ProConnect II® Series

SNMP and RMON Management

Overview

This section describes the Switch’s Simple Network Management Protocol (SNMP) and Remote Monitoring (RMON) capabilities.

RMON is an abbreviation for the Remote Monitoring MIB (Management Information Base). RMON is a system defined by the Internet Engineering Task Force (IETF) document RFC 1757, which defines how networks can be monitored remotely. RMONs typically consist of two components: an RMON probe and a management workstation:

The RMON probe is an intelligent device or software agent that continually collects statistics about a LAN segment or VLAN. The RMON probe trans- fers the collected data to a management workstation on request or when a pre-defined threshold is reached.

The management workstation collects the statistics that the RMON probe gathers The workstation can reside on the same network as the probe, or it can have an in-band or out-of-band connection to the probe.

The Switch provides RMON capabilities that allow network administrators to set parameters and view statistical counters defined in MIB-II, Bridge MIB, and RMON MIB. RMON activities are performed at a Network Management Station running an SNMP network management application with graphical user interface.

SNMP Agent and MIB-2 (RFC1213)

The SNMP Agent running on the switch manager CPU is responsible for:

Retrieving MIB counters from various layers of software modules according to the SNMP GET/GET NEXT frame messages.

Setting MIB variables according to the SNMP SET frame message.

Generating an SNMP TRAP frame message to the Network Management Station if the threshold of a certain MIB counter is reached or if other trap conditions (see next page) are met:

Layer 2 Management 4-Port Gigabit Ethernet Switch

Warm start

Cold start

Link up

Link down

Authentication failure

Rising alarm

Falling alarm

Topology change

MIB-2 defines a set of manageable objects in various layers of the TCP/IP protocol suites. MIB-2 covers all manageable objects from layer 1 to layer 4 and, as a result, is the major SNMP MIB supported by all vendors in the net- working industry. The Switch supports a complete implementation of SNMP Agent and MIB-2.

RMON MIB (RFC 1757) and Bridge MIB (RFC 1493)

The Switch provides hardware-based RMON counters in the switch chipset. The switch manager CPU polls these counters periodically to collect the sta- tistics in a format that complies with the RMON MIB definition.

RMON GROUPS SUPPORTED

The Switch supports the following RMON MIB groups defined in RFC1757:

RMON Statistics Group maintains utilization and error statistics for the switch port being monitored.

RMON History Group gathers and stores periodic statistical samples from the previous Statistics Group.

RMON Alarm Group allows a network administrator to define alarm thresholds for any MIB variable. An alarm can be associated with Low Threshold, High Threshold, or both. A trigger can trigger an alarm when the value of a specific MIB variable exceeds a threshold, falls below a thresh- old, or exceeds or falls below a threshold.

RMON Event Group allows a network administrator to define actions based on alarms. SNMP Traps are generated when RMON Alarms are trig- gered. The action taken in the Network Management Station depends on the specific network management application.

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Linksys PC22604 manual Snmp and Rmon Management, Snmp Agent and MIB-2 RFC1213, Rmon MIB RFC 1757 and Bridge MIB RFC

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