How to minimize the unwanted traffic?

Hi,

I'm going to upgrade from Bind 9.2.3 to 9.3.1 and bcause of that I'm now
testing the 9.3.1 with one primary and three secondary Server.

In the logfile of the primary I found messages like:
08-Apr-2005 09:01:32.704 client 10.100.100.100#65011: query:
66.10.in-addr.arpa IN SOA -SE
First a question for better understanding: What does the -SE at the end of
the line mean? SEcondary? (the 10.100.100.100 is one of my secondaries)

In our Intranet we have many zones (more than thousend), so I get very much
of these messages, where one of the secondaries ask if the SOA of a zone has
changed.
But because we use dynamic DNS where the secondaries are informed of every
change, these queries are in fact not needed and produced unwanted traffic.

So I thought, I could minimize this unwanted traffic if I increase the
expire-time of every zone. But it did not work. Even with a expire-time of
100 days for every zone I keep getting these SOA -SE queries from my
secondaries.

So my question is:
What can I do to minimize this traffic? After what time the secondaries make
this (not needed) query?

Thanks,
Tom.

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