40Remote Monitoring (RMON)RMON is an industry-standard implementation that monitors network traffic by sharing networkmonitoring information. RMON provides both 32-bit and 64-bit monitoring facility and long-termstatistics collection on Dell Networking Ethernet interfaces.RMON operates with the simple network management protocol (SNMP) and monitors all nodes on alocal area network (LAN) segment. RMON monitors traffic passing through the router and segment trafficnot destined for the router. The monitored interfaces may be chosen by using alarms and events withstandard management information bases (MIBs).Implementation InformationConfigure 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 HistoryRMON implements the following standard request for comments (RFCs) (for more information, refer tothe Standards Compliance chapter).• RFC-2819• RFC-3273• RFC-3434• RFC-4502Fault RecoveryRMON provides the following fault recovery functions.• Interface Down — When an RMON-enabled interface goes down, monitoring continues. However, alldata values are registered as 0xFFFFFFFF (32 bits) or ixFFFFFFFFFFFFFFFF (64 bits). When the interfacecomes back up, RMON monitoring processes resumes.NOTE: A network management system (NMS) should be ready to interpret a down interface andplot 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 RMONsampling process in the background. Therefore, when an RPM goes down, the other RPM maintainsthe sampled data — the new master RPM provides the same sampled data as did the old master — as756 Remote Monitoring (RMON)
