Inter VLAN Routing

[Mark Bowyer]

I am pretty sure this is the case, but for inter vlan routing the work properly, does there need

to be an IP address set on the VLAN interface? I am fairly sure there does need to be

as it would not know where to route the traffic to otherwise as I dont think the traffic is tagged until it reaches the trunk.

[Nagaraja Thanthry · Accepted solution]

Hello,

You are correct. You need an IP on the VLAN SVI (virtual interface) to acheive InterVLAN routing (if you are using a Layer 3 switch). If you are using a Layer 2 switch, then you need a router to do InterVLAN routing.

interface VLAN 1

ip address

exit

interface VLAN 2

ip address

exit

ip routing

Please make sure that all devices in the VLAN point to these two addresses as their default gateway respectively.

Hope this helps.

Regards,

NT

[Mark Bowyer]

I just read over your post again. It is actually a 3750 that I am talking about which is a layer

3 switch. So you are saying that I would need to assign an IP address on every vlan that I need to route somewhere? On a router you would need to create sub interfaces and tag each sub interface?

[Nagaraja Thanthry]

Hello,

Yes, that is correct. That IP address will act as default gateway for all

the hosts in the VLAN.

Regards,

NT