Endace DAG 9.2X2 - Auto_Neg; Noauto_Neg; Buffer_Size; Crc32; Nocrc; Default

EDM01-36v10 DAG_9.2X2_Card_User_Guide - Configuring the DAG card
26 ©2010 - 2012 Endace Technology Ltd. Confidential - Version 10 - May 2012
auto_neg / noauto_neg
Note:
From DAG software 3.1.0 onwards nic/nonic is replaced by auto_neg/noauto_neg . Both options are
valid and still can be used. auto_neg/noauto_neg is not supported by some older cards.
For 1G Ethernet only. The DAG card operates in either “auto_neg” or “noauto_neg” mode.
In
auto_neg mode you must connect the DAG card directly to a Ethernet switch or card with a full-duplex
cable, in which case the DAG card will perform Ethernet auto-negotiation.
The
noauto_neg mode is intended for use with optical fiber splitters. In this mode you must connect the
receive socket of the DAG port to the output of an optical splitter inserted into a network link between
two other devices. The transmit socket of the DAG should be unconnected.
In
noauto_neg mode, Ethernet auto-negotiation is not performed. This allows you to use one splitter on
each DAG receive port to monitor each direction of a full-duplex Ethernet link.
Example
dagconfig auto_neg
dagconfig noauto_neg
buffer_size
The buffer size= n MB indicates the total amount of memory allocated to the DAG card. Memory allocation
occurs at boot time.
In Linux operating systems
dagmem is used to allocate the memory to each installed DAG card. For details on how to allocate
memory, refer to
EDM04-32 dagmem Software Guide .
In Windows operating systems
Memory is allocated using the DAG Devices tool For details on how to allocate memory, refer to EDM04-
37 Windows DAG Software Installation Guide
.
For information on calculating the required stream buffer size, see Guidance for stream buffer sizing
(page 71).
crc32 / nocrc
Enables CRC checking on the DAG card which allows detection of corrupted data within the entire frame.
Sets the checking to None or 32 bits.
Example
dagconfig nocrc
dagconfig crc32
Note:
Only applicable to 1G Ethernet - Not applicable to 10G Ethernet LAN or WAN.
default
The default command initializes the DAG card configuration and sets all operational settings to the
default network mode values. The command also undoes any user customizations and resets the DAG
card configuration back to its default state.
Note:
When you run dagconfig -dX default the dagclock inputs and outputs are also reset to defaults.
(Where X is the device number of the DAG card you want to configure).
Example
dagconfig -d0 default