The value of vRtrIgmpHostMaxSources specifies the maximum number of
sources per group for which IGMP can have local receiver information
based on received IGMP reports on this subscriber host. When this
configuration is changed dynamically to a value lower than currently
accepted number of sources, the sources that are already accepted are
not deleted. Only new sources will not be allowed. When this object has
a value of 0, there is no limit to the number of sources.