Allocated Aggregate interface IP not reachable.

I am using Fortigate FG-VM16V for production environment.

1. My virtual device is deployed over openstack with 16 sriov interfaces.

1. port1,port5,port9,port13  (vlan xxxx ) used for TRUST side and connected to physnets sriov1,sriov2,sriov3, sriov4.

2. port2,port6,port10,port14 (vlan yyyy ) used for UNTRUST side and connected to physnets sriov1,sriov2,sriov3, sriov4.

3. port3,port7,port11,port15 (vlan zzzz )used for OM connectivity and connected to physnets sriov1,sriov2,sriov3, sriov4.

4. port4,port8,port12,port16 (vlan aaaa )used for LOG connectivity and connected to physnets sriov1,sriov2,sriov3, sriov4.

While initialization only, aggregated ports are created as follows:

1. port1,port5,port9,port13 (TRUST aggregated port)

2. port2,port6,port10,port14 (UNTRUST aggregated port)

3. port3,port7,port11,port15  (OM aggregated port)

4. port4,port8,port12,port16 (LOG aggregated port)

The IP address assigned to OM aggregated port is assigned from externally available IP address pool. But the allocated IP address is not reachable from outside.

I tried pinging GW from openstack provided VM console. that too not getting pinging.

am i missing some thing here? Am i missing gateway to be configured for aggregated interface?

If this is the case, how to configure gateway for aggregated interface?

Pls help on urgent basis. Thanks.