Router that routes unlabeled packet using some route for which it has received label from next hop, imposes label on packet and send it to next hop - it gets MPLS switched further along its path. In the simplest form MPLS can be thought of like improved routing - labels are distributed by means of LDP protocol for routes that are active and labeled packet takes the same path it would take if it was not labeled.
traffic that is going to be dropped anyway does not travel through MPLS backbone. Any network layer based actions should be taken on ingress or egress of MPLS cloud, with preferred way being ingress - this way, e.g. IP) headers, therefore no network layer based actions like NAT and filtering can be applied to MPLS forwarded packets. Speeds up forwarding process because next hop lookup becomes very simpleĬompared to routing lookup (finding longest matching prefix).Įfficiency of forwarding process is the main benefit of MPLS, but it must be taken into account that MPLS forwarding disables processing of network layer (e.g. Routing table, but on labels that are attached to packet.
Is no longer based on fields in IP header (usually destination address) and Routing - packet forwarding decision (outgoing interface and next hop router) MPLS stands for MultiProtocol Label Switching.
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