Which answer about PE-CE routing is correct in a Layer 3MPLS VPN environment?

Question

Options

• AEIGRP cannot be used as a PE-CE routing protocol.
• BOSPF offers simplified route summarization when used as a PE-CE routing protocol.
• CBGP provides the most flexible PE-CE routing design.
• DOSPF provides the most flexible PE-CE routing design.

• B
  7% (1)
• C
  93% (13)

Explanation

BGP provides the most flexible PE-CE routing design in a Layer 3 MPLS VPN environment because it natively carries route policy attributes, supports the Site of Origin (SoO) extended community for loop prevention with backdoor links, scales to large numbers of prefixes and sites, and integrates cleanly with the MP-BGP control plane used between PE routers. EIGRP (A) is supported as a PE-CE protocol and can be redistributed into MP-BGP, so it is not excluded. OSPF (B) does not simplify route summarization - it actually requires additional complexity such as sham-links to handle inter-site routing correctly. OSPF (D) is less flexible than BGP in complex topologies because it has limitations around loop prevention and policy expression.

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