reachability
Click on the red underlined text to get to the source
... use it. It is ASY's privilege to either use or disregard the
information that it receives from ASX about NET1's reachability. ASY
might decide not to use this information if it does not want to send
traffic ...
... AS will normally use one or more interior
gateway protocols (IGPs) when exchanging reachability information
within its own AS. See "IGP ...