Question:

Does Versa support co-existing of untagged interface and tagged interface on the same physical port?

Answer:

There are no known issues with tagged and untagged interfaces on the same physical port.

The sample example output below demonstrates the co-existence of tagged and untagged traffic.

admin@<branch-name>-cli(config)% show interfaces vni-0/2 
enable true;
unit 0 {
    vlan-id 0;                     =====================> Untagged interface
    family {
        inet {
            address 2.2.2.2/24;
        }
    }
}
unit 3001 {
    vlan-id 3001;
    enable  true;
    family {
        inet {
            address 192.168.1.1/24;
        }
        inet6 {
            address 2001:192:168:1::1/64;
            mode router;
        }
    }
}
unit 3501 {
    vlan-id 3501;
    enable  true;
    family {
        inet {
            address 172.16.1.1/24;
        }
        inet6 {
            address 2001:172:16:1::1/64;
            mode router;
        }
    }
}
[ok][2018-09-10 10:56:36]