tmnxOamBuildPktEthCtlEntry contains the definition of one Ethernet header used by the OAM Egress Finder. Fields that influence the routing by SROS of a packet containing an Ethernet header (e.g. Source MAC) are present. The other Ethernet header fields (e.g. Frame Check Sequence) are absent. A row is created by SROS when: 1. tmnxOamBuildPktHdrType is set to 'ethernet', OR 2. A tmnxOamBuildPktHdrOvrCtlTable table row is created with a tmnxOamBuildPktHeaderNum index which refers to a header with type 'ethernet'. A row is destroyed by SROS when: 1. A tmnxOamBuildPktHdrCtlTable row with tmnxOamBuildPktHdrType = 'ethernet' is destroyed, OR 2. A tmnxOamBuildPktHdrOvrCtlTable row which refers to a header with type 'ethernet' is destroyed. A row created using creation clause 1, above, has the index object tmnxOamBuildPktNumOrZero=0. The zero indicates the Ethernet 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 Source MAC field for header 1, and two overrides. Pkt Num Or Zero Header Num Src MAC Addr 0 1 00:11:22:33:44:55 10 1 00:12:34:56:78:9a 255 1 00:AA:BB:CC:DD:EE