Configuring Anycast per VRF with ISC Bind & BGP

[Zayd Anas]

Hello Everyone,

I hope you're all doing well.

Is it possible to configure DNS anycast for each VRF? This would mean that every VRF has its own DNS servers for high availability configured in anycast. The DNS server is a VM running ISC BIND, and BGP would likely need to be configured on the DNS Linux VM instances.

Thank you in advance!

[Torbjørn]

Are you looking to have separate DNS servers per VRF, or have the same DNS servers shared between all VRFs? Both are possible and likely won't require running BGP on the DNS servers.

[Zayd Anas]

Thanks @Torbjørn  for your reply. I'm looking for high availability of the DNS service, binding the DNS servers to each VRF to ensure query resolution per VRF and that queries remain within their designated VRF.

[Torbjørn]

You can do this by putting the anycast subnet containing each of the DNS servers in their respective VRFs and advertise this subnet to the rest of the routing domain. If you configure a secondary IP on the gateway interface and on the DNS server you can use this address for DNS server administration.

[Zayd Anas]

Hello @Torbjørn , hope you are doing well, just checking what about sharing different VRFs in the same DNS server?
Thank you in advance.