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VLAN catalyst 2950

By elmer.rivera ·
Hi all,

im trying to configure vlan on my switch, port f0/1 is set as trunk, connected to cisco router. on my switch, port f0/2 & f0/3 belong to vlan2, and f0/4 & f0/5 on vlan3, all the others are vlan1 (default). servers on port 2 & 3 see each other, and so with port 4 & 5, however, going out to the router doesnt work. i tried pinging an outside ip but it says destination unreachable. port f0/1 (trunk) has been allowed (which i know allows all by default). the cisco router port (where the switch is connected) is configured with secondary ip addresses. primary ip for vlan2 and secondary ip for vlan3.

am i missing something? are there additional configuration on my router to be done?


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by Nico Baggus In reply to VLAN catalyst 2950

You need to set the router to accept a dot1q
trunk (assuming you use dot1q and not ISL) on
its port.
This is a feature at the MAC layer, not IP
Then You can create VLANx interfaces for you
VLAN1 and VLAN2, with eacht their own address.

kind regards,

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by mshavrov In reply to VLAN catalyst 2950

Here is the link with an example, how to configure the router to do VLANs routing.

Also there are some limitations for the router/switch. Originally 802.1q was supported only on 100 MBit interfaces. I heard some IOS releases were able to do same things with an old routers, but I'm unsure.

Good luck,


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