On Wed, 26 Jul 2000, Marc Quibell wrote:
> Actaully, I did another test in the lab and the STP has nothing to do with
> hubs, so BOTH switch ports were able to plug into both hub ports, no
> problem. Now my next question is: Do I now have an aggregate bandwidth of
> 20mbs?
Actually STP is important in your example.
if you have a switch with two ports connected to a hub, say ports 1 and
5. A broadcast sent to port 5, will come back into the switch on port
1. Since switches forward broadcasts, it will go back out port 5, and
back in port 1, and this will continue infinitly if STP is not enabled.
In multilayer switching networks, you can actually have your broadcasts
magnified, and things can get REAL ugly.
Brian
>
> TIA!
>
> Marc
>
>
> >From: Brian <[EMAIL PROTECTED]>
> >To: Marc Quibell <[EMAIL PROTECTED]>
> >CC: [EMAIL PROTECTED]
> >Subject: Re: Connecting Switches, hubs..
> >Date: Wed, 26 Jul 2000 12:11:21 -0500 (CDT)
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> >From [EMAIL PROTECTED] Wed Jul 26 10:13:33 2000
> >Newsgroups: groupstudy.cisco
> >In-Reply-To: <8lmv6b$do7$[EMAIL PROTECTED]>
> >Message-ID: <[EMAIL PROTECTED]>
> >References: <8lmv6b$do7$[EMAIL PROTECTED]>
> >
> >On Wed, 26 Jul 2000, Marc Quibell wrote:
> >
> > > I have a simple question, and one which I cannot readily answer at this
> > > time. Can I safely connect TWO switch ports from a Cisco 5509 (two
> >different
> > > switch blades) to a hub to increase the hub's crossconnection bandwidth,
> > > without having a looping problem? The hub is actually a DEC multi-blade,
> > > with a swithced backplane. The hub is also connect on two different
> >blades,
> > > but the same backplane. TIA!
> > >
> > > btw, I have already done this and I figured if spanning tree found a
> >looping
> > > problem, it wouldv'e set one of the ports to a non-forwarding state..
> >
> >Correct, so long as you have STP enabled you are ok.
> >
> >Brian
> >
> >
> > >
> > >
> > > ___________________________________
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> >
> >--
> >-----------------------------------------------
> >Brian Feeny, CCNA, CCDA [EMAIL PROTECTED]
> >Network Administrator
> >ShreveNet Inc. (ASN 11881)
> >
>
> ________________________________________________________________________
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--
-----------------------------------------------
Brian Feeny, CCNA, CCDA [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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