The value of msapTlsPlcyIgmpSnpgMvrFromVplsId specifies from which
VPLS the multicast streams corresponding to the groups learned
via the MSAP are copied.
Groups which cannot be joined to the corresponding MVR VPLS
(because MVR is not up or the configured MVR policy rejects the group)
copy the multicast streams from the local VPLS if IGMP snooping is up
(i.e. tlsIgmpSnpgCfgAdminState is 'enabled').