To display MEP groups, use the following command:
show cfm groups {group_name}
# sh cfm groups Group : eapsCfmGrp1 Status : UP Local MEP : 11 port : 41 Remote MEPs : 10 Client(s) : eaps Domain : MD1 Association : MD1v2 Group : eapsCfmGrp2 Status : UP Local MEP : 12 port : 31 Remote MEPs : 13 Client(s) : eaps Domain : MD1 Association : MD1v2