a method of having a static route added to the neighboring router with a higher distance via the ISDN interfaces
                                                            
                                                     
                        
                                                
                        
                        
                            a route that will be used only if routes for the same destination but with a lower administrative distance are removed from the table
                                                            
                                                     
                        
                                                
                        
                        
                            a statically configured route that can be overridden by dynamically learned routing information