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CHAPTER 5: Monitoring Devices
No Ports: Number of received datagrams that were discarded because the specified port was invalid.
Bytes Received: Number of bytes received.
Bytes Sent: Number of bytes sent.
ICMP Statistics
Messages Received: Number of messages received.
Bad Messages Received: Number of received messages with errors.
Destination Unreachable Messages Received: Number of destination unreachable messages received. A
destination unreachable message is sent to the originator when a datagram fails to reach its intended
destination.
Messages Sent: Number of messages sent.
Destination Unreachable Messages Sent: Number of destination unreachable messages sent. A destination
unreachable message is received by the originator when a datagram fails to be sent to its intended destination.
5.3 Monitoring Capabilities from SNMP
Device monitoring capabilities from SNMP include, among other things:
• Network statistics, defined in RFC 1213, MIB-II.
• Port statistics, defined in RFCs 1316 and 1317.
• Device information, defined in RVS enterprise MIB RVS-DEVICE-INFO.mib.
For more information on the statistics available through the standard RFCs listed above, refer to the RFCs
available on the IETF web site (www.ietf.org). For enterprise MIBs, refer to the description fields in the MIB
text.
5.4 Monitoring Devices from the Command Line
You can issue several commands to monitor devices from the command line:
• display: The “display” command displays real-time information about a device, including:
- General product information including the product name, MAC address, boot, post and firmware versions,
memory usage, utilization and uptime, or the amount of time since the device was booted.
– Memory usage information.
– Serial modem signals.
– Uptime information.
• info: The “info” command displays statistical information about a device over time. Several variations of the
“info” command exist. The screen displays the statistics gathered since the tables containing the statistics
were last cleared. The “info” command displays the following statistics types:
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