Which two statements correctly describe MPLS penultimate-hop popping (PHP)? (Choose two.)

The correct answer is B. With PHP enabled, the router upstream from the egress router pops the MPLS label. C. In the Junos OS, PHP is enabled by default. B: In penultimate-hop popping, the final MPLS label is popped from the IP packet at the last provider router in the network before being forwarded to the PE router. The PE router receives the packet and checks the IP address, and then the packet is forwarded to its destination…

MPLS

Question

Options

AIn the Junos OS, PHP is disabled by default.
BWith PHP enabled, the router upstream from the egress router pops the MPLS label.
CIn the Junos OS, PHP is enabled by default.
DWith PHP enabled, the egress router pops the MPLS label.

How the community answered

(29 responses)

A
7% (2)
B
83% (24)
D
10% (3)

Explanation

B: In penultimate-hop popping, the final MPLS label is popped from the IP packet at the last provider router in the network before being forwarded to the PE router. The PE router receives the packet and checks the IP address, and then the packet is forwarded to its destination. C: Ultimate-hop popping is disabled by default on LSPs. Penultimate-hop popping is the default statement/ultimate-hop-popping- edit-protocols-mpls.html

Topics

#penultimate hop popping#PHP#MPLS label#egress router

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