Inter-VLAN Routing and existing network

[danielsormsby]

Good afternoon!

Maybe you fine folks can help me - Trying to add another subnet to internal network (to eventually transition to this new subnet). Going to use VLAN's for this, but don't know how to create a VLAN and have it route to the existing network for web access, etc. Any suggestions?

(I've got a Catalyst 3560E That i'd like to use to create the VLAN and do the routing between the new subnet and the old)

Thanks!

[vfrolov77]

you are cisco Star. You understand everything =). I'm interested in internal 3750 (two vlans on one switch). I didn't start 7200 yet and 3750 I process, but I'll send config. I'm trying to realise where L3 interface should be for interVLANs.

Thank,

Vlad

[Jon Marshall]

Vlad

First have you created vlan 2 at layer 2 ie.

1) run "sh vlan" on the 3750. Do you see entry for vlan 2 as well as vlan 1. If not

3750(config)# vlan 2

3750(config)# name v2

2) Next you need to create routed interfaces for the vlans. On a layer 3 switch you use SVI's (Switched Virtual Interfaces). To create an SVI for vlan 2

3750(config)# int vlan 2

3750(config-if)# ip address 10.20.25.1 255.255.255.0

3750(config-if)# no shut

3) You should already have a L3 SVI for vlan 1. If you but no ip address has been assigned -

3750(config)# int vlan 1

3750(config-if)# ip address 10.20.20.1 255.255.255.0

4) All clients connected to ports in vlan 1 should have an address from 10.20.20.x subnet and their default-gateway should be 10.20.20.1

5) All clients connected to ports in vlan 2 should have an address from 10.20.25.x subnet with default-gateway 10.20.25.1

If you get this working we can then look at your 7200 if you want to add that in later.

Jon

[vfrolov77]

Great! i will config and let you know, you are genuis.

Thanks,

Vlad