350-601 · Question #400
An engineer is deploying a VXLAN EVPN environment for a customer. The customers environment suffers from a large amount of flooding related to hosts attempting to resolve the MAC to IP mapping on…
The correct answer is D. IP ARP suppression. To prevent excessive ARP flooding in a VXLAN EVPN environment, IP ARP suppression should be implemented as it allows the VTEP to respond to ARP requests on behalf of the hosts, thereby reducing broadcast traffic.
Question
An engineer is deploying a VXLAN EVPN environment for a customer. The customers environment suffers from a large amount of flooding related to hosts attempting to resolve the MAC to IP mapping on the network segment. Which feature prevents this issue from happening in the future?
Options
- Aanycast rendezvous point
- Banycast gateway
- CIP ARP SYNC
- DIP ARP suppression
How the community answered
(32 responses)- A3% (1)
- B6% (2)
- C16% (5)
- D75% (24)
Why each option
To prevent excessive ARP flooding in a VXLAN EVPN environment, IP ARP suppression should be implemented as it allows the VTEP to respond to ARP requests on behalf of the hosts, thereby reducing broadcast traffic.
An anycast rendezvous point (RP) is used in IP multicast routing for building shared trees and is unrelated to reducing ARP flooding in a VXLAN EVPN environment.
An anycast gateway provides a common default gateway IP and MAC address across multiple VTEPs for local subnet hosts, which is for routing optimization and redundancy, not for ARP suppression.
IP ARP SYNC is not a standard or recognized feature for preventing ARP flooding in VXLAN EVPN, unlike ARP suppression.
IP ARP suppression is a key feature in VXLAN EVPN that minimizes ARP flooding. When enabled, the VTEP (VXLAN Tunnel End Point) intercepts ARP requests from local hosts and, if it already knows the MAC-to-IP mapping for the destination, it replies directly on behalf of the remote host, preventing the ARP request from being flooded across the VXLAN fabric.
Concept tested: VXLAN EVPN ARP suppression
Source: https://www.cisco.com/c/en/us/td/docs/dcn/nx-os/nexus9000/102x/nx-os-vxlan-evpn-configuration-guide/cisco-nexus-9000-series-nx-os-vxlan-evpn-configuration-guide-102x_chapter_01.html
Topics
Community Discussion
No community discussion yet for this question.