Before Configuring Your Atm Mda - Nortel BayStack 450-24T Using Manual

Using the BayStack 450 10/100/1000 Series Switch

Before Configuring Your ATM MDA

Your BayStack 450-2M3/2S3 MDA has two physical OC-3 ports (A1 and A2).
Each of the physical ports are logically mapped to four LAN emulation clients
(LECs) by default (LEC1 to LEC4).
The LECs can be thought of as virtual ports that perform data forwarding, address
resolution, and other control functions over asynchronous transfer mode (ATM).
The default values for the four LECs are Disabled. You cannot enable the LECs
without assigning them to a VLAN. After you assign the LECs to a VLAN, the
LECs become virtual ports (VPorts) and show up in the appropriate CI screens as
if they were a continuation of the switch's normal port population. For example, in
a 24-port switch, the four VPorts appear in the CI screens as ports 25 to 28.
You can assign any of the four LECs to either one of the two physical ports to suit
your network needs (for example, you can assign LEC2 and LEC3 to physical port
A1 while LEC 1 and LEC 4 are assigned to physical port A2). The LECs must be
assigned to a VLAN on the switch in order to function properly.
Note: When you configure your LECs using the following screen examples
and tables, you will be instructed to use the VLAN Configuration screen to
assign the appropriate LEC virtual port number to a VLAN.
See "VLAN Configuration" on page 3-46 for help in assigning VPorts to a
VLAN.
See Appendix D, "ATM Overview," for an overview of ATM concepts and
terminology that relate to the BayStack 450-2M3/2S3 MDA. That appendix also
provides tips you can use when configuring your BayStack 450-2M3/2S3 MDA.
See Appendix E, "Quick Steps to Features," for flowcharts that detail the steps
required to configure your BayStack 450-2M3/2S3 MDA.
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