[c-nsp] Spanning-tree ports cost Formula

[M K]

Thanks for the replies , I just wanted to know how these values were extracted or if there was a specific formula like the one used for EIGRP metric or OSPF cost
BR,

> Date: Sat, 9 Nov 2013 21:09:22 +0000
> From: A.L.M.Buxey at lboro.ac.uk
> To: eng_mssk at hotmail.com
> CC: gunner_200 at live.com; cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Spanning-tree ports cost Formula
> 
> Hi,
> >    I think what he is asking for is how try the values were extracted
> 
> they are just default values for different interface types. 
> I dont recall there being any formula (unlike eg OSPF/EIGRP calculations
> on links). cant recall if its CCNA or CCNP SWITCH level stuff:
> 
> Spanning tree port cost (configurable on a per-interface basis—used on interfaces configured as Layer 2 access ports)
> 	
> •10-Gigabit Ethernet: 2
> •Gigabit Ethernet: 4
> •Fast Ethernet: 19 
> 
> 
> obviously this is of interest to those doing >10Gb links... 40Gb and 100Gb
> only appear to have '1' to share ;-)
> 
> alan