RMON Statistics

The Statistics page displays detailed information regarding packet sizes and information regarding physical layer errors. The information is displayed according to the RMON standard. An oversized packet is defined as an Ethernet frame with the following criteria:

  • Packet length is greater than MRU byte size.

  • Collision event has not been detected.

  • Late collision event has not been detected.

  • Received (Rx) error event has not been detected.

  • Packet has a valid CRC.

To view RMON statistics and/or set the refresh rate, complete the following:

Procedure

Step 1

Click Status and Statistics > RMON > Statistics.

Step 2

Select the Interface for which Ethernet statistics are to be displayed.

Step 3

Select the Refresh Rate, which is the time period that passes before the interface statistics are refreshed.

The following statistics are displayed for the selected interface.

RMON Bytes Received (Octets)

Octets received, including bad packets and FCS octets, but excluding framing bits.

RMON Drop Events

Packets dropped.

RMON Packets Received

Good packets received including Multicast and Broadcast packets.

RMON Broadcast Packets Received

Good Broadcast packets received. This number does not include Multicast packets.

RMON Multicast Packets Received

Good Multicast packets received.

RMON CRC & Align Errors

CRC and Align errors that have occurred.

RMON Undersize Packets

Undersized packets (less than 64 octets) received.

RMON Oversize Packets

Oversized packets (over 2000 octets) received.

RMON Fragments

Fragments (packets with less than 64 octets, excluding framing bits, but including FCS octets) received.

RMON Jabbers

Received packets that are longer than 1632 octets. This number excludes frame bits, but includes FCS octets that had either a bad FCS (Frame Check Sequence) with an integral number of octets (FCS Error) or a bad FCS with a non-integral octet (Alignment Error) number. A Jabber packet is defined as an Ethernet frame that satisfies the following criteria:

RMON Collisions

Collisions received. If Jumbo frames are enabled, the threshold of Jabber frames is raised to the maximum size of Jumbo frames.

Frames of 64 Bytes

Frames, containing 64 bytes that were sent or received.

Frames of 65 to 127 Bytes

Frames, containing 65-127 bytes that were sent or received.

Frames of 128 to 255 Bytes

Frames, containing 128-255 bytes that were sent or received.

Frames of 256 to 511 Bytes

Frames, containing 256-511 bytes that were sent or received.

Frames of 512 to 1023 Bytes

Frames, containing 512-1023 bytes that were sent or received.

Frames of 1024 Bytes or More

Frames, containing 1024-2000 bytes, and Jumbo Frames, that were sent or received.

Step 4

To view counters in table view:

  • Click View All Interfaces Statistics to see all ports in table view.