Enterasys Networks VH-4802 manual Rmon, Port Mirroring

•SNMP-based network manager, in-band

The system can also be managed using SNMP, the most common protocol used today for network management. Standard agent MIBs embedded in the switch provide basic SNMP management through industry-standard SNMP applications.

Management security protection is provided based on SNMP community names. See Chapter 4, “SNMP Management,” in the Management Guide for more information.

RMON

RMON (Remote Monitoring) is a facility used to manage networks remotely while providing multi-vendor interoperability between monitoring devices and management stations. RMON is defined by an SNMP MIB. 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 VH-4802 supports four of the nine groups of RMON defined for Ethernet networks on a per segment basis. Specifically, these are:

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

•History: 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.

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

•Event: 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.

Note that RMON statistics and other information can only be viewed using a connection to the on-board Web agent or via other compatible SNMP management applications.

Port Mirroring

The VH-4802 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 can be connected to the mirror port. You can only mirror one port to another port at one time. Port mirroring occurs at the same speed configured for the port (10Mbps-to-10Mbps or 100Mbps-to-100Mbps). Port mirroring is configurable using the console interface menus, the on- board Web agent, or via SNMP.

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