Use the following commands to debug an SPB-managed B-VPLS service:
debug service id svc-id spb
debug service id svc-id spb adjacency [{sap sap-id | spoke-sdp sdp-id:vc-id | nbr-system-id}]
debug service id svc-id spb interface [{sap sap-id | spoke-sdp sdp-id:vc-id}]
debug service id svc-id spb l2db
debug service id svc-id spb lsdb [{system-id | lsp-id}]
debug service id svc-id spb packet [packet-type] [{sap sap-id | spoke-sdp sdp-id:vc-id}] [detail]
debug service id svc-id spb spf system-id