Which protocol is used in an MPLS network by PE and P routers to advertise labels?
- LDP
- CDP
- LLDP
- ARP
Explanation: When packets arrive at the MPLS ingress edge, the PE routers use Label Distribution Protocol (LDP) to add a label to the packets and forward them to the intermediate LSR, P routers. The P routers forward the packets through the MPLS network to the egress PE routers.
Exam with this question: Chapter 18: Quiz - VRF, MPLS, and MPLS Layer 3 VPNs CCNPv8 ENARSI
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