NAT on a 4510R+E

[Marcus Peck]

Hi, I notice that NAT is not possible Cisco Catalyst 4500e series. Is there any other ways to configure NAT? Currently we have 2x Catalyst 6509 and we're migrating to the 4510e and there's NAT in the 6509s. I was thinking of re-using the 6509s and connect to the 2 new 4510e in a meshed trunking layout with MST (Layer 2) and OSPF/EIGRP (Layer 3) protocols turned on. Any suggestions? Thank you!

[Reza Sharifi · Accepted solution]

Hi,

You are correct.  The 4500 series doesn't support NAT.  You can connect the 6500 to the 4500 using L3 routed interface, with OSPF or EIGRP.  This way you don't have to worry about spanning tree and any loop issues.  If the 6500s are too expensive to maintain and you have the budget, you can get a couple a 3945 routers instead and use them to do NAT. I don't know what model 6500 you have, but the 3945 is only 3 Rack Unit

HTH