Hmmm - everything seems to be okay here. Are you suggesting that the pings are not answered?
Can you please turn on the debug ip packet detail and debug ip icmp on a router and then try pinging some other router in your FR network? Have these two debugs running on both the sender and recipient of the ping so that we can see if the ping is being successfully sent and whether it is received correctly.
Also, are you running these experiments on real hardware or are you using any simulator for these? The Serial1/0 interface suggests that dynamips or similar tool is being used. If this is the case, I suggest double-checking its configuration and removing all stale temporary files - they may be causing the problem.
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...