this is useful if the backup link is on a different router then the primary link. With dialer watch you can monitor the presence in the IP routing table or one or more monitored (watched prefixes) and to use this to trigger the backup DDR call.
>> can I put some ACL on EIGRP to let the routers know only the special ip can update the route, not every equipments
This is a different matter something can be done but without knowing your scenario it is difficult to say anything useful.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...