Cabletron Systems 9A656-04, Configuration Manual

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Chapter 1: Introduction
Page 1-8 9A656-04/9A686-04 Configuration Guide
The 9A686-04 will always assign itself the default NSAP prefix shown in Figure 1-1 . The
section of the address following the NSAP prefix will be the last 4 bytes of the base MAC
address of the module. The End System Identifier (ESI) will always be the base MAC
address of the module. The 9A686-04 will assign itself a default PNNI level of 72. This
ensures that multiple 9A686-04s installed in the same chassis will automatically belong to
the same peer group (via the default NSAP prefix and level) and will not produce multiple
Nodes with the same Node ID (via the unique base MAC address).
2. The 9A686-04 activates ILMI 4.0, which allows auto configuration. This makes the
9A686-04 capable of using any version of ILMI (3.0, 3.1, or 4.0) that a User, other ATM
switch, or ATM Access device may be using when communicating with the system. Each
interface will become a UNI, IISP or PNNI connection automatically.
3. The 9A686-04 runs the LEC election algorithm. If this module is elected it creates a LAN
Emulation Client (LEC) that is used for management purposes. This LEC then goes
through the following substeps:
a. The 9A686-04 attempts to detect LANE services. It will continue to perform this task
every ten seconds until it receives a response.
b. The 9A686-04 attempts to establish a connection with the well-known LAN Emulation
Configuration Server (LECS).
c. Once a connection is established with the LECS, the 9A686-04 joins the default ELAN.
If management functions are performed via a different ELAN, Local Management
allows the user to specify the ELAN to which the LEC will belong.
4. If there are multiple 9A686-04s in the chassis, an election process occurs where one of the
modules is elected to handle all management requests to the SmartSwitch 9500 chassis.
5. The 9A686-04 begins switching traffic. Connections and their bandwidth requirements are
accepted on a first come, first served basis.