Using VMware NSXv driver, when update the port with specified address pair, got exception

yangyubj@yangyubj-virtual-machine:~$ neutron port-update 26d1a5e7-a745-4f6a-b965-bb33709a8a23 --allowed-address-pair ip_address=10.0.0.0/8
Request https://10.155.20.92/api/4.0/services/spoofguard/spoofguardpolicy-9?action=approve is Bad, response <?xml version="1.0" encoding="UTF-8"?>
<error><details>The value 10.0.0.0/8 for vm (01985390-cf9a-4cf7-bad3-2f164edc45d9) - Network adapter 1 is invalid. Valid value should be {2}</details><errorCode>220</errorCode><moduleName>core-services</moduleName></error>
Neutron server returns request_ids: ['req-98cc6835-a2a2-43b3-bde4-b6aa47e313e1']

The root cause is the NSXv can not support cidr 10.0.0.0/8