I'm not sure I got the meaning of the question (Anycast, either IPv4 or IPv6, is just a specific way to use common routing protocols and principles)... But here is a working OSPF announcing a service VIP (/32 on dummy0) on Linux, used to host an anycast DNS server (local subnet is 1.1.1.192/28 [201 and 202 are "standard" IOS switches running ...

Any DNS service with global availability such as Google, Umbrella, CloudFlare, and so on, leverage anycast for their service. Even the DNS root servers do so. Anycast simply means that you are advertising the same prefix from multiple locations. You should then in theory be routed to the closest datacenter following the best BGP route.

Vpc(s), anycast pim RPs and VNIs all look fine (I believe) and I can even get the nve for vxlan in up state. However I cannot pass any traffic in between the 4x servers connected at the edge. I have seen this before as well where Virl allows you to configure various setup but as the functionality was not supported traffic would not flow across.

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So be the case as you mentioned, but to account for it always, even when not a Anycast setup, what happens to running into SIA. Isn't that when you start dropping adjacencies and traffic. Because for sure the route goes active, as seen below …

The anycast gateway is active on each edge device/VTEP across the network fabric, eliminating the requirement to have traditional hello protocols/packets across the network fabric. Consequently, the same gateway for a subnet can be used concurrently at multiple leafs, as needed, without the requirement for any FHRP-like protocols.

point inter-router links. Routers MUST disable Subnet-Router anycast. for the prefix when /127 prefixes are used. When assigning and using any /127 prefixes, the following. considerations apply. Some addresses have special meanings, in. particular addresses corresponding to reserved anycast addresses.

But the other really cool thing that VXLAN offers above and beyond a fabric like FabricPath is a distributed anycast gateway. That is, everyleaf in a VXLAN leaf/spine topology can offer a default gateway to its attached hosts, and each leaf uses the same IP and MAC address.

Now we will setup our end host to get an IP address from DHCP. I enable IPv6 and choose the dhcp option. PC14(config)#int eth 0/0. PC14(config-if)#ipv6 enabl. PC14(config-if)#ipv6 add dhcp. But as per the log and debugs on, no address is assign: *Jul 31 19:25:43.203: IPv6 DHCP: Sending SOLICIT to FF02::1:2 on Ethernet0/0

– An anycast address must not be used as source address of an IPv6 packet. – it may be assigned to an IPv6 router only, not to IPv6 host(pc, servers etc.) So, Hopefully routing protocols might be handling anycast addresses as unicast addresses and therefore loadbalancing happaning using routing protocols default setting.