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Configuring a virtual link ······································································································································ 75

Configuring OSPF network types ································································································································· 76

Configuration prerequisites ·································································································································· 76

Configuring the broadcast network type for an interface ················································································· 76

Configuring the NBMA network type for an interface ······················································································ 77

Configuring the P2MP network type for an interface ························································································ 77

Configuring the P2P network type for an interface ··························································································· 78

Configuring OSPF route control ··································································································································· 78

Configuring OSPF route summarization ············································································································· 79

Configuring OSPF inbound route filtering ·········································································································· 80

Configuring ABR Type-3 LSA filtering ················································································································· 80

Configuring an OSPF cost for an interface ········································································································ 80

Configuring the maximum number of OSPF routes ··························································································· 81

Configuring the maximum number of ECMP routes ·························································································· 81

Configuring OSPF preference ······························································································································ 82

Configuring OSPF route redistribution ················································································································ 82

Advertising a host route ········································································································································ 84

Tuning and optimizing OSPF networks ························································································································ 84

Configuring OSPF packet timers ·························································································································· 84

Specifying LSA transmission delay ······················································································································ 85

Specifying SPF calculation interval ······················································································································ 86

Specifying the LSA arrival interval ······················································································································· 86

Specifying the LSA generation interval ··············································································································· 86

Disabling interfaces from receiving and sending OSPF packets ······································································ 87

Configuring stub routers ······································································································································· 87

Configuring OSPF authentication ························································································································ 88

Adding the interface MTU into DD packets ········································································································ 88

Configuring the maximum number of external LSAs in LSDB ··········································································· 89

Enabling compatibility with RFC 1583 ··············································································································· 89

Logging neighbor state changes ·························································································································· 89

Configuring OSPF network management ··········································································································· 90

Enabling message logging ··································································································································· 90

Enabling the advertisement and reception of opaque LSAs ············································································· 90

Configuring OSPF to give priority to receiving and processing hello packets ··············································· 91

Configuring the LSU transmit rate ························································································································ 91

Setting the DSCP value for OSPF packets ··········································································································· 92

Enabling OSPF ISPF ·············································································································································· 92

Configuring OSPF FRR ··················································································································································· 92

Configuring OSPF Graceful Restart ······························································································································ 94

Configuring the OSPF GR Restarter ····················································································································· 94

Configuring the OSPF GR Helper ························································································································ 95

Triggering OSPF Graceful Restart························································································································ 95

Configuring BFD for OSPF ············································································································································ 96

Configuring control packet bidirectional detection ··························································································· 96

Configuring echo packet single-hop detection ··································································································· 96

Displaying and maintaining OSPF ······························································································································· 96

OSPF configuration examples ······································································································································ 98

Configuring OSPF basic functions ······················································································································· 98

Configuring OSPF route redistribution ·············································································································· 101

Configuring OSPF to advertise a summary route ····························································································· 102

Configuring an OSPF stub area························································································································· 105

Configuring an OSPF NSSA area ····················································································································· 107