• By default, PHP (Penultimate Hop Popping) removes the top MPLS label at the penultimate router (P-1), before the packet reaches PE-2.
• This causes loss of EXP bits from the outer label, preventing PE-2 from classifying the traffic based on them.
• Using explicit-null on PE-1 ensures the outer MPLS label is preserved, but with label value 0 (IPv4 explicit-null), so that EXP bits reach PE-2.
• PE-2 can then read the EXP bits and classify the traffic correctly
Selected Answer: A
Prefer the route with the lower origin code.
Routes learned from an IGP have a lower origin code than those learned from an exterior gateway protocol (EGP), and both have lower origin codes than incomplete routes (routes whose origin is unknown).
https://www.juniper.net/documentation/us/en/software/junos/vpn-l2/bgp/topics/concept/routing-protocols-address-representation.html
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