5.9.4.1.2 Monitor Security Switch RMON History

The RMON History Overview page provides an overview of RMON History entries. Each page shows up to 99 entries from the History table, default being 20, selected through the entries per page input field. When first visited, the web page shows the first 20 entries from the beginning of the History table. The first displayed is the one with the lowest History Index and Sample Index found in the History table.

Figure 5-41. RMON History Overview

The RMON History Overview page has the following parameters:

  • History Index: Indicates the index of History control entry
  • Sample Index: Indicates the index of the data entry associated with the control entry
  • Sample Start: The value of sysUpTime at the start of the interval over which this sample was measured
  • Drop: The total number of events in which packets were dropped by the probe due to lack of resources
  • Octets: The total number of octets of data (including those in bad packets) received on the network
  • Pkts: The total number of packets (including bad packets, broadcast packets, and multicast packets) received
  • Broadcast: The total number of good packets received that were directed to the broadcast address
  • Multicast: The total number of good packets received that were directed to a multicast address
  • CRCErrors: The total number of packets received that had a length (excluding framing bits but including FCS octets) of between 64 and 1518 octets, inclusive, but had either a bad Frame Check Sequence (FCS) with an integral number of octets (FCS Error) or a bad FCS with a non-integral number of octets (Alignment Error).
  • Undersize: The total number of packets received that was less than 64 octets
  • Oversize: The total number of packets received that were longer than 1518 octets
  • Frag.: The number of frames whose size is less than 64 octets received with invalid CRC
  • Jabb.: The number of frames whose size is larger than 64 octets received with invalid CRC
  • Coll.: The best estimate of the total number of collisions on this Ethernet segment
  • Utilization: The best estimate of the mean physical layer network utilization on this interface during this sampling interval, in hundredths of a percent