RAD Data comm LRS-24 - Manual (Page 67)

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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