From: Bob Sinclair (bsinclair@netmasterclass.net)
Date: Thu Mar 18 2004 - 14:47:37 GMT-3
William,
The Root Path Cost is the sum of the cumulated path cost plus the INGRESS
cost. The cumulated cost is zero exiting the root bridge. Switch B will
see a root path cost of 10.
HTH,
Bob Sinclair
CCIE #10427, CISSP, MCSE
www.netmasterclass.net
----- Original Message -----
From: "William Chen" <kwchen@netvigator.com>
To: <ccielab@groupstudy.com>
Sent: Thursday, March 18, 2004 12:41 PM
Subject: STP Path Cost.
> Dear all,
>
> I just forget how the path cost of STP is derived from. For example
>
> Root Switch (Cost 1) ------------ (Cost 10) Switch B.
>
> That means Root Switch have the interface set to cost 1, but Switch B
set
> the cost to 10, and it is asymetric.
>
> Question: What is the root path cost of Switch B, 1 or 10?
>
> Best Regards,
> William Chen
>
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