l MPLS network forwards packet according to the label. But how does label be generated? What mechanism does MPLS adopt to implement data forwarding?
l MPLS includes two plane: control plane and data plane.
l Control plane’s charge is to generate and maintain routing information and label information. Data plane’s charge is conventional IP packet forwarding and labeled packet forwarding.
l In control plane, routing protocol module is used to transmit routing information, generate routing table; label distribution protocol is used to complete exchange of label and establish label switch path.
l Data plane includes IP forwarding table and label forwarding table, when receiving conventional IP packets, if it is conventional IP forwarding, it should lookup routing table and forward, if it is label forwarding, it should forward by the label forwarding table; when receiving labeled packets, if it needs to forward by label, it should forward by label forwarding table, if it needs to transmit to IP network, it should remove label and forward by IP routing table.
from the best of networkinghttp://thebestofnetworking.blogspot.com/2015/04/mpls-structure.html
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