Status and Statistics
RMON
Cisco 500 Series Stackable Managed Switch Administration Guide 30
2
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:
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.
• Bytes Received—Octets received, including bad packets and FCS octets,
but excluding framing bits.
• Drop Events—Packets dropped.
• Packets Received—Good packets received, including Multicast and
Broadcast packets.
• Broadcast Packets Received—Good Broadcast packets received. This
number does not include Multicast packets.
• Multicast Packets Received—Good Multicast packets received.
• CRC & Align Errors—CRC and Align errors that have occurred.
• Undersize Packets—Undersized packets (less than 64 octets) received.
• Oversize Packets—Oversized packets (over 2000 octets) received.
• Fragments—Fragments (packets with less than 64 octets, excluding
framing bits, but including FCS octets) received.
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