Reference Guide

Remote Monitoring (RMON)

Remote monitoring (RMON) is supported on the S4820T platform.

RMON is an industry-standard implementation that monitors network traffic by sharing network monitoring information.

RMON provides both 32-bit and 64-bit monitoring facility and long-term statistics collection on Dell Networking Ethernet

interfaces.

RMON operates with the simple network management protocol (SNMP) and monitors all nodes on a local area network

(LAN) segment. RMON monitors traffic passing through the router and segment traffic not destined for the router. The

monitored interfaces may be chosen by using alarms and events with standard management information bases (MIBs).

Implementation Information

Configure SNMP prior to setting up RMON.

For a complete SNMP implementation description, refer to Simple Network Management Protocol (SNMP).

Configuring RMON requires using the RMON CLI and includes the following tasks:

• Setting the rmon Alarm

• Configuring an RMON Event

• Configuring RMON Collection Statistics

• Configuring the RMON Collection History

RMON implements the following standard request for comments (RFCs) (for more information, refer to the Standards

Compliance chapter).

• RFC-2819

• RFC-3273

• RFC-3434

Fault Recovery

RMON provides the following fault recovery functions.

• Interface Down — When an RMON-enabled interface goes down, monitoring continues. However, all data

values are registered as 0xFFFFFFFF (32 bits) or ixFFFFFFFFFFFFFFFF (64 bits). When the interface comes back up,

RMON monitoring processes resumes.

NOTE: A network management system (NMS) should be ready to interpret a down interface and plot the

interface performance graph accordingly.

• Line Card Down — The same as Interface Down (see previous).

• RPM Down, RPM Failover — Master and standby route processor modules (RPMs) run the RMON sampling

process in the background. Therefore, when an RPM goes down, the other RPM maintains the sampled data —

the new master RPM provides the same sampled data as did the old master — as long as the master RPM had

been running long enough to sample all the data. NMS backs up all the long-term data collection and displays

the failover downtime from the performance graph.

• Chassis Down — When a chassis goes down, all sampled data is lost. But the RMON configurations are saved

in the configuration file. The sampling process continues after the chassis returns to operation.

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