power      Register       Status     Role 
-------------------------------------------------------------------------------
1     -   ES1D2X32SX2S Present   PowerOn    Registered     Normal     NA       //X系列板卡做随板AC
#
interface Vlanif54
ip binding vpn-instance Pmjgjgy
ip address 172.x.128.1 255.255.254.0   
 dhcp select global
#
ap auth-mode no-auth                                                            //AP认证模式不认证
#
capwap source interface vlanif54
#

1、查看AP系统信息确认已经获取到IP地址
<Huawei>display system-information  
System Information
===============================================
Serial Number            : xxxxxxxxxxxxJ3005441
System Time              : 2017-01-13 02:50:54
System Up time           : 15hour 47min 55sec
System Name              : Huawei
Country Code             : xx
MAC Address              : xx:xx:xx:xx:6d:40
Radio 0 MAC Address      : xx:xx:xx:xx:6d:40
Radio 1 MAC Address      : xx:xx:xx:xx:6d:50
IP Address               : 172.x.129.176                  //AP已经获取到管理网段的IP地址
Subnet Mask              : 255.255.254.0
Default Gateway          : 172.x.128.1
IPv6 IP Address          :
IPv6 Default Gateway     :
Management VLAN ID(AP)   :
IP MODE                  : dhcp
Slot Status              : Dual band(802.11b/g/n;802.11a/n/ac)
AP Type                  : AP4050DN
Board Type               : AP4050DN
Board Serial Number      : xxxxxxxxxxxx
Board Bom Version        : 0
Boot Rom Version         : 466
Software Version         : V200R007C20SPC500
Hardware Version         : H84D2TD1D505 VER.A
Telnet Access            : Disable       
User Name                : admin         
LED Switch               : ON            
===============================================
2、trace object  mac-address xxxx-xxxx-6d40
[BTRACE][2018/06/05 11:41:20][WLAN_AC][xxxx-xxxx-6d40]:[CAPWAP] Process discovery request message.
[BTRACE][2018/06/05 11:41:20][WLAN_AC][xxxx-xxxx-6d40]:[CAPWAP]ClntJudgeRecDevAckProc Jud Err ret 40 HasOrNot 1 State 1. MAC: xxxx-xxxx-6d40 //上线报错        

capwap source interface作为AP接入接口不支持绑定VPN实例

去掉vlanif54接口绑定的VPN实例
#
interface Vlanif54
undo ip binding vpn-instance Pmjgjgy            //删除绑定的vpn实例
ip address 172.x.128.1 255.255.254.0   
 dhcp select global
#