Which of the following statements about a distributed Layer 2 EVPN is FALSE?
A.
When a host connected to a Layer 2 EVPN responds to an ARP request, it sends an ARP reply to the local leaf.
B.
The local leaf replicates the ARP reply and sends it to all the leafs in the flooding list for that Layer 2 EVPN.
C.
The local leaf learns the source MAC address from the Ethernet frame and populates it into its MAC forwarding table.
D.
The local leaf generates an EVPN route type 2 and sends it to all of its configured BGP EVPN neighbors.
The Answer Is:
B
This question includes an explanation.
Explanation:
Comprehensive and Detailed 150 to 250 words of Explanation From [SR Linux EVPN and Data Center Interconnect/Course Guide/topics]:
In a distributed Layer 2 EVPN service, the local leaf learns host reachability from frames received on access interfaces. When a host replies to an ARP request, the local leaf can learn the source MAC address from the Ethernet frame and install it in the MAC forwarding table. If the ARP payload contains an IP/MAC binding, the PE can also use that information for proxy ARP and EVPN MAC/IP advertisement. The local PE then advertises the learned endpoint reachability using EVPN route type 2 to its BGP EVPN peers or route reflector. The false statement is B. The ARP reply is not replicated to every leaf in the flooding list as a normal operation. EVPN's purpose is to reduce unnecessary flooding by distributing endpoint reachability through the control plane. BUM replication is used for broadcast, unknown unicast, and multicast traffic when needed, but a learned ARP reply does not require blind replication to all remote leaves. Instead, the leaf advertises the learned MAC/IP state through MP-BGP EVPN, allowing remote PEs to install accurate forwarding and proxy ARP state. Reference: distributed L2 EVPN operation, ARP learning, EVPN RT-2 advertisement.
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