I teach CCNP troubleshooting and one thing that is not talked about is that people will very often focus on a single feature or configuration because that is where they expect the problem to be when it is in fact not. Examples are, the last change that was made, the cause of the last problem that looked like the one before you. The issue is that you do not look at simpler causes. For example students will focus on what feature the lab was about, spend an hour on debugs and stuff and the issue was a SVI was no shut. Another example was I bought up a new VPN router with HSRP and focused in the crypto when in fact an ACL on the public interface blocked HSRP packets and it split brained.
The point is, if you can have someone just check the basic stuff like pings, and CDP, routing and packet drops on the interfaces even if your change was to BGP.
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