Click the Exhibit button.
Referring to the exhibit, a working L3VPN exists that connects VPN-A sites. CoS is configured correctly to match on the MPLS EXP bits of the LSP. but when traffic is sent from Site-1 to Site-2. PE-2 is not classifying the traffic correctly.
What should you do to solve the problem?
To solve the problem where PE-2 is not classifying the traffic correctly based on the MPLS EXP bits, you need to configure the explicit-null statement on PE-2. Configuring explicit-null on PE-2 allows the MPLS EXP bits to be preserved when the MPLS header is removed, ensuring that the CoS information is correctly interpreted by PE-2.
Explicit-null should be configured on PE-2
Ultimate Hop Popping (UHP) must be configured on the egress LSR to keep the EXP bit along the LSP. So configuration is needed on PE-2 in this case.
C is correct
The QoS is on the label and the second-to-last router on the LSP should keep the label on instead of having it arrived popped