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LOWEST ROOT PATH COST

Posted on 2011-02-27
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Last Modified: 2012-05-11
Im aware that a manual entry can be used to add 'cost' values for each cable being used ie for fibre or cat 5-7 etc

cost 19 - 100mbps
cost 100 - 10 mbps
cost 2 - 1Gps
cost 4 - 4 Gps

is this just used for those that want to actually view a manual entry for troubleshooting/realisation etc or is there something specific to this?

Unless it is down to type of hardware being used and maybe IOS!!

Just a 'USELESS' question needed to ask and would just be nice to know!
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Question by:mikey250
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David earned 2000 total points
ID: 34991896
Wow, spanning trees .. haven't had to even think about them since the 80's.   If you only have one path from A -> B anywhere, then the values aren't used in the first place.  These settings only come into play if there is more than one connection between any two ports, so the idea here is that you tell the router, hub, switch the preferred (i.e fastest, or least cost) way of getting there.  Modern equipment can figure this out automatically, but gear from the 80's can't
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by:mikey250
ID: 34991951
ok, so as long as i remember the older the equipment then i may or may not see 'cost' values!! understood!
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by:David
David earned 2000 total points
ID: 34991977
right.. the ancient equipment didn't have any adaptive spanning tree algorithms, so you had to be really careful not to create multiple paths .. but if you had to have then you needed to weight them properly or traffic would go down an undesirable path .. or worse, you wouldn't get any
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by:mikey250
ID: 34991984
perfect!!
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by:David
ID: 34992013
to clarify ... cost on the old stuff was assigned by a human via any arbitrary scale.  
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