Aggregate interface not passing traffic, when sub-interfaces(vlans) are configured

AND

One or more of the sub-interfaces(vlans) for the aggregate interface is disabled

It is not possible to disable only a single sub-interface of an SSR, instead the parent interface is disabled.

network-interface exist inside a device-Interface

Network-interface does not have a disable option. The vlans or sub interfaces are a network-interface.

Mist UI provided a disable checkbox on the vlan (network-interface), that will disable all connectivity at the device-interface level causing all traffic to stop for the interface

Reference:

https://docs.128technology.com/docs/config_reference_guide#network-interface

https://docs.128technology.com/docs/config_reference_guide#device-interface