Description: Parameter to enable or disable IGMP snooping on the device.
When enabled, the device will examine IGMP packets and set
up filters for multicast traffic.
        
        The Internet Group Management Protocol (IGMP) is an internal
        protocol of the Internet Protocol (IP) suite. IP manages
        multicast traffic by using switches, routers, and hosts that
        support IGMP. Enabling IGMP makes the device to gather 
        multicast group membership information by snooping IGMP
        packets, which helps the device switch IP multicast traffic
to the ports where group members exist instead of flooding the 
traffic to every ports. 

IGMP have three fundamental types of message as follows:
        
        Message  Description
        --------------------------------------------------------------
        Query    A message sent from the querier (IGMP router or switch)
                 asking for responses from each host belonging to a
                 multicast group.
        
        Report   A message sent by a host to the querier to indicate
                 that the host wants to be or is a member of a given
                 group indicated in the report message.
        
        Leave    A message sent by a host to the querier to indicate
                 that the host has quit to be a member for a specific
                 multicast group.

The IGMP snooping functionality is configured on a vlan basis. 
To enable or disable IGMP snooping on vlans:
1. set igmpSnoopingStatus to enable(1) or disable(2).
2. specify on which vlan IGMP snooping works by configuring
   each entries in the igmpSnoopingTable.

As a result, you can turn on or off IGMP snooping functionality 
by setting igmpSnoopingStatus while keeping the configuration 
for each vlan. Or you can turn on or off IGMP snooping for a 
specific vlan in igmpSnoopingTable with the statuses on other 
vlan untouched.