AFAIK there are 2 ways one is considering the isdn connectvitiy as a seperate point to point link and assigining a seperate /30 block for that connectivity or else you can also use ip unnunmbered option and make use of your ethernet ip or the loopback ip.
But i would suggest to go with the first option coz of the simplicity involved, also the second option may create or result in some operational problems if you have some routing protocol in place between your locations.
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...