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]
> ~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
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