11DR and BDR ··························································································································································· 88OSPF packet formats ············································································································································· 89Supported OSPF features ····································································································································· 99Protocols and standards ····································································································································· 101OSPF configuration tasks ············································································································································ 101Enabling OSPF ····························································································································································· 102Prerequisites ························································································································································· 102Configuration procedure ···································································································································· 102Configuring OSPF areas ············································································································································· 103Prerequisites ························································································································································· 103Configuring a stub area ····································································································································· 104Configuring an NSSA area································································································································ 104Configuring a virtual link ···································································································································· 105Configuring OSPF network types ······························································································································· 106Prerequisites ························································································································································· 106Configuring the OSPF network type for an interface as broadcast ······························································· 107Configuring the OSPF network type for an interface as NBMA ···································································· 107Configuring the OSPF network type for an interface as P2MP ······································································ 108Configuring the OSPF network type for an interface as P2P ·········································································· 109Configuring OSPF route control ································································································································· 110Prerequisites ························································································································································· 110Configuring OSPF route summarization ··········································································································· 110Configuring OSPF inbound route filtering ········································································································ 112Configuring ABR Type-3 LSA filtering ··············································································································· 112Configuring an OSPF cost for an interface ······································································································ 113Configuring the maximum number of OSPF routes ························································································· 114Configuring the maximum number of load-balanced routes ·········································································· 114Configuring a priority for OSPF························································································································· 114Configuring OSPF route redistribution ·············································································································· 115Advertising a host route ······································································································································ 117Configuring OSPF network optimization ··················································································································· 117Prerequisites ························································································································································· 117Configuring OSPF packet timers························································································································ 117Specifying an LSA transmission delay ·············································································································· 118Specifying SPF calculation interval ···················································································································· 119Specifying the LSA minimum repeat arrival interval ························································································ 119Specifying the LSA generation interval ············································································································· 120Disabling interfaces from receiving or sending OSPF packets ······································································· 121Configuring stub routers ····································································································································· 121Configuring OSPF authentication ······················································································································ 122Adding the interface MTU into DD packets ······································································································ 123Configuring the maximum number of external LSAs in LSDB ········································································· 123Making external route selection rules defined in RFC 1583 compatible ······················································ 124Logging neighbor state changes························································································································ 124
