Spanning Tree and Root Guard

Categories Cisco
Lab Setup
spanning tree RootGuard question on vPC switches - Network Engineering  Stack Exchange
Notice the placement of RG (Root Guard)
**downstream trunks facing the switches**.

The goal of the lab is to show what happens when a new switch is added to a topology and wins the root bridge election. Generally you don’t want this to occur and should have the primary and secondary root bridge hard coded. Root Guard can be put in place to stop the new switch from becoming the new root for the topology. It will place the port receiving the new better BPDUs in a blocking state. The administrator can then change the root priority to something higher than the original root bridge priority and stop this error from occuring.

https://youtu.be/31IuVFy0b8g

In the next post I will go over how to configure portfast and bpdu guard on access ports. This will stop a new switch added to the network from becoming root bridge if plugged into one of the access ports.

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