From: sanjay (ccienxtyear@xxxxxxxxxxx)
Date: Tue May 15 2001 - 22:07:07 GMT-3
Switching and bridging sometimes result in non optimal routing of packets
because every packet must go through the root bridge of the spanning tree.
----- Original Message -----
From: "Rob Webber" <rwebber@callisma.com>
To: "Rob Rummel" <Rummel@Hawaii.rr.com>; <ccielab@groupstudy.com>
Sent: Tuesday, May 15, 2001 6:27 AM
Subject: RE: Dumb Bridging Question
> 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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> **Please read:http://www.groupstudy.com/list/posting.html
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