|  | 
                
                    
                         
                             |  Constants | 
                          
                         
                             |  unspecified   | 
                             0 | 
                             Unspecified | 
                             
                                  Unspecified 
                              | 
                          
                         
                             |  passive   | 
                             1 | 
                             Passive participation | 
                             
                                  Passive, the interface doesn't participate in OSPF
                                                      protocol and will not establish adjacencies or send
                                                      routing updates. However the interface is announced
                                                      as part of the routing network 
                              | 
                          
                         
                             |  mtu-ignore   | 
                             2 | 
                             MTU ignore | 
                             
                                  MTU ignore, disables MTU mismatch detection on an
                                                      interface. 
                              | 
                          
                         
                             |  advert-subnet   | 
                             4 | 
                             Advertise subnet | 
                             
                                  Advertise ip subnet instead of a host mask in the
                                                      router LSA 
                              | 
                          
                         
                             |  bfd   | 
                             8 | 
                             BFD | 
                             
                                  Bidirectional Forwarding Detection 
                              | 
                          
                         
                             | DEFAULT  | 
                             unspecified(0) | 
                             Unspecified | 
                             
                                  Unspecified 
                              | 
                          
                    
                 
                 |