This read-write value lets an administrator directly override the host-membership aging timeout in milliseconds for this VLAN, rather than relying on the value derived from Robustness, Query Interval, and Max Response Time. An administrator sets this explicitly when the computed default doesn't match the actual multicast application's refresh behavior. For example, setting rlIgmpMldSnoopVlanAdminHostTimeOut to a custom value ensures membership entries persist exactly as long as needed for a specific multicast application's report cadence, rather than the formula-derived default.