This object indicates the multicast flag associated with
the group/source related to the indices:
'static' -
The group state is configured via snooping profile
'dynamic' -
The group state is learnt as a result of receiving
IGMP/MLD reports.
'staticAndDynamic' -
The group state is both statically configured via
snooping profile and learnt as a result of receiving
IGMP/MLD reports.
'unknown' -
The group state is not known.