+-----------------------------------------+
                |  RD (8 octets)                          |
                +-----------------------------------------+
                |  Ethernet Segment Identifier (10 octets)|
                +-----------------------------------------+
                |  Ethernet Tag ID (4 octets)             |
                +-----------------------------------------+
                |  MAC Address Length (1 octet)           |
                +-----------------------------------------+
                |  MAC Address (6 octets)                 |
                +-----------------------------------------+
                |  IP Address Length (1 octet)            |
                +-----------------------------------------+
                |  IP Address (0, 4, or 16 octets)        |
                +-----------------------------------------+
                |  MPLS Label1 (3 octets)                 |
                +-----------------------------------------+
                |  MPLS Label2 (0 or 3 octets)            |
                +-----------------------------------------+