SNMP: setup, interfaces, OIDs, and alerts

Before enabling SNMP

Enable SNMP on the device, restrict it to the Edge Agent or monitoring bridge, and verify firewall and routing. v1/v2c use a community; v3 uses the authentication and privacy settings supported by the device. Prefer v3 and never expose UDP 161 broadly to the Internet.

ISP Dude device setup

Save the device with the correct IP address and Environment first. Enable SNMP, enter the community and click Analyze device. SNMPv1/v2c is checked automatically; existing devices try their saved version first. For SNMPv3, choose dedicated credentials and enter the user, authentication and optional encryption settings.

The same procedure uses the monitoring system assigned to the Environment. Guided analysis requires an online Edge Agent version 0.9.9 or later. The current MikroTik connection supports v1/v2c; interface discovery also depends on the RouterOS version. SNMP must already be enabled on the device: analysis checks access without changing the device configuration.

Retrieve and select interfaces

Analyze device and Refresh analysis also discover interfaces. Select useful ports, up to 20 per device. New ports are not selected automatically. Previous selections remain available even when a partial analysis cannot find every resource. Monitoring changes take effect only after saving the device.

After firmware or interface layout changes, check interface names and indexes again. Traffic, state, speed and alerts retain the settings available in the device form.

Traffic and value formatting

The first successful counter sample establishes a baseline. Later samples are converted into rates and formatted from bits per second through Kbps, Mbps, or Gbps. A single reading cannot provide a traffic rate because no elapsed interval exists yet.

SNMPv2c and v3 prefer 64-bit high-capacity counters; SNMPv1 must account for 32-bit rollover on busy interfaces. Compatible radio interfaces may also expose signal, noise, SNR, and CCQ. Treat missing radio values as unsupported or unavailable until the device and OIDs have been checked.

Interface alerts

Link-state change, negotiation degradation, and abnormal saturation are available. Set saturation percentage and minimum duration from observed normal traffic. Alerts respect the device notification switch and produce open and recovery events.

Discovery and custom OIDs

Results are grouped into System, Network, Performance, Radio, Environment and Power when available. Only recognized categories are shown; a missing category does not prove that the device lacks that capability. Select the desired metrics or use Select recommended. Adding checks is limited to 30 additional metrics, separately from the 20 interfaces. Larger historical configurations remain saveable without adding new metrics.

Show on map is a separate choice. Analysis does not activate new checks: save the selection explicitly. Selected resources remain available when reopening the device. Advanced settings retain custom OIDs, the catalog and manual testing.

Partial analysis shows resources found within its limits. If SNMP data could not be detected from the device appears, the analysis did not obtain usable data. The message reports only the discovery outcome. Saved selections are preserved.

Text or graphics on the map

After enabling Show on map, compatible metrics offer Testo (Text) or Grafico (Graphic). The choice applies to Classic, Professional, NOC / Operational and Topology templates, including public maps. Other metrics remain textual. Save the device to apply the choice.

Under Interfaccia da mostrare sulla mappa (Interface to display on map), choose one monitored port, then Text or Graphic. The node automatically displays download and upload with the port name. Nessuna (None) hides map traffic while keeping selected monitoring checks active. If several ports were visible in the previous configuration, select the desired one before saving. Missing readings remain marked as unavailable. Signal and CCQ quality show the selected resource’s readings even when its name differs in the details; the number in parentheses distinguishes discovered instances. Total RAM shows physical capacity in KB, MB or GB, not memory usage; recognized temperature readings use °C. Total RAM and temperature graphics display their values without implying a utilization percentage.

The technical device identifier is available in analysis details. It does not need to be selected for monitoring.

Graphics display the value and unit with separate labels on a neutral background. A single indicator uses a compact horizontal strip, with its reading on the left and description on the right. Download and upload use distinct arrows, with the port name below. More than three indicators occupy additional rows: displaying many metrics requires more map space.

SNMP in ISP Radius 2.0

Radius 2.0 selects one general SNMP method—Edge Agent or a configured classic MikroTik bridge—for manual and automatic polling. It does not choose a separate Agent per account and does not silently fall back when the selected Agent is unavailable.

Checklist

• Restrict SNMP sources
• Prefer v3 where supported
• Verify version and credentials
• Select useful interfaces only
• Refresh ifIndex after device changes
• Wait for two samples before evaluating speed
• Tune threshold and duration
• Test custom OIDs
• Diagnose timeouts rather than guessing