With this behavior enabled, the edge servers can use an expired origin DNS record (an A record associating a hostname with an IP address) when forwarding a request to your origin.

How it works

Your origin’s DNS record is refreshed after serving the end-user’s request, so the end-user doesn't have to wait for the DNS resolution. Don't use this behavior if you don’t want a DNS record to be reused after it expires. For example, if you take down a server immediately after the DNS record associated with it expires, this behavior instructs the ​Akamai​ edge server to forward requests made to the server you took offline. This results in a denial of service to your end-user.

Features and options