SNMP Interface Event Monitor Reference Guide

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Overview

The SNMP Interface Event Monitor watches for changes in the status of each port on your switches, routers, and other devices that support SNMP. It also monitors the error rate on each interface and alerts if these exceed predefined thresholds, providing crucial visibility into network health.

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Use Cases

• Monitoring network interfaces for errors and status changes.
• Detecting fluctuations in operational status and error rates across network interfaces.

Monitoring Options

Configuration

• SNMP Version: Choose from SNMPv1, SNMPv2, or SNMPv3 based on your device compatibility.
• Community: Enter the SNMP community string, typically "public" for SNMPv1 and SNMPv2c.
• Port Number: The standard SNMP port is 161, adjustable if your configuration differs.
• Timeout: Set how long to wait for a response, adjustable based on network performance.
• Retries: Configure retries due to SNMP's UDP-based communication not guaranteeing delivery.

Security Settings (SNMPv3 Only)

• Username: Required for SNMPv3 authentication.
• Context: Optional, used in some SNMPv3 configurations.
• Security Level: Choose from noAuthNoPriv, authNoPriv, or authPriv depending on security needs.
• Auth. Protocol: Options include MD5, SHA, and other SHA variants.
• Auth. Passphrase: Required if authentication is used.
• Privacy Protocol: Choose between DES and AES for encryption.
• Priv. Passphrase: Necessary if encryption is enabled.

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Alerts

• Alert if the device cannot be contacted by SNMP: Configure the severity of alerts if SNMP requests fail.
• Alert if an interface status changes: Notify if an interface's operational status changes (e.g., from up to down).
• Alert if the error rate on any interface exceeds a specified value: Alerts based on error rate calculations involving inbound and outbound errors.

Interface Monitoring

• Include the list of interface statuses in each notification: Optionally include detailed interface status in notifications.
• Filters: Define which interfaces to monitor or exclude by specifying their numeric indexes.

Authentication and Security

• Community String: Required for SNMPv1 and SNMPv2c.
• Username and Passphrases: Required for SNMPv3 with advanced security options.

Protocols

• SNMP

Data Points

• This event monitor generates the following data points:

Data Point	Description
Errors	The total error rate.
Status	The detected status at the time the event monitor last ran.
Incoming Discards	The number of incoming packet discards.
Incoming Errors	The number of incoming errors.
Incoming NUCast	The rate of incoming non-unicast packets.
Incoming UCast	The rate of incoming unicast packets.
Outgoing Discards	The number of outgoing discards.
Outgoing Errors	The number of outgoing errors.
Outgoing NUCast	The rate of outgoing non-unicast packets.
Outgoing Queue Length	The length of the outgoing queue.
Outgoing UCast	The rate of outgoing unicast packets.

Sample Output