[PLUG] ethernet switches and glitches

Vram lamsokvr at xprt.net
Tue Dec 20 01:29:33 UTC 2005


On Mon, 2005-12-19 at 16:59 -0800, Jeff Kirsher wrote:
> On 12/19/05, Vram <lamsokvr at xprt.net> wrote:
> > On Mon, 2005-12-19 at 11:23 -0800, Jeff Kirsher wrote:
> > >
> > > It is a link managment protocol, IMHO, spanning tree is to be used for
> > > those who do not know how to setup a network.
> >
> > No... It turns out to be exactly the opposite..
> >
> > SPT is for those who know how to set up a network..
> >
> 
> How is that?  If you purposely create loops (for redundant purposes),
> then you would want to use STP as your LAST choice for a redundance
> protocol.  CDP, or EDP are two examples of protocols which respond
> faster to fail over and have more capabilities than STP.  STP (not
> SPT) was derived from the early version of Cisco's CDP.  In addition,
> there are other 802.3ad (port aggregation) which will do mutliple
> links between two network devices and can handle if one port goes
> down.

CDP

The Cisco Discovery Protocol (CDP) is a protocol for discovering devices
on a network. Each CDP-compatible device sends periodic messages to a
well-known multicast address. Devices discover each other by listening
at that address.


CDP is not to control redundant paths...

It you want traffic to go through you give it redundant paths..  Good
design..   Then you need a protocol to manage those paths..  That would
be STP...


My option and I am sticking with it...

Vram







> 
> Most of the users that I have seen who use STP, use it because they
> have an issue with plugging two network devices (i.e. switches)
> mutliple times and they do not understand why they are getting
> broadcast storms, so they enable STP and the problem goes away.
> 
> 
> --
> Cheers,
> Jeff
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