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EVPN-VXLAN and Network Virtualization Flashcards

7 cards from real ACSP practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. In Aruba AOS-CX EVPN-VXLAN, what is the primary purpose of a VRF (Virtual Routing and Forwarding) instance for tenant networks?

    Answer: To provide Layer 3 tenant isolation by maintaining a separate, independent routing table per tenant

    VRFs provide multi-tenant isolation by maintaining completely separate routing tables per tenant, preventing route leaks and supporting overlapping IP address spaces across tenants.

  2. How does EVPN use Type-3 (Inclusive Multicast Ethernet Tag) routes to handle BUM traffic distribution?

    Answer: Type-3 routes advertise each VTEP's address to other VTEPs for ingress replication of BUM traffic

    EVPN Type-3 routes are sent by each VTEP to advertise itself as a receiver for BUM traffic for a given VNI, enabling other VTEPs to build their ingress replication lists dynamically.

  3. What is the Ethernet Segment Identifier (ESI) used for in EVPN multi-homing scenarios?

    Answer: To uniquely identify the set of links connecting a customer edge device to multiple provider edge VTEPs

    The ESI uniquely identifies an Ethernet segment — the link or LAG between a CE and multiple PEs — enabling EVPN to coordinate multi-homing for redundancy, fast failover, and load balancing.

  4. What is a BGP Route Target (RT) in EVPN and what does it control?

    Answer: An RT is a BGP extended community that controls which VRFs import and export specific EVPN routes

    Route Targets are BGP extended communities attached to EVPN routes; VRFs are configured to export routes with specific RTs and import routes carrying matching RTs, controlling the distribution of tenant routes.

  5. How does EVPN-VXLAN achieve isolation for tenants with overlapping IP address spaces?

    Answer: By assigning each tenant a unique L2 VNI for bridging and a unique L3 VNI plus VRF for routing

    EVPN-VXLAN assigns each tenant a unique L2 VNI for Layer 2 isolation, a dedicated L3 VNI for routed traffic, and a separate VRF for routing table isolation, ensuring complete multi-tenant separation.

  6. Which Aruba AOS-CX CLI command is used to display VXLAN VTEP status and information about discovered remote tunnel peers?

    Answer: show vxlan vteps

    The 'show vxlan vteps' command on AOS-CX displays the status of remote VTEPs that have been discovered, along with their IP addresses and the VNIs they are associated with.

  7. What is the recommended underlay MTU configuration for a VXLAN deployment to prevent fragmentation of encapsulated tenant frames?

    Answer: 9000 bytes or larger (jumbo frames)

    VXLAN adds approximately 50 bytes of overhead (outer IP/UDP/VXLAN headers); jumbo frames (9000 bytes) in the underlay are strongly recommended to carry full-size tenant frames without fragmentation.