Layer -3 switching

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Dec 3rd, 2008
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In my company. We have a 4503 series switch. Tow vlan defined in this switch. Vlan and other Vlan 2 and default gateway is Default gateway is of router. and i have a one link of isp Its ip is subnet mask is and default gateway is and dns of isp is and So please suggest me I want to terminate this link in switch.

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Giuseppe Larosa Wed, 12/03/2008 - 11:40
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Hello Pradip,

just create a third vlan


vlan 3

name ISP

put one or more ports in this vlan

then if you want to use the switch to route between internal lans and ISP VLan

you need to create an SVI

interface vlan3

ip address one of ISP subnet

! no shut

no shut

notice if instead you need to use the ports as L2 switch you can do it there is no problem in this:

you can use the L3 features in some vlans and not in other ones this is left to your choice


It would be wise to hide the public addresses

I would suggest you to edit your post

mask with x.y. the first two bytes this forum can be read by everyone

Hope to help



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