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Cisco MDS 9000 Family Port Analyzer Adapter Installation and Configuration Note
OL-9077-01
Ethernet Frame Addressing Format
Ethernet Frame Addressing Format
This section describes fields in the Ethernet frame, after the adapter encapsulates the Fibre Channel
frame into an Ethernet frame. (See Figure 10.)
Figure 10 Fibre Channel Encapsulation
The following list shows the fields of an Ethernet frame:
• Ethernet Destination Address—The 6-byte MAC address for the frame destination. A broadcast
EDA (FF:FF:FF:FF:FF:FF) is used and cannot be changed.
• Ethernet Source Address—The 6-byte MAC address of the Ethernet port. It cannot be changed. The
source address is burned in at the factory.
• Ethertype field—This field has the value 0x88AE.
• Original packet length—The original packet length is measured in words and is a minimum of 12
words (36 bytes) and a maximum of 528 words (2112 bytes).
SOF
SOF + VSAN
CRC
Cyclic Redundancy Check
End of Frame + Error
Cyclic Redundancy Check
Original Packet Length
EOF +
Eth CRC
FC CRC
EOF
DA Broadcast Destination Addres
s
SA
Ethertype
Start of Frame
Adapter's MAC Source Addre
ss
0x88AE (IEEE Assigned)
FC Frame
(Incl, EISL,
FC Header,
FC Payload)
FC Frame
(Incl, EISL,
FC Header,
FC Payload)
1
05731