tmnxOamBuildPktL2tpCtlEntry contains the definition of one L2TP header used by the OAM Egress Finder. Fields that influence the routing by SROS of a packet containing an L2TP header (e.g. Tunnel ID) are present. The other L2TP header fields (e.g. Version) are absent. A row is created by SROS when: 1. tmnxOamBuildPktHdrType is set to 'l2tp', OR 2. A tmnxOamBuildPktHdrOvrCtlTable table row is created with a tmnxOamBuildPktHeaderNum index which refers to a header with type 'l2tp'. A row is destroyed by SROS when: 1. A tmnxOamBuildPktHdrCtlTable row with tmnxOamBuildPktHdrType = 'l2tp' is destroyed, OR 2. A tmnxOamBuildPktHdrOvrCtlTable row which refers to a header with type 'l2tp' is destroyed. A row created using creation clause 1, above, has the index object tmnxOamBuildPktNumOrZero=0. The zero indicates the L2TP header is a base definition (not an override). A row created using creation clause 2, above, has tmnxOamBuildPktNumOrZero set to the tmnxOamBuildPktNum index of the parent tmnxOamBuildPktHdrOvrCtlTable row. The following example values for this table show the definition of a base Tunnel ID field for header 1, and two overrides. Pkt Num Or Zero Header Num Tunnel ID 0 1 65533 10 1 65534 255 1 65535