I'm working on a Configuration that would place a MX100 into my network. Presently we have a Cisco 3945 that connects to the internet, (we own our own Public IP's 12 in all) and we run BGP on internet and IGRP on WAN. Our 3945 also runs CME and CUE for about 100 phones and ORG. Mail boxes. we have a WAN that has 8 branches each branch is connected to a ISR 4331 router, that runs CME for a small amount of phones at each branch. We also have a local LAN that is Vlan'ed into many parts, Staff work stations, servers, phones, etc. Where I'm having a hard time is visualizing the best placement of the MX100. whether that is replacing it as a border router or just placing in on the internal network. local LANs are on Gig 0/0, Branch WAN is on Gig 0/1, internet Gig 0/3 and a separate network for public use is on gig 0/2. The primary use for the MX100 is in the concentrator for MR and for Filtering, along with VPN functions and AD integration, We presently have 20 or so MR are throughout 9 networks.