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Flushing Netflow DNS Info

l changed my DNS names 2 days back and l can see Netflow hasn't updated it's DNS info.l am currently using persistent DNS under DNS configuration.What should l do to make the Netflow request for new DNS info ?. Also l am still using Netflow 3.11, what does it take for me to upgrade to 4.0. Will l lose my Netflow data ?