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Webcast-Catalyst9k
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Spanning Tree

What is the difference between a designated port and a root port on a non-root switch?

2 REPLIES
New Member

Re: Spanning Tree

The root port is the port closest to the root bridge. A designated port is a non-blocking port. The root bridge will have all designated ports.

Here's a crude diagram to clarify:

A (root bridge)

/ \

B---C

The ports on A connecting to B and C are designated ports. The ports on B and C connecting to A are root ports. On the link between B and C, one side is blocking and the other side is fowarding (which side depends on the STP election process). The side which is forwarding is the designated port.

Silver

Re: Spanning Tree

Hi,

This Cisco document on Rapid PVST explains the difference pretty well.

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