CE-based vs. PE-based VPN


  1. Strengths
    1. Overlay Model
    2. Do not depend on SP for Layer 3, or transparent to the SP
    3. Work on all SP layer 2 services
    4. span multiple SP as long as there is CE to CE IP connectivity
  2. Weaknesses
    1. Not scalable, required fully meshed, over a suboptimum hub-and-spoke topology
    2. Each new site requires new config on all sites
    3. Tunnel Header Overhead
    4. QoS consistency is harder to archive because packet is encap with additional header



  1. Strengths
  2. Weaknesses

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