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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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History of MPLS in Cisco IOS

This section gives you a brief chronological overview of the MPLS implementation in Cisco IOS from its start in 1998.

Tag Switching to MPLS

Cisco Systems started off with putting labels on top of IP packets in what was then called tag switching. The first implementation was released in Cisco IOS 11.1(17)CT in 1998. A tag was the name for what is now known as a label. This implementation could assign tags to networks from the routing table and put those tags on top of the packet that was destined for that network. Tag switching built a Tag Forwarding Information Base (TFIB), which is, in essence, a table that stores input-to-output label mappings. Each tag-switching router had to match the tag on the incoming packet, ...

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