[c-nsp] Spanning-tree ports cost Formula
M K
gunner_200 at live.com
Mon Nov 11 04:39:58 EST 2013
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
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