SOA records

[Andy Townhill]

Hi All,

If I have a primary name server that has had the serial number in the SOA
record changed to 2002012301 after an A record
has been modified, can anyone give a reason(s) why a tertiary name server
will still show an old SOA serial number (in fact
a very old number). The DNS records therefore made in the primary are not
being reflected in the tertiary, which is a bit of
a pain - so any ideas would be appreciated.

Cheers,
Andy.