Nope, you will only need the SUP3, which runs IOS and has integrated L2/3/4.
The only thing you will have to order is the version of IOS you require.
when we speak about layer 3 capabilities, we assume that the equipement is able to make NAT (Network Address Translation).
However, in cisco web site, i can't find the information saying that Cat4K with SUPIII can make NAT.
have you any idea about Cat4K & NAT?
NAT is an addiotional Feature, in terms of L3 this refers to routing and swtiching at L3 level.
This device is for customers who require the following Layer 2/3/4 switching up to 64 Gbps, 48 Mpps with advanced QoS and bandwidth management, therefore mostly in the campus environment.
As far as i am aware it does not support NAT/PAT i have looked at the command ref for 12.1(11)b and no ref to NAT at all.
OK, cat4K with SUPIII does not support NAT.
so what layer 3 switch that supports NAT, can i use?
i'm afraid cisco does not provide such switch. :(
If the Cat4006 with the l3 routing blade does not support NAT. How can I make NAT work in my network? can I just attach another router to on the private vlans and let the outside router do all of the Natting to he public address networks? I am concerned about creating routing loops between VLANS, is there a better way to do this? will the sup iii on the cat 4006 ever support NAT?
Cat4k sup3 doesn't support NAT but you can use external Internet router to support NAT. Catalyst 4000 currently doesn't have WAN interfaces and hence you may want to NAT on a Router with WAN interface to covert the private IP to public IP. Cat4k sup3 is latest generation supervisor with lot of superior features.