Endace DAG 9.2X2 - Erf 2. Type_Eth

EDM01-36v10 DAG_9.2X2_Card_User_Guide - Data formats
68 ©2010 - 2012 Endace Technology Ltd. Confidential - Version 10 - May 2012
ERF 2. TYPE_ETH
Type
Bit 7
1 = Extension header present. See Extension Headers (page 69).
Bits 6:0
Type 2
Short description
TYPE_ETH
Long description
Type 2 Ethernet Record
Use
This record format is for Ethernet [802.3] data links. May be used with EH 12. Channelisation
when created by software.
The TYPE_ETH record is shown below:
The following is a description of the TYPE_ETH record format:
Field Description
Offset
(1 byte)
Number of bytes not captured from start of frame. Typically used to skip link layer headers
when not required in order to save bandwidth and space.
Note:
This field is currently not implemented, contents should be disregarded.
Pad
(1 byte)
The Ethernet frame begins immediately after the pad byte so that the layer 3 [IP] header is 32-
bit aligned.
Payload
(bytes of record)
Payload = rlen - ERF header (16 bytes) - Extension headers (optional) - Padding (2 bytes)