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MPLS. What is it and why?
Article posted by Ross on Thursday, February, 5th, 2009 at 3:10 pmThe technical information about MPLS is below. Important thing to know is that it allows companies with multiply locations to more effectively and efficently manage their networks. Not only are they able to save money; but greatly increase the redundancy and reliability of their network.
Short for Multiprotocol Label Switching integrates Layer 2 information about network links (bandwidth, latency, utilization) into Layer 3 (IP) within a particular autonomous system–or ISP–in order to simplify and improve IP-packet exchange.
MPLS gives network operators a great deal of flexibility to divert and route traffic around link failures, congestion, and bottlenecks.
From a QoS standpoint, ISPs will better be able to manage different kinds of data streams based on priority and service plan. For instance, those who subscribe to a premium service plan, or those who receive a lot of streaming media or high-bandwidth content can see minimal latency and packet loss.
When packets enter a MPLS-based network, Label Edge Routers (LERs) give them a label (identifier). These labels not only contain information based on the routing table entry (i.e., destination, bandwidth, delay, and other metrics), but also refer to the IP header field (source IP address), Layer 4 socket number information, and differentiated service. Once this classification is complete and mapped, different packets are assigned to corresponding Labeled Switch Paths (LSPs), where Label Switch Routers (LSRs) place outgoing labels on the packets.
With these LSPs, network operators can divert and route traffic based on data-stream type and Internet-access customer. (Source is webopedia.com)
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