I have ISDN PRI configured as a backup line, with DDR Dialer Profiles.
I checked the Admin Distance values: Main routes are OSPF-learned (110), floating route through ISDN (200).
Despite of the preferred OSPF Routes, there one host that's still opening the Dialer interface.
If I use an ACL against that host, it would prevent it from accessing the WAN at all.
What can I do to change this up-and-down behaviour?
I attached the Dialer1 config and a Syslog output.