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Posted by Ben on November 26, 2004, 10:16 am
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daemon wrote:
> Hi,
>
> I'm new to VLAN setup. Can anyone expert help me ?
>
> I have 2 x 2950-24 switch setup in my office, they're all under single
> 'VLAN 1'. We're using a cisco 1720 access router. I got a request from
> my boss, I need to setup a new vlan for a new dept. whcih needs to be
> isolated from existing vlan, but they need to share the internet
> access. Below is our LAN setting :
>
> Internet -- Cisco 1720 - 2 x Cisco 2950-24
>
>
> Company A LAN ip - 10.1.1.0./24
> New dept. LAN ip - 10.2.1.0/24
>
> For my understanding, 'Trunking' should able to do that. Could anyone
> teach me how to configure my switch for that ?
>
> Many thanks
There will be plenty of examples on the Cisco site for the specifics but
here's a basic rundown.
You need to daisy-chain the switch trunk ports since you don't have 2
FE's on the 1700.
So, configure "switch1" with 2 dot1q trunk ports since this will
interconnect the other switch and router.
Configure "switch2" with 1 trunking port
On the router you need to configure 2 sub-interfaces:
int fastethernet 0.1
encapsulation dot1q 1
ip address whatever
int fastethernet 0.2
encapsulation dot1q 2
ip address whatever
Hey presto there's your trunking. If you don't want the 2 vlan's to talk
to each other, that's easy. Just don't configure any routing between the
two subnets.
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