For failover, 1721 need to know by some way that the dsl link to isp went down. It is very very difficult one ethernet interface as both the interface (ethernet and dialer) will remain up/up even if the dsl link to isp went down.
There is feature request filed CSCds88143 to address that issue.
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...