In the case of the first error message, it appears that you may be using the routers own local loopback IP address in a BGP neighbor statement, resulting in the condition that a router will net set up a BGP neighbor with itself. When using loopbacks as the router ID in BGP, it is important that an IGP can find those loopbacks, or in some cases, use static routes to ensure that the router can get to the neighbors loopback IP.
From the error message it appears your neighbor statement is pointing to the router's own loopback IP address itself instead of the nieghbor's IP address. Can you make sure the neighbor command is pointing is to the peer's loopback IP address. Also, since you are configuring neighbor relationship with a loopback you need to configure ebg-miltihop, syntax is "neighbor ebgp-multihop".
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...