Spanning Tree: Root Bridge Election

What you'll practise

• Identify the current root bridge with show spanning-tree
• Understand root bridge election: lowest bridge priority, then lowest MAC address
• Correct a misconfigured priority so the intended switch becomes root
• Verify the topology reconverges and the expected port starts forwarding

Set it up

1. 1

   Have the node image ready

   Images are not included. The file expects your own licensed copy of:

   • viosl2-adventerprisek9-m.ssa.high_iron_20200929

   If your copy has a different name, open each node's Edit dialog after importing and pick your image from the list.

2. 2

   Copy it to the server and fix permissions

   Replace <your-server> with the IP address or hostname of your EVE-NG or PNETLab server.

   $ scp spanning-tree-root-bridge-lab.unl root@<your-server>:/opt/unetlab/labs/
   # then, logged in to the server:
   $ /opt/unetlab/wrappers/unl_wrapper -a fixpermissions

3. 3

   Open it and start the nodes

   The canvas notes list the objectives, and the workbook walks through the fix.