I wanted to inquire to see if you found a solution to your configuration. I am in a similiar circumstance in configuring a 2811 with a hwic-16a interface. I haven't been able to find a specific document that speaks to the async configuration of a 2811.
We ended up with the same config and the issue was due to a wiring issue. I had to send new cables to the site since I had custom made some extensions. Check the pinouts on the cables and any extension you have in place. I had tried straight-through and crossover cables while I was onsite, but not roll-over.
Here is the key doc from TAC
Thanks for the update – It’s very critical that last leg RJ45 is a rollover RS232 cable.
I suspected this may be the problem because the notes show the CTS, RTS, DTS, and DTR different than from a up connection.
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...