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IntermediatePublished 2026-07-04

SNMP Trap Notifications to the NMS

Bundle lab

Configure a Cisco IOS router (R1) to proactively send SNMPv2c trap notifications to a centralized NMS host. Learners practice the difference between polling and traps, add the trap destination and enable device-initiated notifications, and verify deterministically with show commands. Flat L2-only management LAN; no routing, no VLAN/STP complexity.

Track
Est. time
35 minutes
Difficulty
Intermediate
Topics

Learning objectives

  • Explain polling vs. traps and why traps accelerate fault detection
  • Configure SNMP trap destination with 'snmp-server host <ip> version 2c <community>'
  • Enable device-initiated notifications with 'snmp-server enable traps'
  • Verify trap configuration using 'show snmp host' and 'show snmp'
  • Confirm basic IP reachability to the NMS over a flat management LAN

Troubleshooting focus

  • No traps received due to missing 'snmp-server enable traps'
  • Wrong NMS IP or wrong SNMP version on 'snmp-server host'
  • Community string mismatch between device traps and NMS listener
  • No basic IP reachability to the NMS (wrong interface IP, shutdown port, bad cabling)
  • Misinterpreting polling success as traps working (polling can succeed while traps fail)

Topology

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Grade your work

How this lab is graded
  • Build it your way. Where a lab lets you choose a value — a VLAN name, an interface description — grading checks that you configured it, not which name you picked. Names that another line has to reference, like an ACL applied with access-class, are stated in the guide and do have to match.
  • Addresses, modes and protocol keywords are exact. An IP address, a subnet mask, switchport mode trunk, an encapsulation — these carry the meaning of the lab, so they are graded as written in the guide.
  • Grading reads your saved configuration. Export the lab from CML after you have configured it, and make sure anything you set is in the running-config — a change that only exists in a terminal session never reaches the grader.
  • You can submit as many times as you like. Your best score stands, and each attempt tells you which checks passed so you can work the gaps.
  • Scored something you believe is correct? Use Report an issue on this page — that is exactly how the grading fixes in the changelog got found.

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