Alternatively, the MGRS received a directive from the initiating site to remove that particular site from the multicast group. Once the group membership deletion is confirmed, the MGRS propagates the change up its hierarchy until a stable hierarchy is detected. This interconnection topology is then propagated to the participating MLICs to update their tunneling tables. MGRS propagates the prune up its hierarchy until a stable hierarchy level is reached. The MLIC from the Group Membership Deletion site is directed to remove the specified group from its tunneling table.
Multicast transmission continues without further involvement of the site that has left the group.
MGRS Group Membership Addition Group Membership Addition occurs when a site wishes to join the group, or if the initiating site invites a new site to join the group. Once the group membership addition is confirmed, the MGRS for the site wishing to join the group propagates the change up its hierarchy until a stable level is reached. MGRS propagates the join up its hierarchy until a stable hierarchy level is reached. The MLIC from the session connection addition site is directed to add the specified session from its tunneling table. Multicast transmission continues with the new site included in the group.