OSPF Notes - Authentication 2011-06-10 ·1 min readCorrections appreciated. Type 0 : No authentication. This is the default type. R0(config-if)#ip ospf authentication null ----- R0(config-router)#area 1 virtual-link 2.2.2.2 authentication null Type 1 …350-001authenticationcciedigestmd5ospftypewritten