On 2009-10-30, at 14:16, Alfred HÎnes wrote:
NEW: | This documents proposes a new QTYPE (Query pseudo RRtype) for the| Domain Name System (DNS). IXFR-ONLY is a variant of IXFR (RFC 1995)| that allows an authoritative server to incrementally update zone| content from another (primary) server without falling back from IXFR | to AXFR in case of an SOA Serial mismatch. This way, alternate peers | can be contacted more quickly and convergence of zone content may be| achieved much faster in important, resilient operational scenarios.
Your text misses slightly here since you misrepresent the effect of an "SOA serial mismatch". The generation of an AXFR response to an inbound IXFR happens for server-specific reasons (most often, you would expect, because the specific delta requested by the IXFR client cannot be isolated by the server).
An SOA mismatch is expected for any kind of transfer; if the SOA of the zone concerned was identical on both servers then no transfer of any kind would normally be attempted at all.
Joe