From the course: MPLS L3VPN Foundation and Implementation

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MPLS packet flow and label switching

MPLS packet flow and label switching

- [Instructor] Welcome back to the MPLS fundamental section of the MPLS Layer 3 VPN Foundation and Implementation course. This is the third video, "MPLS Packet Flow and Label Switching." By the end, you will be able to trace a packet's journey through an MPLS network and see how labels make it happen. Let's follow the pot. In an MPLS network, a packet's journey is all about labels. Let's trace it a step by step. Imagine a packet, say an IP packet, arriving at the network's edge. This is where it starts, and its trip through MPLS is a smooth label-driving right from entry to exit. Step one, the packet enters at an edge router. Here a label is pushed onto it. Think of it like attaching a shipping tag. This label isn't random. It's tied to a specific part the packet will follow. The edge router looks at the packet's destination, assigns the right label, and sends it into the network. This "push" marks the packet as MPLS ready. Step two, the packet hits a core router. Now label switching…

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