---
type: Monitoring Guide
title: "SNMP Switch Monitoring: Per-Port Traffic & Status"
description: "Monitor a switch with SNMP — per-port traffic, errors, ifOperStatus vs ifAdminStatus, ifIndex-to-port mapping, uplink saturation and PoE via POWER-ETHERNET-MIB."
resource: "https://snmp-monitoring.info/monitoring/network/switch/"
tags: [monitoring]
timestamp: 2026-07-11T00:00:00Z
---

# SNMP Switch Monitoring: Per-Port Traffic & Status

Monitor a switch with SNMP — per-port traffic, errors, ifOperStatus vs ifAdminStatus, ifIndex-to-port mapping, uplink saturation and PoE via POWER-ETHERNET-MIB.

## Related concepts

- Up: [SNMP Network Monitoring: Interfaces, Bandwidth & Errors](/monitoring/network/index.md)

## Frequently asked questions

### How do I monitor switch ports with SNMP?

Walk the IF-MIB across the switch: ifOperStatus for link state, ifHCInOctets/ifHCOutOctets for per-port traffic, and ifInErrors/ifOutErrors for health. Map each ifIndex to a port label via ifName so alerts name a real port, and cross-check ifAdminStatus so you don't alert on intentionally shut ports.

### How does ifIndex map to a physical port?

It doesn't map directly — ifIndex is an arbitrary integer, not the faceplate number. Walk ifName (1.3.6.1.2.1.31.1.1.1.1) and ifDescr and join them to the shared ifIndex to get the label. Because indexes can change across reboots or stack changes, rebuild the map periodically.

### What OID is switch port status?

ifOperStatus (1.3.6.1.2.1.2.2.1.8) reports the operational link state — up, down or testing. Pair it with ifAdminStatus (1.3.6.1.2.1.2.2.1.7), which tells you whether a down port was administratively shut or genuinely failed.

### Can SNMP monitor PoE on a switch?

Yes, through the POWER-ETHERNET-MIB, which exposes per-port power status and draw so you can watch the power budget and catch a port that stopped supplying an AP, phone or camera. The exact leaf objects vary by vendor, so confirm what your switch exposes.

## Source

Concept generated from https://snmp-monitoring.info/monitoring/network/switch/ — the SNMP Monitoring vendor-neutral knowledge base. Content is limited to what that page states (no external claims added here).