Indicates the VLAN-based IGMP user max VLAN tag mode.
Options:
1. unaware(1) -indicates that the maximum number of VLAN tags for the IGMP user is not concerned.
2. untag(2) -indicates that the maximum number of VLAN tags for the IGMP user is untag.
3. single(3) -indicates that the maximum number of VLAN tags for the IGMP user is one tag.
4. double(4) -indicates that the maximum number of VLAN tags for the IGMP user is two tags.
Default: unaware(1)
This leaf is optional for creating a VLAN service profile.