Endace DAG 9.2X2 - Page 73

EDM01-36v10 DAG_9.2X2_Card_User_Guide - Data formats
©2010 - 2012 Endace Technology Ltd. Confidential - Version 10 - May 2012 67
wlen
Wire length. Packet length "on the wire" including some protocol overhead. The exact
interpretation of this quantity depends on physical medium. This may contain padding.
extension
headers
Extension headers in an ERF record allow extra data relating to each packet to be transported
to the host. Extension header/s are present if bit 7 of the type field is '1'. If bit 7 is '0', no
extension headers are present (ensures backwards compatibility).
Note:
There can be more than one Extension header attached to a ERF record.
Payload
Payload is the actual data in the record. It can be calculated by either :
• Payload = rlen - ERF header - Extension headers (optional) - Protocol header - Padding
ERF header types
Number Type Description
0:
TYPE_LEGACY
Old style record
1:
TYPE_HDLC_POS
Packet over SONET / SDH frames, using either PPP or CISCO HDLC
framing.
2:
TYPE_ETH
Ethernet
3:
TYPE_ATM
ATM cell
4:
TYPE_AAL5
reassembled AAL5 frame
5:
TYPE_MC_HDLC
Multi-channel HDLC frame
6:
TYPE_MC_RAW
Multi-channel Raw time slot link data
7:
TYPE_MC_ATM
Multi-channel ATM Cell
8:
TYPE_MC_RAW_
CHANNEL
Multi-channel Raw link data. Legacy ERF type - for DAG 3.7T and 7.1S
only.
9:
TYPE_MC_AAL5
Multi-channel AAL5 frame
10:
TYPE_COLOR_HDLC_
POS
HDLC format like TYPE_HDLC_POS, but with the LCNTR field reassigned as
COLOR
11:
TYPE_COLOR_ETH
Ethernet format like TYPE_ETH, but with the LCNTR field reassigned as
COLOR
12:
TYPE_MC_AAL2
Multi-channel AAL2 frame
13:
TYPE_IP_COUNTER
IP Counter ERF Record
14:
TYPE_TCP_FLOW_
COUNTER
TCP Flow Counter ERF Record
15:
TYPE_DSM_COLOR_
HDLC_POS
HDLC format like TYPE_HDLC_POS, but with the LCNTR field reassigned as
DSM COLOR
16:
TYPE_DSM_COLOR_
ETH
Ethernet format like TYPE_ETH, but with the LCNTR field reassigned as
DSM COLOR
17:
TYPE_COLOR_MC_
HDLC_POS
Multi-channel HDLC like TYPE_MC_HDLC, but with the LCNTR field
reassigned as COLOUR
18:
TYPE_AAL2
Reassembled AAL2 Frame Record
19:
TYPE_COLOR_HASH_
POS
Colored PoS HDLC record with Hash load balancing
20:
TYPE_COLOR_HASH_
ETH
Colored Ethernet variable length record with Hash load balancing
21:
TYPE_INFINIBAND
Infiniband Variable Length Record
22:
TYPE_IPV4
IPV4 Variable Length Record
23:
TYPE_IPV6
IPV6 Variable Length Record
24
TYPE_RAW_LINK
Raw link data, typically SONET or SDH Frame
25:
TYPE_INFINIBAND_
LINK
Infiniband link data.
32-47:
-
Reserved for Co Processor Development Kit (CDK) Users and Internal use
48:
TYPE_PAD
Pad Record type
Note:
The Ethernet frame begins immediately after the pad byte so that the layer 3 (IP) header is 32-bit
aligned.