Section: Maintenance Commands (8)
Updated: Nov 17, 1998
mpcd - ATM MPOA (Multi-Protocol Over ATM) client daemon
Control ATM address
Data ATM address
MPS control ATM address
MPS MAC address
(MPC) is responsible for creating and receiving
internetwork layer shortcuts. Using these shortcuts MPCs forward
unicast internetwork layer packets effectively over ATM without need
for routing protocols.
has two roles; ingress and egress. In ingress role
detects flows destined outside it's own subnet and tries to establish
shortcuts to those destinations. In egress role
accepts shortcuts and packets arriving on those shortcuts. Maintaining
shortcuts is done with the help of
Just as the Linux
client is also divided in two parts. The parts are kernel component
and a daemon process. The daemon opens and receives data shortcuts and
control connections with the kernel component. The kernel component
tallies packets flowing out from the
device and makes the decision if a packet should be forwarded using
If the daemon is killed with
it will close all the open connections, purge ingress and egress cache
if applicable and then restart itself.
Linux MPOA client only supports non-LLC-muxed shortcuts. The number of
supported MPOA clients is unlimited.
- -s Control ATM address
Local ATM address this MPC uses for MPOA control connections.
- -l Data ATM address
Local ATM address from and to which MPOA shortcuts are established.
- -c MPS control ATM address
ATM address of MPS. Only needed if MPS can not advertise it by itself.
- -i Interface number
The interface number of LEC this MPC serves. E.g. 2 for "lec2".
- -m MPS MAC address
MAC address of default router where MPS recides. Only useful if the
MPOA server fails to advertise itself.
- -L LEC address
Listen address of the
client zeppelin. mpcd uses this address as its own
address when it queries
configuration parameters. If this option is not present then mpcd
to query for configuration parameters. This option is normally the
same as zeppelin's -l option.
- -n ELAN name
Name of the
for which mpcd asks for parameters when it connects to
If this option is not given,
should respond with parameters belonging to the default
if one exists. This option is normally the same as zeppelin's -n
- -C LECS address
ATM address of
mpcd asks for parameters. If this option is left empty and -L is
given, mpcd uses ATM Forum assigned Well-Known
address. This option is normally the same as zeppelin's -c option.
This script snippet shows how to run LANE and MPOA. After UNI
signalling and ILMI have been started LANE (zeppelin) and MPOA (mpcd)
are started. The commented out line shows how to start mpcd so that it
Arguments jaarli[1-3] are local ATM addresses listed in file
case "$1" in
if [ -x sigd/atmsigd ] ; then
if [ -x ilmid/ilmid ] ; then
ilmid/ilmid -b -x
if [ -x led/zeppelin ] ; then
led/zeppelin -2 -n sampo -i2 -l jaarli3 &
ifconfig lec2 10.10.10.208 \
netmask 255.255.255.192 \
ifconfig lec2 up
route add default gw 10.10.10.193
if [ -x mpoad/mpcd ] ; then
mpoad/mpcd -i2 -s jaarli1 -l jaarli2 &
#mpoad/mpcd -i2 -s jaarli1 -l jaarli2 \
-L jaarli3 -n sampo &
Supports only Ethernet type of ELANs. Probably others too.
Heikki Vatiainen <firstname.lastname@example.org
>, Sampo Saaristo <email@example.com