As I get more into my current network configs, I notice that we are using PPP over ATM with MPLS VPN in some places and PPP over ATM with Frame Relay in some places, along with a point-to-point over Frame. Can someone please tell me the major differences here? more so between the mpls vpn and the frame.
MPLS is a packet-switching technology that allws for any to any connectivity and QOS tagging, Frame on the otherhand needs multiple PVCs on each endpoint to allow any to any connectivity without going through the hub node which increases latency. This can become quite pricey when paying for pvcs to each node in network ON each node in network.
MPLS is truly a step towards pure IP networking whereby the transport gives no consideration to traffic type other than IP addressing and QOS tagging to protect sensitive traffic types.