On Fri, Aug 15, 2014 at 09:22:02AM +0200, Anand Buddhdev wrote: > On 15/08/2014 00:00, Nat Morris wrote: > > > BGP sessions between the ASR 9xxxx and each DNS server in the cluster, > > ExaBGP running on them announcing their loopback/service /32 + /128 > > address(es). > > > > Health check scripts on each service to probe for service ability, > > retract the announcement upon failure. > > We are doing this exact same thing on many RIPE NCC DNS servers, and it > works very well. The other advantage of BGP is that as soon as you > withdraw the announcement, the router stops sending traffic to the > server. With OSPF, you have timeouts of several seconds before traffic > stops arriving at a dead server.
You can tweak OSPF timers like "hello" and "dead" interval in order to increase the responsiveness of the health check. Cheers, -- Marcelo Gardini _______________________________________________ dns-operations mailing list [email protected] https://lists.dns-oarc.net/mailman/listinfo/dns-operations dns-jobs mailing list https://lists.dns-oarc.net/mailman/listinfo/dns-jobs
