You have two sites connected to an EVPN network. Each site is using the 172.16.1.0/24 network for its own respective site. How does EVPN prevent overlap in this scenario?

Question

Options

• AIt elects a designated forwarder.
• BIt uses a Layer 2 gateway.
• CIt uses a route distinguisher.
• DIt uses an Ethernet segment identifier (ESI).

• A
  15% (6)
• B
  8% (3)
• C
  72% (28)
• D
  5% (2)

Explanation

EVPN, when used with VXLAN, leverages BGP MPLS/VXLAN control plane mechanisms. To prevent overlapping IP prefixes between different tenants or sites, EVPN uses a Route Distinguisher (RD). "In EVPN-VXLAN, the route distinguisher (RD) makes routes unique when overlapping IP prefixes or MAC addresses are advertised between multiple tenants or sites." Option A (designated forwarder) applies to multi-homing in EVPN, not prefix uniqueness. Option B (Layer 2 gateway) does not prevent IP overlap; it bridges VLANs. Option D (ESI) is used for identifying multi-homed Ethernet segments, not to differentiate overlapping subnets. Option C (Route Distinguisher) is correct, as it uniquely identifies routes even if the IP addresses are the same across sites.

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