question on Vlan

[correa]

I have a switch 3550 and i made 4 Vlan (VLAN1,VLAN2,VLAN3,VLAN4).I require that Vlan1and VLAN2 communicate between them , and that VLAN3 and VLAN2 communicate between them but Vlan 2 and Vlan3 can' communicate. I don't remember how to do this

THANKS

[lgijssel]

To enable communication between VLANs you need a router, or Layer3 functionality. Do have a 3550 with L3 image?

If not, you will need an upgrade or an external router.

Once your routing functionality is operative, you can start to filter traffic, hence only passing packets that are allowed .

To filter traffic between vlans, you need to apply access-lists to the routing-interfaces.

[correa]

Yes I have a layer 3 functionality, so what i have to do for enable and disable traffic between Vlan.

THANKS