CoPP: Please explain Control Plane Transit Subinterface
The documentation doesn't explain well why some transit traffic is punted to the CPU
as Control Plane Transit Interface.
Control-plane transit subinterface. This subinterface receives all control-plane IP traffic that is software switched by the route processor. This means packets that are not directly destined to the router itself but rather traffic traversing through the router. Nonterminating tunnels handled by the router is an example of this type of control-plane traffic. Control plane protection allows specific aggregate policing of all traffic received at this subinterface.
Why isn't this merely data plane transit traffic?
Can you give an example of a "Nonterminating tunnel handled by the router". Tks