与ODL（0.6.3）控制器第一次连接过程中，被断开了连接，请教是什么原因？

控制器上报了错误： severity=ERROR, errorType=APPLICATION, tag=operation-failed, applicatiOnTag=null, info=null, cause=java.lang.IllegalArgumentException: Metadata not available for modification NodeModification [identifier=(urn:opendaylight:inventory?revision=2013-08-19)node-connector[{(urn:opendaylight:inventory?revision=2013-08-19)id=3}], modificatiOnType=TOUCH, childModification={AugmentationIdentifier{childNames=[current-speed, state, maximum-speed, reason, configuration, supported, hardware-address, name, queue, port-number, peer-features, advertised-features, current-feature]}=NodeModification [identifier=AugmentationIdentifier{childNames=[current-speed, state, maximum-speed, reason, configuration, supported, hardware-address, name, queue, port-number, peer-features, advertised-features, current-feature]}, modificatiOnType=TOUCH, childModification={queue=NodeModification [identifier=queue, modificatiOnType=MERGE, childModification={queue[{queue-id=0}]=NodeModification [identifier=queue[{queue-id=0}], modificatiOnType=WRITE, childModification={}], queue[{queue-id=3}]=NodeModification [identifier=queue[{queue-id=3}], modificatiOnType=WRITE, childModification={}], queue[{queue-id=4}]=NodeModification [identifier=queue[{queue-id=4}], modificatiOnType=WRITE, childModification={}], queue[{queue-id=1}]=NodeModification [identifier=queue[{queue-id=1}], modificatiOnType=WRITE, childModification={}], queue[{queue-id=2}]=NodeModification [identifier=queue[{queue-id=2}], modificatiOnType=WRITE, childModification={}], queue[{queue-id=7}]=NodeModification [identifier=queue[{queue-id=7}], modificatiOnType=WRITE, childModification={}], queue[{queue-id=5}]=NodeModification [identifier=queue[{queue-id=5}], modificatiOnType=WRITE, childModification={}], queue[{queue-id=6}]=NodeModification [identifier=queue[{queue-id=6}], modificatiOnType=WRITE, childModification={}]}]}]}]]]}

其中有个现象是： 1、新增vlan2 2、vlan2里不设置任何接口 3、openflow映射vlan2 4、激活openflow成功 5、再往vlan2中增加接口 6、连接状态正常 7、断开控制器再打开，连接失败。失败错误同上面一样