What does happen? I would think that nothing happens because traffic with
the wrong color coming into the switch port would be dropped. Is this what
happens?
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]
Sent: Thursday, July 27, 2000 2:51 PM
To: [EMAIL PROTECTED]
Subject: Re: Connecting Switches, hubs..
Since we seen to be doing the Spanning Tree simulations today... Imagine
what happens when you have two instances of STP running, one per VLAN on
VLAN 100 and VLAN 200, and then hook both VLAN 100 and VLAN 200 to the same
hub. :-)
Have fun! <evil grin>
Karen E Young
Network Engineer
ELF Technologies, Inc
[EMAIL PROTECTED]
Brian
<signal@shrev To: Marc Quibell
<[EMAIL PROTECTED]>
e.net> cc: [EMAIL PROTECTED]
Sent by: Subject: Re: Connecting
Switches, hubs..
nobody@groups
tudy.com
07/27/00
07:40 AM
Please
respond to
Brian
On Thu, 27 Jul 2000, Marc Quibell wrote:
> STP does not work with hubs. It only works in a completly switched
network.
> Hubs do not run STP, hence the switch does not get BDPU's from the hub
and
> does not recognize the non-STP connected ports in order to put the port
into
> to a mode such as blocking mode.
correct.
>
> That said, let's say you do have 2 switch ports (1&2) connected to a same
> hub. A broadcast occurs, which comes in on ports 1&2, but since a
switched
> port does not return traffic to the source port, the broadcasts coming in
on
> ports 1&2 will not get re-broadcasted back onto themselves...
>
but broadcasts going out port 1 will still goto port 2 (which isn't
itself), and vice versa. With no STP, this would create looping.
Brian
>
> >From: Brian <[EMAIL PROTECTED]>
> >To: Marc Quibell <[EMAIL PROTECTED]>
> >CC: [EMAIL PROTECTED]
> >Subject: Re: Connecting Switches, hubs..
> >Date: Wed, 26 Jul 2000 20:16:32 -0500 (CDT)
> >MIME-Version: 1.0
> >Received: from [208.206.76.23] by hotmail.com (3.2) with ESMTP id
> >MHotMailBB48D86F008DD820F3DAD0CE4C17101E0; Wed Jul 26 18:16:32 2000
> >Received: from mercury.shreve.net (IDENT:[EMAIL PROTECTED]
> >[208.206.76.23])by mercury.shreve.net (8.9.3/8.9.3) with ESMTP id
> >UAA13766;Wed, 26 Jul 2000 20:16:32 -0500
> >From [EMAIL PROTECTED] Wed Jul 26 18:21:17 2000
> >In-Reply-To: <[EMAIL PROTECTED]>
> >Message-ID:
<[EMAIL PROTECTED]>
> >
> >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)
> > > >MIME-Version: 1.0
> > > >Received: from [208.206.76.23] by hotmail.com (3.2) with ESMTP id
> > > >MHotMailBB4866B7003DD82197E9D0CE4C1712E90; Wed Jul 26 10:11:20 2000
> > > >Received: from mercury.shreve.net (IDENT:[EMAIL PROTECTED]
> > > >[208.206.76.23])by mercury.shreve.net (8.9.3/8.9.3) with ESMTP id
> > > >MAA04159;Wed, 26 Jul 2000 12:11:22 -0500
> > > >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
> > > >
> > > >
> > > > >
> > > > >
> > > > > ___________________________________
> > > > > UPDATED Posting Guidelines:
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http://www.groupstudy.com
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> > > > >
> > > >
> > > >--
> > > >-----------------------------------------------
> > > >Brian Feeny, CCNA, CCDA [EMAIL PROTECTED]
> > > >Network Administrator
> > > >ShreveNet Inc. (ASN 11881)
> > > >
> > >
> > >
________________________________________________________________________
> > > Get Your Private, Free E-mail from MSN Hotmail at
http://www.hotmail.com
> > >
> >
> >--
> >-----------------------------------------------
> >Brian Feeny, CCNA, CCDA [EMAIL PROTECTED]
> >Network Administrator
> >ShreveNet Inc. (ASN 11881)
> >
>
> ________________________________________________________________________
> Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com
>
-----------------------------------------------
Brian Feeny, CCNA, CCDA [EMAIL PROTECTED]
Network Administrator
ShreveNet Inc. (ASN 11881)
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