RAD Data comm LRS-24 Handling of Management Communication

LRS-24 Installation and Operation Manual Chapter 4 Management via the CM-2 Module

Introduction 4-3

• Identification of Failures – automatically identifies failure of the management

communication, and enables alternate management modes, in accordance

with the following priorities:

− Network management stations

− Supervision terminal

− For a module without internal SNMP agent–allows remote configuration in

accordance with the parameters of the remote module connected in a link

with the LRS-24 module.

When communication with a management function with higher priority is

restored, the management capabilities are automatically returned to it.

• Routing – routes the management traffic received through the various ports to

its intended destination (module), and processes the messages received from

the modules for transmission through the appropriate management port.

• Format – automatically translates the format of the incoming and outgoing

messages to the internal management protocols used by various modules.

Moreover, when simultaneous access is attempted, the CM-2 module

arbitrates handling management requests according to a built-in system of

priorities.

• Manages Hub Functions – manages the general hub functions

(for example, power supplies).

• Data Storage – stores LRS-24 configuration data in non-volatile memory.

Handling of Management Communication

The services provided by the CM-2 module depend on the type of management

communication (ASCII terminal, network management station, or remote module)

and the type of modules (with or without internal SNMP agent) which are

addressed by the external management function.

Internal handling of the SNMP management communication is as follows:

• Modules with Internal SNMP Agent – the internal protocol is SNMP over

SLIP. (However such modules also include management software for directly

operating an ASCII terminal).

Routing of SNMP messages is made in accordance with IP addresses assigned

to the various modules by the CM-2 module, which provides their initialization

parameters.

Refer to Appendix C for additional information.

Terminal messages are routed directly to the addressed module. After the

addressed module starts communicating with the terminal, it takes control and

the terminal then operates under direct control of that module.

• Modules without Internal SNMP Agent – a proprietary protocol is used for

internal management communication. SNMP messages are accepted through

the dedicated management (Ethernet) interface, are converted to the

proprietary protocol, and routed to the slot with the desired module. The

CM-2 module serves as a proxy agent for these modules.

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