Map every port on every switch. Track usage, connected devices, VLAN assignments, and port state changes across your entire switching infrastructure.
The Switch Port Mapper (SPM) in Cloudmon provides port-level visibility into network switches using SNMP. It maps which ports are in use, which devices are connected to which ports, what VLANs are assigned, and records a full history of device connection and disconnection events. Navigate to Network → Switch Port Mapper to access the switches list, port details, and port history.
The main Switch Port Mapper page gives an overview of all added switches showing total, used, and available port counts, vendor and category distribution, top utilised switches, and status summaries across the fleet.
Switches can be added to the Switch Port Mapper in two ways. When adding a device under Network → Network Device, if the device supports SPM an Enable SPM option will appear. Enabling this adds it to the SPM module automatically. Alternatively, navigate to Network → Switch Port Mapper → Switches and select Add. Complete the form using the field reference below:
| Field | Description |
| Probe | The Cloudmon probe that will manage discovery and polling for this switch. |
| Hostname / IP | The hostname or IP address of the switch. |
| Display Name | A friendly name for the switch as it will appear in Cloudmon. |
| SNMP Credential | The SNMP credential used to poll port data from the switch. |
| Alarm Rule | An alarm rule to apply to this switch. Optional. |
| Enable Scheduled Scanning | Enable to automatically scan switch ports at a defined interval. |
| Send Report | Enable to receive a report whenever a scan completes and records port changes. |
| Tags | Optional tags for filtering and grouping switches. |
Clicking into a switch opens its detail view with several sections. The Overview tab shows device availability, scan history, downtime, and vendor information such as model, location, and contact details. The Ports tab shows every port on the switch with its admin status, operational status, port speed, connected device, VLAN assignment, and last change timestamp. This gives teams an immediate picture of which ports are in use, which are available, and which have recently changed state.
The Port History tab records every device connection and disconnection event on each port, including the MAC address of the connected device and the timestamp of the event. Port state changes are tracked as well, with filtering options by MAC address, port activity, and switch. This is particularly useful when investigating security incidents, tracing where a specific device has been connected, or auditing port usage over time.
Alarm triggers can be configured per switch to alert on port status changes, such as a port going up or down, and on device connections or disconnections on specific ports. Navigate to the switch detail view and select Alarms to configure triggers. Learn more.
| Symptom | Likely Cause | Fix |
| Switch not appearing after adding | The SNMP credential is incorrect or the probe cannot reach the switch | Verify the hostname or IP, confirm the SNMP credential is valid, and check that UDP port 161 is open between the probe and the switch |
| Ports showing no connected devices | A scan has not been run yet, or the switch has not reported port data | Trigger a manual scan from the switch detail view and wait for results to populate |
| Port History showing no events | Scheduled scanning was not enabled when the switch was added, so no change events have been recorded | Enable scheduled scanning in the switch settings and allow at least one scan interval to pass for events to begin recording |