L3 Switch to Router

[zanub]

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 10.191.28.8 255.255.255.240

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

interface FastEthernet1/0/3

no switchport

ip address 10.191.28.2 255.255.255.240

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..

[andrew.prince · Accepted solution]

Zanub,

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.