The version of MGMD which is running on this interface.
Value 1 applies to IGMPv1 routers only. Value 2 applies
To IGMPv2 and MLDv1 routers, and value 3 applies to IGMPv3
and MLDv2 routers.
This object can be used to configure a router capable of
running either version. For IGMP and MLD to function
correctly, all routers on a LAN must be configured to run
the same version on that LAN. This object MAY be
modified under any rowstatus condition.