L3 Switch to Router

Answered Question
May 26th, 2008
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Hi all,

a simple question i guess..but need confirmation..we have configured vlans on my l3 switch and this is connected to a router. l3 switch is configured for ip routing.

Here are the below configurations.

For switch this is configured..

interface FastEthernet0/3

description TRANSIT VLAN

switchport access vlan 70

switchport mode access


interface Vlan70

description transit

ip address

This is fa0/3 port is connected to router with below config

interface FastEthernet1/0/3

no switchport

ip address

speed 100

duplex full

no cdp enable

my question is, Is the transit vlan really required?shouldn't it be just like a normal "no switchport" in the switch fa0/3 with ip address configured??does the current config have any advantages..

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Overall Rating: 5 (1 ratings)
Correct Answer


The only real good reason I would use a transit VLAN would be for synamic routing - but I guess you could use it for anything you want.

If your situation - it does not really enhance your network. I would turn fa0/3 into a normal switch port - and let the router talk to the l3 interface in the switch.


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