lfa(7)lfa(7)NAMElfa - DAPCA/DAPBA Asynchronous Transfer Mode (ATM) Network Interface
The lfa interface can be either the ATM HE622 ATM adapter (DAPCA) or
the ATM HE155 ATM adapter (DAPBA), providing transmission rates of 622
megabits per second and 155 megabits per second, respectively. Both
adapters use the same driver.
The lfa driver controls the transmission and reception of data across
the ATM network over specified Virtual Circuits (VCs). The creation
and management of the VCs is controlled by the ATM subsystem software
that sits above the driver. When the driver is started, it registers
with the ATM subsystem and then performs any task that the subsystem
Note that the transmission rate of the link is not the same as the
transmission rate as seen by a user application. The following factors
can contribute to this: the speed of the Peripheral Component Intercon‐
nect (PCI) bus, the signaling overhead on the link medium itself, the
speed of the host processor, and other activity in the system (espe‐
cially on the same PCI bus).
See the sys_attrs_lfa(5) reference page for a list of thelfa subsystem
The following diagnostic and error messages contain relevant informa‐
tion provided by the lfa interface, and are displayed on the console.
Each message begins with the adapter identification, including the
adapter number (for example, lfa0). Ensure that either a HE622 or
HE155 ATM adapter is installed in the system and that it is a DAPBA-FA,
DAPBA-UA, or DAPCA-FA. The specified adapter failed its initialization
due to insufficient memory resources. This could possibly happen if
kernel memory debugging was enabled in the /etc/sysconfigtab file. If
this message is displayed, the adapter will not operate. The driver
failed when it tried to register itself with the ATM subsystem because
the optional ATM components are not configured in the kernel. Recon‐
figure your kernel with the the ATM, UNI3X, ATMIP, and LANE options.
See Asynchronous Transfer Mode for more information. An error occurred
when trying to gather the resources necessary (for example, memory for
data structures and specified bit rate for transmission) to set up a
Virtual Circuit (VC). An invalid VPI or VCI value was passed to the VC
activation routine. Ensure that the values specified fit into the
range given for the num_vpi_bits attribute described in the "Subsystem
Attributes" section. A request to delete a VC was made and the VC was
transmitting. This condition did not go away after 1 second so the VC
will be deleted anyway. It is possible that the VC's state is incon‐
sistent, and that this may indicate a problem with the driver.
Informational messages contain information provided by the lfa driver.
These messages are printed on the console and begin with the adapter
identification, including the adapter number. The driver successfully
configured and registered itself with the ATM subsystem software. The
connection either to a switch or to another system (in a point-to-point
configuration) exists. This message is displayed after the driver is
initially brought up. If it is not displayed, it is likely there is a
problem with the cables. The connection either to a switch or to
another system existed, but no longer exists. An administrator issued
a command to shut down the adapter. If you do not see this message,
the adapter is still operational. To shut down the adapter, use the
atmconfig down command.
Commands: netstat(1), atmarp(8), atmconfig(8), atmelan(8), atmsig(8),
NetworkInformation: arp(7), inet(7), intro(7)
Asynchronous Transfer Mode
Network Administration: Connections