I understand what AD is, and what Cisco uses for AD values. I have read the documentation from here. At the bottom of the table is "Uknown"
"Unknown" has an astrix with the following:
"If the administrative distance is 255, the router does not believe the source of that route and does not install the route in the routing table."
My question is, when is a source considered not trusted? When would unknown be applied? Any examples out there? Follow up question, if a link goes down, what AD is applied to said interface?
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