[dns-operations] DNS load-balancing/failover using an ASR 9xxx (few questions)

Nat Morris nat at nuqe.net
Thu Aug 14 22:00:59 UTC 2014

On 14 August 2014 18:48, Jake Zack <jake.zack at cira.ca> wrote:
> In the ASR 9xxx series with IOS XR, the “ipsla” that it has available
> doesn’t seem to do either TCP connections or UDP DNS queries.  It seems my
> only real option is to monitor for ICMP reachability and nothing else.
> Anyone have a better solution?  I’ve considered throwing a wrapper around
> BIND doing OSPF updates and such…but it seems unideal.

BGP sessions between the ASR 9xxxx and each DNS server in the cluster,
ExaBGP running on them announcing their loopback/service /32 + /128

Health check scripts on each service to probe for service ability,
retract the announcement upon failure.


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