Compaq SW3323, SW3324, SW3322 manual Port Mirroring, 12Overview

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1-12Overview

RMON

RMON (Remote Monitoring) is a facility used to manage networks remotely while providing multi-vendor interoperability between monitoring devices and management stations. An SNMP MIB defines RMON. This MIB is divided into nine different groups, each gathering specific statistical information or performing a specific function. RMON-capable devices gather network traffic data and then store them locally until downloaded to an SNMP management station.

The switch supports four of the nine groups of RMON defined for Ethernet networks on a per port basis. Specifically, these are:

nStatistics: a function that maintains counts of network traffic statistics such as number of packets, broadcasts, collisions, errors, and distribution of packet sizes.

nHistory: a function that collects historical statistics based on user- defined sampling intervals. The statistical information collected is the same as the Statistics group, except on a time stamped basis.

nAlarm: a function that allows managers to set alarm thresholds based on traffic statistics. Alarms trigger other actions through the Event group.

nEvent: a function that operates with the Alarm group to define an action that will be taken when an alarm condition occurs. The event may write a log entry and/or send a trap message.

RMON Statistics group information is displayed on the Port Statistics Screen in the console menus. Additional RMON functionality is available via SNMP.

Port Mirroring

The switch includes the ability to mirror the traffic being switched on any port for purposes of network traffic analysis and connection integrity. When this feature is enabled, a protocol analyzer or RMON probe is connected to any port in a group of eight. This port is configured to mirror the traffic from any other port in the same group of ports. The groupings are ports 1-8, 9-16 and 17-24. You can only mirror one port to another port at one time. Port mirroring occurs at the same speed configured for the port (10Mb/s-to-10Mb/s or 100Mb/s-to- 100Mb/s). Port mirroring is configurable in the Switch Configuration Menu using the console menus or via SNMP.

NOTE: Port mirroring is not supported on the Gigabit Ethernet ports.