From: Rob Webber (rwebber@xxxxxxxxxxxx)
Date: Tue May 15 2001 - 10:27:55 GMT-3
I don't think this is a dumb question - many people don't fully understand
Spanning Tree.
No, all traffic does not have to flow through the root. It is simply used as
a reference point from which all bridges create a network with no loops.
The root is the bridge with the lowest number for root priority. On every
segment one bridge is the "designated" bridge. This bridge will be
forwarding traffic from that segment. The designated bridge is the one with
the lowest path cost to the root. The path cost is calculated by adding the
outbound costs on all segments to reach the root. In the case where two or
more bridges have the same path cost to the root, the designated bridge is
the one with the lowest priority.
You can start drawing some diagrams with one root bridge and many other
bridges. Create some loops and start seeing which links have to be in
"blocking" mode to prevent loops (and how you can control which ones are
blocked based on path cost). It will become clear not all traffic HAS to
pass through the root bridge.
Good luck - Rob.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Rob Rummel
Sent: Tuesday, May 15, 2001 12:35 AM
To: ccielab@groupstudy.com
Subject: Dumb Bridging Question
Cant believe I'm so far along my studies but don't understand a basic
fundamental principle so please bear with me.
When a Root bridge is elected does all the traffic in that STP go THRU
the route bridge or is it just for REFRENCE for STP????
Any sufficiently advanced technology is indistinguishable from magic.
- Arthur C. Clarke
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