Forwarding of Labeled Packets
This section looks at how labeled packets are forwarded in MPLS networks, how forwarding labeled packets is different from forwarding IP packets, how labeled packets are load-balanced, and what a label switching router (LSR) does with a packet with an unknown label.
Label Operation
The possible label operations are swap, push, and pop. Look at Figure 3-1 to see the possible operations on labels.
Figure 3-1. Operations on Labels
By looking at the top label of the received labeled packet and the corresponding entry in the LFIB, the LSR knows how to forward the packet. The LSR determines what label operation needs ...
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