When ASM group filtering is enabled, then for groups in the ASM space the local router will: - process PIM (*,G) Join and (S,G) Join messages received on this interface only if the group address is included in the standard access list corresponding to the list index value configured for this object - only send PIM (*,G) Join and (S,G) Join messages over this interface if the group address is included in the standard access list corresponding to the list index value configured for this object. Local membership requests from the MGMD Router component are not filtered. These should be filtered by the MGMD Router component. In other words, the standard access list is a whitelist of the ASM groups for which DC-PIM is permitted to request or receive traffic over the interface. rlPimInterfaceAsmGrpFilter defaults to an empty string, which indicates that no access list is specified. If the name does not correspond to a valid access list, no group addresses will match the list and therefore all PIM (*,G) Join and PIM (S,G) Join messages will be filtered.