Yes and No, First of All, CDP is turned off.
if you do direct connection between some routers, there is a problem (bug). A temp solution is to add virtual service to interface config. there is a config example in see https://developer.cisco.com/docs/modeling-labs/#!faq/external-connectivity
otherwise, use a switch between routers.
some interfaces on a device are reserved for management purpose; do not use those.
Regards, ML
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