How to propagate faster subdomains with proxies

[tsar.peter at gmail.com]

Creating a subdomain involves more then an A-record.
You need to delegate via one or several 'NS' records , create a
zonefile for the subdomain, and finally load this zonefile on the
affected nameserver(s), typically through a "zone" statement in
named.conf.

Properly done it should be visible at once ( unless the parent zone
is cached at the nameserver the resolver ( att the clients side) uses.
Recucing the effect of caching might be done by shortening the TTL
for the parent zone before the subdomain is created.