A VLAN is logically the same as a physical routed LAN.
Users on the same VLAN generally belong to the same IP
subnet.
VLANs are created for the following reasons:
1. Containing the propogation of broadcasts in a
switched environment.
2. Security
3. VLANs can be more flexible than traditional routed
LANs. For example, if a user needs to move from one
VLAN to another (e.g employee changing departments)
their PC can move to that VLAN by configuring the
switch port to be in the appropriate VLAN. There is no
need for re-patching.
Cormac Long CCSI#21600
http://www.cormaclong.com
--- brain at yahoo <[EMAIL PROTECTED]> wrote:
> then what is the advantage of vlan? if we need a
> router between vlans.
>
>
> Gm
>
> ----- Original Message -----
> From: Dan West <[EMAIL PROTECTED]>
> To: brain at yahoo <[EMAIL PROTECTED]>; A. Geoffrey
> Cauchi
> <[EMAIL PROTECTED]>; Luan Kim
> <[EMAIL PROTECTED]>; Sim, CT (Chee Tong)
> <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Monday, July 03, 2000 5:57 PM
> Subject: Re: how to configure VLAN on 2900
> switch-how about full duplex an d
> spanning tree
>
>
> > I don't know a whole lot about VLANs, but
> everything
> > so far has said that you need a router to
> communicate
> > between VLANs.
> >
> >
> > --- brain at yahoo <[EMAIL PROTECTED]> wrote:
> > > But after configuring second VLAN, my different
> > > can't talk to each other.
> > > what colud be the problem and how i can solve
> that.
> > >
> > > My net address are 192.168.1.x, 192.168.2.x,
> > > 192.168.3.x, 192.168.4.x and
> > > mail Enterprise sw is on 192.168.3.x and one
> switch
> > > for all other net.
> > >
> > > Gm
> > > ----- Original Message -----
> > > From: A. Geoffrey Cauchi <[EMAIL PROTECTED]>
> > > To: Luan Kim <[EMAIL PROTECTED]>; Sim, CT (Chee
> > > Tong)
> > > <[EMAIL PROTECTED]>
> > > Cc: <[EMAIL PROTECTED]>
> > > Sent: Monday, July 03, 2000 4:51 PM
> > > Subject: Re: how to configure VLAN on 2900
> > > switch-how about full duplex an d
> > > spanning tree
> > >
> > >
> > > > Hi
> > > >
> > > > First you have to define VLAN 2.
> > > >
> > > >
> > > > In the enable mode, (not the config mode!),
> type
> > > the following
> > > >
> > > > Vlan database
> > > > Vlan vlan2
> > > > Vtp server
> > > > Vtp domain domain_name
> > > > Apply
> > > > Exit
> > > >
> > > > Then continue as specified below
> > > >
> > > > Regards
> > > > Geoffrey
> > > >
> > > > ----- Original Message -----
> > > > From: "Luan Kim" <[EMAIL PROTECTED]>
> > > > To: "Sim, CT (Chee Tong)"
> > > <[EMAIL PROTECTED]>
> > > > Cc: <[EMAIL PROTECTED]>
> > > > Sent: Monday, July 03, 2000 12:48 PM
> > > > Subject: RE: how to configure VLAN on 2900
> > > switch-how about full duplex an
> > > d
> > > > spanning tree
> > > >
> > > >
> > > > > Hi Chee Tong,
> > > > > With your current "show run" below, you're
> only
> > > running one vlan1 on
> > > your
> > > > > catalyst 2924. By default, the catalyst
> 2924
> > > comes with one VLAN1. By
> > > > > adding another VLAN2 in your switch, you can
> > > reduce broadcasts on your
> > > > > network. Here is an example of placing port
> > > fastethernet0/6 on VLAN2:
> > > > >
> > > > > conf t
> > > > > int fastethernet0/2
> > > > > switchport access vlan 2
> > > > >
> > > > >
> > > > > And if you want to enable spanning-tree,
> first
> > > do this to see if it's
> > > > > already enabled on the switch:
> > > > >
> > > > > sh span
> > > > >
> > > > > If it shows that it's "disabled", then you
> can
> > > do this to enable it:
> > > > >
> > > > > conf t
> > > > > spanning
> > > > >
> > > > > Hope it'll help you.
> > > > >
> > > > > ********************************************
> > > > > Luan T. Kim, MCSE, CCNA *
> > > > > Systems/Network Infrastructure Engineer *
> > > > > MP3.COM, INC. http://www.mp3.com *
> > > > > Phone: 858-623-7341 Cell: 858-382-3055 *
> > > > > Fax: 858-623-7400 Email: [EMAIL PROTECTED] *
> > > > > ********************************************
> > > > >
> > > > >
> > > > > On Mon, 3 Jul 2000, Sim, CT (Chee Tong)
> wrote:
> > > > >
> > > > > >
> > > > > > Hi.. Kim! Thank for your info, but I am
> going
> > > to ask you futher , what
> > > > is
> > > > > > the difference between VLAN1 and VLAN2,
> pls
> > > take a look on the
> > > > following
> > > > > > configuration file, the VLAN1 (below) it
> is
> > > for every fastethernet
> > > > > > interface? what is the syntax to configure
> > > spanning tree and full
> > > duplex
> > > > on
> > > > > > the interface.
> > > > > >
> > > > > > Thank you in advance :)
> > > > > > Tong
> > > > > >
> > > > > >
> > > > > >
> > > > > > User Access Verification
> > > > > >
> > > > > > Password:
> > > > > > Password:
> > > > > > simtest>en
> > > > > > Password:
> > > > > > simtest#sh conf
> > > > > > Using 1315 out of 32768 bytes
> > > > > > !
> > > > > > version 12.0
> > > > > > no service pad
> > > > > > service timestamps debug uptime
> > > > > > service timestamps log uptime
> > > > > > no service password-encryption
> > > > > > !
> > > > > > hostname simtest
> > > > > > !
> > > > > > enable secret 5
> $1$C8R4$zMASNLTu0DeKZ.gCgcomt.
> > > > > > !
> > > > > > !
> > > > > > !
> > > > > > !
> > > > > > !
> > > > > > !
> > > > > > ip subnet-zero
> > > > > > !
> > > > > > !
> > > > > > !
> > > > > > interface FastEthernet0/1
> > > > > > !
> > > > > > interface FastEthernet0/2
> > > > > > !
> > > > > > interface FastEthernet0/3
> > > > > > !
> > > > > > interface FastEthernet0/4
> > > > > > !
> > > > > > interface FastEthernet0/5
> > > > > > !
> > > > > > interface FastEthernet0/6
> > > > > > !
> > > > > > interface FastEthernet0/7
> > > > > > !
> > > > > > interface FastEthernet0/8
> > > > > > !
> > > > > > interface FastEthernet0/9
> > > > > > !
>
=== message truncated ===
=====
http://www.cormaclong.com
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