One slave tried to notify another slave after received zone change from master

[Simon Gao]

Hi,

I run into this issue while working on zone transfers from master to slave.

Here is the scenario:

n1 and ns2 are slave, ns3 is master. ns1 and ns2 are domain name servers
(NX). When changed zone files are pushed to n1 and ns2 from ns3, ns1
also tried to send the same changes to ns2.  The ns2 is configured not
to send any notification.

The bind is 9.3.2 on Linux. Why does ns1 want to notify ns2 even if it's
not a dns master for the domain?

Simon