16 port network module on 3640

[csross]

I have a 3640 router that is replacing a netgear router connected to the public network (cablevision). I am getting a 16 port network module for it and want to create vlans (multiple networks) and route between the vlans and the interfaces on the router. I also need to assign addresses to pc's that request them via dhcp and use nat to allow those addresses to get to the internet.

1) I do not know how to configure the vlans so I can route between them. There is a long doc on cisco's site but it just lists all commands for the switch.

2) I was able to setup the dhcp and natting with a single network interface but I need to make sure I can do it with the switch module.

I am new at this and appreciate any help.
Christine

 

[nawlej]

Well, first of all, you arent going to have to configure DHCP or NAT on the switch module, just the VLANS. Remember, your switch module will operate at OSI layer 2, which looks at the MAC address on the machines (err, within the VLAN of course). As long as you have the DHCP configured, and the VLANS can get to that single interface, you shouldnt have to configure any further. This goes the same for NAT. You only want to configure NAT to be used on the interface connected to the internet, with NAT outside, no NAT inside. In order to make the VLANS route in between each other, one of your fast ethernet interfaces on your router needs to be a designated trunking port (The router on a stick concept), as far as I know, they cant route between them, unless there is also a designated vtp port set up on the switch as well. The basic command you are going to need when you set up your vlans in config t is "switchport trunk allowed vlan all" on your management port of the module to allow the management port and the router to send traffic to the different vlans.