ACSP EVPN-VXLAN and Network Virtualization 3

Question 1

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

Accepted Answer

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

Answer

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

Question 2

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

Accepted Answer

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

Answer

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.

Question 3

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

Accepted Answer

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

Answer

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.

Question 4

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

Accepted Answer

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

Answer

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.

Question 5

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

Accepted Answer

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

Answer

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.

(ACSP) Aruba Certified Switching Professional Practice Test

(ACSP) Aruba Certified Switching Professional Practice Test

ACSP EVPN-VXLAN and Network Virtualization 3