At 06:06 AM 8/8/01, Farhan Ahmed wrote:
>u wrote
>
> The selection of the root
> > bridge and which interfaces are blocking might not be optimized for all
>the
> > applications and devices in the large, switched network.
> >
> > With per-VLAN spanning tree, each VLAN becomes a single spanning tree
with
> > its own root bridge and own set of blocked ports. This way you can
>optimize
> > traffic flow and reduce the amount of work to converge to a spanning
tree.
>
>my question
>
>does the root bridge helps in data path flow...?
Yes, the selection of the root bridge does affect traffic flow.
>i dont think so..
>also if u can define the data flow in the network
>with and without vlan
>
>regards
>
>
>have a good day!!
>
>fa
>
>----- Original Message -----
>From: "Picciani Francesco Saverio"
>To:
>Sent: Tuesday, August 07, 2001 5:09 PM
>Subject: R: vtp, spanning tree [7:14961]
>
>
> > I thing that the main benefit of having per-VLAN spanning tree is that a
> > problem on a VLAN does not impact the other VLANs also if they lay on the
> > same ISL trunk.
> >
> > -----Messaggio originale-----
> > Da: Priscilla Oppenheimer [mailto:[EMAIL PROTECTED]]
> > Inviato: lunedl 6 agosto 2001 20.05
> > A: [EMAIL PROTECTED]
> > Oggetto: Re: vtp, spanning tree [7:14961]
> >
> >
> > At 02:13 PM 8/5/01, Cisco Troubleshooter wrote:
> > >can any body tell,
> > >
> > >why we need spanning tree protocol per vlan
> >
> > If you have a large, switched network, all the switches are in the same
> > spanning tree. Converging the spanning tree can take a long time. In
> > addition, traffic flow may not be optimized. The selection of the root
> > bridge and which interfaces are blocking might not be optimized for all
>the
> > applications and devices in the large, switched network.
> >
> > With per-VLAN spanning tree, each VLAN becomes a single spanning tree
with
> > its own root bridge and own set of blocked ports. This way you can
>optimize
> > traffic flow and reduce the amount of work to converge to a spanning
tree.
> > It's somewhat analogous to dividing a routed network into areas or
> > autonomous systems.
> >
> > Also, at least with Catalyst 1900 switches, if you allow all VLANs to
> > travel across both trunks, you will have a loop. If you don't configure
> > per-VLAN spanning tree, you will have a broken network. You would think
> > spanning tree would just work around this problem, but it doesn't seem to
> > when VLANs are configured.
> >
> >
> > >and vtp why it is needed what purpose it serves
> >
> > VTP is a management protocol that allows switches to share information
> > about VLAN names and IDs. It reduces configuration because you can
> > configure VLAN names and IDs on just one or two server switches. The rest
> > of the switches act as clients and pick up the info when they boot.
> >
> > By default, the switches do not keep track of which switches have which
> > VLANs configured, however. I disagree with the other responder who said
>VTP
> > reduces bandwidth usage on links and switches. It's VTP pruning that does
> > that.
> >
> > If you configure VTP pruning, then an added VTP message gets sent. The
> > added message includes VLAN membership information. With VTP pruning, the
> > switches become a bit smarter and do not forward traffic for a VLAN
across
> > a link or to a switch that has no ports in that VLAN. This must be
> > configured. Without pruning, VTP just shares info about VLAN names and
>IDs.
> >
> > Priscilla
> >
> >
> > >thnx in advance
> > >
> > >jd
> > >
> > >__________________________________________________
> > >Do You Yahoo!?
> > >Make international calls for as low as $.04/minute with Yahoo! Messenger
> > >http://phonecard.yahoo.com/
> > ________________________
> >
> > Priscilla Oppenheimer
> > http://www.priscilla.com
________________________
Priscilla Oppenheimer
http://www.priscilla.com
Message Posted at:
http://www.groupstudy.com/form/read.php?f=7&i=15132&t=14961
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