From: Bob Sinclair (bob@bobsinclair.net)
Date: Wed Oct 03 2007 - 22:34:33 ART
Joseph Brunner wrote:
> As a student of Brian's VOL II. Workbook dojo I learned we change stp PORT
> PRI to influence root path selection going downstream (root to leaf), while
> we influence COST to influence root path selection going upstream (leaf to
> root). Just remember COST is added OUT of a port as the BPDU leaves the
> bridge its added.
>
>
Hi Joseph,
Absolutely right about using cost to influence root port selection, but
COST is added as the BPDU arrives, not as the BPDU is sent. I would
refer you to Kennedy Clark's Cisco LAN Switching page 171. Or you
could connect a sniffer to a root bridge and see the cost in the BPDU is
zero.
HTH,
--Bob Sinclair CCIE 10427 CCSI 30427 www.netmasterclass.net
This archive was generated by hypermail 2.1.4 : Fri Nov 16 2007 - 13:11:11 ART