4A0-115: Nokia Ethernet Virtual Private Network ServicesDemo

By Nokia · Question Mode

QuestionQ12

EVPN for ELAN services

Refer to the exhibit. Which of the following statements regarding the operation of VPLS 20 is TRUE?

Question Image

  • A The flooding list maintained by PE1 for VPLS 20 contains three entries: PE2, PE3, and PE4.
  • B PE3 advertises an IMET route to PE1 when its VPLS 20's mesh-SDP becomes operationally UP.
  • C PE3 signals a service label to PE4 when its VPLS 20 is enabled and is bound to an operational SDP.
  • D PE1 advertises a MAC route for MAC-01 when its VPLS 20's SAP becomes operationally UP.
Explanation

In the non-EVPN portion of the topology, PE3 and PE4 are interconnected via a classic mesh-SDP for VPLS 20. In this traditional VPLS signaling model, once the SDP is operationally up and the VPLS service is enabled and bound to that SDP, the PE uses targeted LDP (T-LDP) to signal a VC/service label to its peer for that service, enabling MPLS-encapsulated Ethernet frames to be exchanged over the SDP. This is independent of the EVPN-VXLAN control plane used on the PE1-PE3 and PE4-PE2 segments, where MAC/IMET route advertisement is instead driven by EVPN-specific triggers (MAC learning and VXLAN binding state), not by the mesh-SDP's operational status or SAP state alone.

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