I managed to recreate the lab in GNS3 with the exact same EVPN 1-to-1 configuration as I had on the physical setup, and it seems the same bug appears. As shown in the screenshot, one router keeps sending ARP requests while the other keeps receiving ARP replies in a loop.

I came across the issue described here and noticed that it has been marked as resolved. However, I'm still experiencing a similar problem in my environment.

I was able to fix by adding the following code in /config/scripts/vyos-postconfig-bootup.script you can edit and save by running:

I can confirm that the issue is still here, something is wrong and usually when you assign ipv6 address to sub-interface like vlan or bridge etc.

I think the issue is realated to this: https://blog.ipspace.net/2014/09/ipv6-neighbor-discovery-nd-and.html

I add here what I just found and I can reproduce the issue everytime.

You can test with 3-5 servers, the config is basic for each server:

Same issue on VyOS 1.4-rolling-202208240217

Yes on this version it is available the requested options for ipv6:

I just check and on version: vyos-1.4-rolling-202205310217 is still missing :(

FRRouting Release 8.2.2 was relased, when we will see this implemented?

Still the same on vyos-1.4-rolling-202201020317-amd64.iso

I have tested with vyos-1.4-rolling-202111281249 and is still missing, I can confirm that the frr version is 8.1.

In T3976#112210, @Viacheslav wrote:

Already implemented in FRR 8.x, so for first, we should migrate to FRR 8.x if it is possible T3753