Hi
In the first scenario, the book explains the setup without ISL being
configured, and hence each one of the 3 VLANs need a separate link to
communicate to VLAN60. Only when ISL is configured , your argument holds
good.
Hope this clears your doubt.
Regds
--- Ole Drews Jensen <[EMAIL PROTECTED]> wrote:
> A little bit Scott, but the first scenario shows it without trunking:
>
> (this should be viewed with a fixed font)
>
> [SWITCH] [ROUTER] [SWITCH]
> [vlan10]----------[ ]----------[vlan20]
> [vlan11]----------[ ]----------[ ]
> [vlan12]----------[ ]----------[ ]
>
> This I believe is wrong, since it should only need one physical
> connection
> between the router and the second switch (to the right) - like this:
>
> [SWITCH] [ROUTER] [SWITCH]
> [vlan10]----------[ ]----------[vlan20]
> [vlan11]----------[ ] [ ]
> [vlan12]----------[ ] [ ]
>
> The purpose of the router is to route from one network to another, and
> if
> you would send data from a workstation on vlan11 to a workstation on
> vlan20,
> it should go via the cable connected to the port on the first switch
> that is
> assigned to vlan11. In the router it would be routed to vlan20 which
> should
> only have one connection from that switch.
>
> If you (or anyone else) disagree, please let me know why.
>
> Thanks,
>
> Ole
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
> Ole Drews Jensen
> Systems Network Manager
> CCNA, MCSE, MCP+I
> RWR Enterprises, Inc.
> [EMAIL PROTECTED]
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
> -----Original Message-----
> From: Scott Nelson [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, September 14, 2000 6:08 PM
> To: '[EMAIL PROTECTED]'
> Subject: Re: BCMSN: Inter VLAN communication
>
>
> > I have just started reading about devices on different VLAN's
> communicating
> > with eachother via a Router.
> >
> > The thing I find odd (page 190/191 in Karen Webb's book) is the
> following:
> >
> > Three (3) VLAN's are configured on the first switch, and one (1) VLAN
> is
> > configured on the second switch.
>
> On the first switch, there are 3 VLANs that are configured to go to 3
> interfaces on the first router and on the 2nd switch, it could be using
> ISL
> or 802.1q trunking to a second router. You don't need 3 separate
> interfaces
> when you are doing trunking as long as the switch and the router can do
> ISL
> or 802.1q or whatever proprietary protocol you want to use for trunking,
> both have to speak the same trunking language.
>
> Does that clear it up a little?
>
> Scott
>
>
>
> > The first switch has three physical connections to the router, which
> makes
> > sense, but the second switch has three physical connections to the
> router
> > too, which doesn't make sense (to me at least).
> >
> > The way I see it, is that a VLAN would be (in theory) similar to a
> physical
> > LAN, so if I change the three (3) VLAN's on one switch to three
> switches
> > with one VLAN each, I would have one physical connection from each
> switch
> to
> > the router, and one physical connection from the second, or in this
> case
> the
> > fourth switch to the router.
> >
> > I know that I will probably know the answer to this if I just finish
> the
> > chapter, but I hate not being sure about the information that the rest
> of
> > the information is related to.
> >
> > Can someone clarify that for me?
> >
> > Thanks,
> >
> > Ole
> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Ole Drews Jensen
> > Systems Network Manager
> > CCNA, MCSE, MCP+I
> > RWR Enterprises, Inc.
> > [EMAIL PROTECTED]
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> >
> > **NOTE: New CCNA/CCDA List has been formed. For more information go to
> > http://www.groupstudy.com/list/Associates.html
> > _________________________________
> > UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> > FAQ, list archives, and subscription info: http://www.groupstudy.com
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
>
> ----------------------------------------------------------
> Scott Nelson - Network Engineer
> Wash DC +1202-270-8968 & +1202-352-6646
> Los Angeles +1310-367-6646
> mailto:[EMAIL PROTECTED]
> ----------------------------------------------------------
>
> "The better the customer service, the sooner you get to speak
> with someone who can't help you."
> ----------------------------------------------
>
> **NOTE: New CCNA/CCDA List has been formed. For more information go to
> http://www.groupstudy.com/list/Associates.html
> _________________________________
> UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> FAQ, list archives, and subscription info: http://www.groupstudy.com
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
> **NOTE: New CCNA/CCDA List has been formed. For more information go to
> http://www.groupstudy.com/list/Associates.html
> _________________________________
> UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
> FAQ, list archives, and subscription info: http://www.groupstudy.com
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
__________________________________________________
Do You Yahoo!?
Yahoo! Mail - Free email you can access from anywhere!
http://mail.yahoo.com/
**NOTE: New CCNA/CCDA List has been formed. For more information go to
http://www.groupstudy.com/list/Associates.html
_________________________________
UPDATED Posting Guidelines: http://www.groupstudy.com/list/guide.html
FAQ, list archives, and subscription info: http://www.groupstudy.com
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
