# ARP with Anycast Gateways in EVPN Asymmetric IRB

DevFeed: [ARP with Anycast Gateways in EVPN Asymmetric IRB](<https://devfeed.tech/articles/arp-with-anycast-gateways-in-evpn-asymmetric-irb-11396.md>)

Original publisher: [Read original article](<https://blog.ipspace.net/2026/06/arp-issues-evpn-anycast-unicast/>)

Published: 2026-06-17T06:19:00Z

Content type: article

Language: en

Sources: [ipSpace.net blog](<https://devfeed.tech/sources/ipspace-net-blog.md>)

Topics: [evpn](<https://devfeed.tech/topics/evpn.md>), [networking](<https://devfeed.tech/topics/networking.md>), [Routing (disambiguation)](<https://devfeed.tech/topics/routing.md>), [Protocol (disambiguation)](<https://devfeed.tech/topics/protocol.md>), [VXLAN](<https://devfeed.tech/topics/vxlan.md>)

Tags: [arp](<https://devfeed.tech/tags/arp.md>), [evpn](<https://devfeed.tech/tags/evpn.md>), [routing](<https://devfeed.tech/tags/routing.md>), [vxlan](<https://devfeed.tech/tags/vxlan.md>)

## AI overview

This article examines ARP behavior with anycast gateways in EVPN asymmetric IRB. It focuses on a topology where each PE has device-specific and shared MAC/IP addresses, and hosts use the shared anycast gateway. The article describes ARP requests, shared gateway MAC addresses, and gratuitous ARPs, including observations about Arista EOS.

## Source excerpt

In previous blog posts, I described the ARP issues in EVPN environments, starting with centralized routing, and then asymmetric IRB with unicast (per-leaf-switch) first-hop gateways. Of course, no self-respecting vendor would tell you to do that; anycast gateways are all the rage these days. As always, anycast gateways could mean different things, depending on which vendor documentation you read ;) Active-active VRRP (one device is the active VRRP gateway, but all devices listen to the VRRP MAC address). Shared MAC+IP address beside device-specific unicast MAC and IP addresses. Shared MAC+IP address with no PE-specific IP address. Read more ...