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How to Verify the Traffic is going through Root Bridge

jskfan
jskfan asked
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Last Modified: 2014-11-18
I have the topology shown below. I can ping from R1 to R2 and back. SW1 is the Root Bridge, If I understand all traffic goes through RB, but how do I verify that when pinging between routers ?

Thanks
SR
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Neil RussellTechnical Development Lead

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Why would ALL traffic go through the root bridge?  on a large network that would be a huge bottleneck!
The root bridge is just a root for calculating the "Tree".
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I thought the Root Bridge is the one that traffic goes through....I mean all other switches forward traffic to it...
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So if I understand you Guys, Root Bridge will handle Broadcast "Traffic" only ?
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What do the BPDUs carry as traffic type? are they used just for keep alive of the switch ports ?
initially I thought you determine the Root Bridge in function of how you want to route the traffic...
for instance in the topology I posted, SW1 is the Root Bridge, and it would be efficient to make SW2 or SW4 as the RB , and it would be the short path from R1 to R2
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Ok what I can retain from this discussion is: STP and Root bridge has nothing to do in the decision of which path the traffic will take...they are just there to prevent the Loop..

So if you have a design that has Access switches/Distribution/ and core switches, where would you put the Root Bridge? does it matter where ?
Don JohnstonInstructor
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Ok what I can retain from this discussion is: STP and Root bridge has nothing to do in the decision of which path the traffic will take...they are just there to prevent the Loop..
Well, by preventing the loop, you are also affecting the traffic path.
So if you have a design that has Access switches/Distribution/ and core switches, where would you put the Root Bridge?
In a location that allows an optimal traffic path for most traffic.

Author

Commented:
Well, by preventing the loop, you are also affecting the traffic path.

In the topology I posted above, let's say the ICMP traffic going from R1 to R2 (Pinging from R1 to R2), but SW4 has interface E2/2 facing SW2 in Blocking mode(STP). will the ICMP traffic go SW4 then SW3 then SW1 then SW2 to reach R2 ?

OR

ICMP traffic does not care about STP Blocked Port ?
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If SW2 port e2/2 is blocking then the only path for any traffic between R1 and R2 is through SW4-SW3-SW1-SW2.

Good...
I believe Traceroute will verify that ?
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Thanks Don.

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Thank you All !!

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