What are the advantages of IP VPN over frame relay or ATM?
One of the features in MPLS which contributes to its speed and security is that in MPLS there is a unique label (hence cannot be spoofed unlike IP header) for every packet transmitted. This label is checked only at the service provider edge routers unlike IP header analysis happening at every hop which made an IP VPN relatively less secure and also slower. For integrated video, voice and data applications, the use of MPLS helps to guarantee differential QoS (quality of service) levels for multi-service deployments by way of packet prioritization/bandwidth reservation required by voice/video. The use of IP for video, voice and data is a key enabler for easy integration of voice/video calls into customers application thereby bringing down the overall TCO for large and complex enterprise deployments.
