Distribution of Tag Bindings
Each Tag Switching router (TSR) makes an independent, local decision as to which tag value is used to represent which forwarding equivalence class. This association is known as a tag binding. Each TSR informs its neighbors of the tag bindings it has made. This is done by means of the Tag Distribution Protocol (TDP).
When a tagged packet is being sent from TSR A to a neighboring TSR B, the tag value carried by the packet is the tag value that TSR B assigned to represent the packet's forwarding equivalence class. Thus the tag value changes as the packet travels through the network.
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