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11-10
C
11: ATM N
HAPTER
Interim Local
Management
Interface (ILMI)
Communication
Protocol
ILMI Management
Information Base
(MIB)
ATM Address
Registration
ETWORKS
receiving data, the SAR reassembles the contents of the ATM cell
information fields into the higher-layer protocol data units.
The ILMI communication protocol is an open management protocol that
supports the bi-directional exchange of management information between
all end-stations and the switches to which they are connected.
The ILMI functions for a UNI provide status, configuration, statistics, and
control information about virtual path and virtual channel connections
available at the UNI. In addition, the ILMI provides for address registration
across the UNI. ILMI communications use SNMP directly over AAL5.
Managed objects are accessed through the Management Information Base
(MIB). The ILMI MIB provides the management application with the
capability to control and monitor the ATM link and physical layer.
LANplex Switching software version 8.1.1 supports all items identified for the
user-side device in a private UNI as defined in the UNI 3.0 specification, plus
additional objects listed in UNI version 3.1 for the ILMI MIB.
A User-to-Network Interface (UNI) Management Entity (UME) implements
the management interface to the ATM network. Each ATM port has one
UME, which manages the network prefix and address tables and provides
access to the Interim Local Management Interface (ILMI) MIB.
To establish an ATM connection at the UNI, both the user and the network
must know the ATM addresses that are in effect at that UNI. These ATM
addresses are used in signaling messages to establish connections with ATM
end-stations. The address registration procedure provides the means for the
dynamic exchange of addressing information between the user and the
network at the UNI.
To exchange address information, two MIB tables are defined. One contains
network prefixes of the ATM switches, while the other contains registered
ATM addresses for each end-station. The user side implements the network
prefix table, and the network side creates and deletes entries in the table in
order to register and de-register ATM addresses.
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