What does "Pop Label" indicate in the LFIB output?
- A new label should be pushed onto the stack
- The label should be removed and the packet dropped
- The label should be removed and the packet forwarded based on the next label or IP lookup
- The packet is destined for the local router
Explanation: In an MPLS environment, an LSR can perform three primary label operations: pop, push, or swap.
According to the sources, a pop operation, also known as label disposition, involves the removal of a label from the data packet.
Once the label is removed, the router either forwards the remaining IP packet to its destination using a standard IP lookup in the FIB, or it processes the next label in the stack if one exists.
This function is typically performed by an egress edge LSR or by a penultimate router during Penultimate Hop Popping (PHP) to enhance performance at the edge of the MPLS domain.
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