Chapter 1 Introduction | |
|
|
Table 1-1. Ethernet Frame Structure
MAC
Layer
LLC
Layer
IP Layer
UDP
Layer
Data
Layer
MAC
Layer
Field length (bytes) | Field |
|
|
7 | Preamble |
|
|
1 | SFD |
|
|
6 | Destination MAC Address |
|
|
6 | Source MAC Address |
|
|
2 | Type |
|
|
1 | Vers/HLEN |
|
|
1 | Service Type |
|
|
2 | Total Length |
|
|
2 | Identification |
|
|
1 | Flags/Fragment Offset (most) |
|
|
1 | Fragment Offset (least) |
|
|
1 | Time to Live |
|
|
1 | Protocol |
|
|
2 | Header Checksum |
|
|
4 | Source IP Address |
|
|
4 | Destination IP Address |
|
|
2 | UDP Source Port |
|
|
2 | UDP Destination Port |
|
|
2 | UDP Message Length |
|
|
2 | UDP Checksum |
|
|
... | Payload |
| |
|
|
4 | CRC |
|
|
IEEE 802.1p&q VLAN Tagging (additional 4 bytes if enabled)
Note: The UDP source port field is used to transfer a destination bundle number.
