VXLAN networks suffer from ARP flooding because ARP requests are broadcasted across all VTEPs in a Layer 2 domain. To reduce ARP flooding, the following mechanisms can be enabled:
# A. Local Proxy ARP
* Allows the local VTEP to respond to ARP requests without forwarding them across the VXLAN network.
* The VTEP caches MAC-IP mappings and replies directly to ARP requests, reducing unnecessary flooding.
# B. ARP Broadcast Suppression
* Converts ARP broadcast packets into unicast or multicast packets to minimize network-wide flooding.
# C. Host Information Collection
* Collects and stores MAC-IP bindings of endpoints, which can be used by proxy ARP to reduce flooding.
# D. Port Isolation
* Port isolation prevents communication between devices within the same VLAN but does not help reduce ARP flooding between VTEPs.
Reference from Huawei HCIE-Datacom Documentation:
* Huawei VXLAN Configuration Guide - ARP Optimization Techniques
* HCIE-Datacom Training Material - Reducing ARP Broadcasts in VXLAN Networks