+--------------------------------------------------+
|  RD (8 octets)                                   |
+--------------------------------------------------+
|  Ethernet Segment Identifier (10 octets)         |
+--------------------------------------------------+
|  Ethernet Tag ID  (4 octets)                     |
+--------------------------------------------------+
|  Multicast Source Length (1 octet)               |
+--------------------------------------------------+
|  Multicast Source Address (variable)             |
+--------------------------------------------------+
|  Multicast Group Length (1 octet)                |
+--------------------------------------------------+
|  Multicast Group Address (Variable)              |
+--------------------------------------------------+
|  Originator Router Length (1 octet)              |
+--------------------------------------------------+
|  Originator Router Address (variable)            |
+--------------------------------------------------+
|  Flags (1 octet)                                 |
+--------------------------------------------------+