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DNS Anycast in Arista environment
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3 weeks ago
Has anyone configured Anycast on Arista with MLAG? This is our 1st Anycast deployment and will be going in our new Arista environment which uses MLAG configurations. We would be looking to use BGP vs OSPF. We also need to account for the VM potentially moving between different Hosts which are all dual connected to multiple Server Leafs. Looking for any gotchas from folks that may have done this configuration and any issues with multiple concurrent BGP peers? Woudl this be problematic? Also, is the LAN2 actually required for AnyCast? I see it mentioned in some Anycast related docs but not others. If using LAN2 do the Fowarders go away? We use Forwarders to point to out Caching Teir for external resolution.
Re: DNS Anycast in Arista environment
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2 weeks ago
I have implemented same , use eBGP
and we are using VM
it easier in arista compare to nexus switch
Re: DNS Anycast in Arista environment
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2 weeks ago
Sorry I didnt read your complete question
Has anyone configured Anycast on Arista with MLAG? yes
This is our 1st Anycast deployment and will be going in our new Arista environment which uses MLAG configurations. We would be looking to use BGP vs OSPF //----yes BGP is best Option.
I did in 160+ Virtual/Cloud/Hardware type appliance
We also need to account for the VM potentially moving between different Hosts which are all dual connected to multiple Server Leafs. Looking for any gotchas from folks that may have done this configuration and any issues with multiple concurrent BGP peers? //----yes this is much easier
make sure you are getting ARP in both Gateway Leaf Switch , need to create L3 VLAN in both Gateway Leaf Switch ,keep all ports channel, VM VLAN and MLAG Peer VLAN in default vrf and enable routing under state
Woudl this be problematic? No
Also, is the LAN2 actually required for AnyCast? I see it mentioned in some Anycast related docs but not others. If using LAN2 do the Fowarders go away? We use Forwarders to point to out Caching Teir for external resolution. ///LAN 2 interface is useless just like letter "p" in "psychology" , continue with LAN1 and IPMI for LOM