STP question...

TheEditorTheEditor Member Posts: 7 ■□□□□□□□□□
Here is my question.. I understand STP but I came across this example and I swear the solution is wrong.

My question revolves around router 1. The picture shows my solution. My understanding is that STP bases its root port decision on path cost based on speed. Therefore the lowest cost link to the root bridge from Router 1 is through the 2 gigabit links, from Router 1 to Router 4 to Root Bridge.

In the solution I read the gigabit port is blocked on Router 1 and the port from Router 1 to the Root Bridge is forwarding. It's a 100Mbps link.. So that 19.. My solution is 8.

Can someone shed some light on this. .It's driving me crazy.

Thank you


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