S7510X的ONU上线后，下联终端不通

OLT1/11/0/1:2的onu下有终端，网关ping下联终端不通，能查到arp和mac地址，做流统发现终端未回包，请问可能是什么原因？

# interface Olt1/11/0/1

 description 4#jiaoxue(zhu)-1f 

 using onu 1 to 20 

 port link-type hybrid 

 port hybrid vlan 1000 3000 3016 3019 to 3020 3022 3024 tagged 

 port hybrid vlan 1 untagged

 #

# interface Onu1/11/0/1:2 

 description 4#jiaoxue(JK)zhu-1f 

 bind onu-id 00dd-b69f-6dc6 

 onu port-isolate enable 

 uni 1 vlan-mode trunk pvid 3000 3000 to 3000 

 uni 2 vlan-mode trunk pvid 3000 3000 to 3000

port link-type trunk 

 port trunk permit vlan 1 3000 

 loopback-detection enable vlan 1 to 4094

 loopback-detection action shutdown 

olt-Vlan-interface3000]dis arp int onu 1/11/0/1:2 

 Type: S-Static D-Dynamic O-Openflow R-Rule M-Multiport I-Invalid 

IP address MAC address VLAN/VSI name Interface Aging Type 

66.68.7.50 240f-9bb7-e18b 3000 Onu1/11/0/1:2 1198 D 

 66.68.7.51 40ac-bf4d-6ac0 3000 Onu1/11/0/1:2 1139 D   

<olt> 

<olt>dis qos po g 

 Direction: Inbound 

 Policy: liutong 

 Classifier: liutong 

 Operator: AND 

 Rule(s) :

 If-match acl 3999

 Behavior: liutong 

 Accounting enable: 

 0 (Packets) 

 0 (pps) 

 Direction: Outbound 

 Policy: liutong 

 Classifier: liutong 

 Operator: AND 

 Rule(s) :

 If-match acl 3999 

 Behavior: liutong 

 Accounting enable:

 5 (Packets) 

 0 (pps) <olt>