PVST (Per Vlan Spanning Tree)

Written by Rene Molenaar on 15 March 2012. Posted in Switching

Scenario:

For this lab you need REAL hardware. You can't use switches in GNS3!

You need at least Catalyst 2950 switches for this lab.

You are the network engineer for a company in Florida that is specialized in campus LAN designs. One of your customers is having issues with their network and it seems their spanning-tree topology has been misconfigured. The network has a number of non-Cisco devices so you need to run an IEEE version of spanning-tree.

Goal:

Ensure all switches run PVST (default on most Cisco switches).
Create VLAN 10,20 and 30 on all switches.
Ensure SW1 is the root bridge for VLAN 10.
Ensure SW2 is the root bridge for VLAN 20.
Ensure SW3 is the root bridge for VLAN 30.
Ensure SW2 prefers the path through SW3 to reach the root bridge in VLAN 10. You are only allowed to change the cost.
Ensure SW3 prefers interface fa0/14 to reach the root bridge for VLAN 10. You are only allowed to change the port priority.
Ensure BPDUs are sent every second for VLAN 20.
Ensure the switches detect a problem in VLAN 30 after 6 seconds of not receiving BPDUs.

IOS:

Basic IOS for the switches should be sufficient. No special features needed.

Topology:

Per VLAN Spanning Tree PVST

Video Solution:

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Related Articles: CCNP Switch Lab
VTP - Vlan Trunking Protocol
Spanning Tree for CCNA
VLANs and Trunks
Private VLAN

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Comments (4)

fey9999
2012-07-04 05:17:10

If you have connected the interfaces SW1 to SW3 like in the picture then at Switch 3 port f0/14 will be the Des FW and NOT f0/13 for VLAN 10

Probably you had connected
SW1 f0/16 --> SW2 f0/13
SW1 f0/17 --> SW2 f0/14

and like in the picture:
SW1 f0/16 --> SW2 f0/14
SW1 f0/17 --> SW2 f0/13

As I understood correctly when selecting root port the Switch checks the Sender(Sw!) port priority to decide.

Do you agree with this?

BR. Marco

snoxoil
2012-09-22 12:22:32

enter your message here...

snoxoil
2012-09-22 12:24:20

It is my understanding that all spanning tree timers do indeed have to be set on the root, how do you explain this anomaly in your video, it puzzled me somewhat

nerciss
2012-12-18 19:59:52

Hello , I have a question about the priority change you have made on the root bridge in order to change the RP on SW 3 for vlan 10.Why the change was made on root bridge .? the election of the root port on a switch if the path cost to the root bridge are identical is not tied by the port priotity on the local switch?

thanks

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