CCIE RS – Describe WAN Rate-based Ethernet Circuits – Metro and WAN Ethernet Topologies

VPLS

  • Enables carriers to bring various WAN connections (IP or MPLS) together in a single logical ethernet network
  • Allows MPLS networks to provide multipoint ethernet services
  • Allow CE nodes to communicate directly with other CE nodes
  • Ethernet Bridges – Pseudo-Wires (PW)
  • Forwards frames at L2
  • Self-learn source MAC address to port and frames are forwarded based on destination MAC address
    • If MAC is unknown, broadcast or multicast is flooded out all ports associated with virtual bridge
  • Architecture must perform
    • Auto discover other PE’s associated with the VPLS instance
    • Signaling of PWs to interconnect VPLS virtual Switch Instance (VSI)
    • Loop avoidance
    • MAC address withdrawal

Metro-Ethernet

  • • Separated into different subsections
    • Port-based
    • Per-vlan
    • Per-class per-vlan

Point-to-point

Simple:

Ethernet private line (EPL) (for example, Ethernet mapped to SONET/SDH frames) or Ethernet Internet access with IPsec encryption (no split tunnel)

Trunked:

Ethernet Virtual Private Line (EVPL), also called Ethernet Relay Service (ERS)

 

Multipoint

Simple:

Ethernet Internet access with multipoint DMVPN or MPLS Ethernet access to group encrypted transport (GET)

Trunked:

Ethernet Relay Multipoint Service (ERMS) or Ethernet Multipoint Service (EMS)

 

 

Carrier Ethernet Services

  • Ethernet Virtual Private Line – E-LINE

    • Connect 2 customer ethernet ports over a WAN
    • Ethernet Private Line (EPL)
      • Provide p2p ethernet virtual connection (EVC) between a pair of user network interfaces (UNIs)
      • High degree of transparency
    • ○ Ethernet Virtual Private Line (EVPL)
      • Provide p2p or p2m between a pair of UNIs
  • Ethernet Virtual Private LAN – E-LAN

    • Multipoint service connecting sets of customer endpoints
    • Appearance of a bridged ethernet connecting the sites
  • Ethernet Virtual Private Tree – E-TREE

    • Multipoint service connecting one or more root to a set of leaves

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