Thank you both.  I was not sure about the auto feature if it would connect at a slower speed or not. ... View more

Forgot to mention that routing is not the problem.  The firewalls at the DC's need to see a certain source addresses.  If we NAT to all one address they will have to change their FW rules. ... View more

The customer wants to bring a data vlan and a voice vlan in the MX and NAT each VLAN to a different public IP address since data needs to be sent to one DC and vocie to another DC.  In an ISR I can do this with ease.  I would like to avoid putting the MX in passthrough mode since I heard that with a public address and passthough mode is a security risk with out an edge firewall.  The 3rd option I guess would be to get the beta release and try to route with no NAT.  ... View more