How STP influence the Traffic

How STP influence the Traffic

on the diagram below, PC2 is connected to  Switch SW3 that has a blocked port on the link to SW1. Now Traffic from PC2 to PC1 will it go from SW3 to SW2 then to SW1 or it stiil can go straight from SW3 to SW1 then to PC1

Thank you
stp
jskfanAsked:
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Jeremy WeisingerSenior Network Consultant / EngineerCommented:
It will need to go through switch 2.
Don JohnstonInstructorCommented:
No.  The traffic will go from PC2-SW3-SW2-SW1-PC1.

If you make SW1 the root, that will fix it (assuming the links are the same speed).

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SouljaSr.Net.EngCommented:
I  believe both previous responses are actually in agreement.  The main information missing is which switch is root. base on the diagram Switch 2 must be root as all downstream designated ports are not blocked, so the two previous comments are correct.
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jskfanAuthor Commented:
I agree..I just wanted to make sure the blocked port does not transport traffic from hosts.

is there a way to confirm that when pinging  from PC2 to PC1 it will not take the direction of the blocked port ?
jskfanAuthor Commented:
I mean other than wireshark that might show the directions taken by ICMP (PING),  is the debug able to show that?
Don JohnstonInstructorCommented:
Not from the PC's.  You can look at the MAC address tables or the spanning tree topology on the switches.
SouljaSr.Net.EngCommented:
If you go on the switches and do

sh spanning-tree vlan x

It will show you which ports is forwarding and which are blocked for that vlan.
jskfanAuthor Commented:
Thank you
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