Hi all, quick question about spanning tree, I know it uses cost, I I had say 8 hops to the root bridge from a switch, each one at 1 gig, then 1 hop straight to the root bridge at 100 meg, would It choose the gig path pr the 100 meg direct path, Am I right it saying it would use the lowest overall cost ?
Do not think STP as a routing protocol, end to end.. STPs run only on the bridged network, wherein the switch sees only its neighbouring switch and the BPDU info got from it... anyway, i guess you are talking about the path cost to the root bridge.. Yeah, according to the revised IEEE specification, the switch assigns path cost, based on the speed of the link.
10/1 Gbps - 1
100 Mbps - 10
10 Mbps - 100
and the lowest path cost is normally chosen as the forwarding port.. hence in ur case, the 1 gig link will precede over the 100 Mbps link, unless u forcefully give bridge priorities on the switch. Normally the scenario given by you will not exist, because no one designs the network this way.
Hope this helps.. all the best.. rate replies if found useful.
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