iii
Configuring OSPF route control ··································································································································· 81
Configuration prerequisites ·································································································································· 81
Configuring OSPF route summarization ············································································································· 81
Configuring OSPF inbound route filtering ·········································································································· 82
Configuring ABR Type-3 LSA filtering ················································································································· 83
Configuring an OSPF cost for an interface ········································································································ 83
Configuring the maximum number of ECMP routes ·························································································· 84
Configuring OSPF preference ······························································································································ 84
Configuring OSPF route redistribution ················································································································ 84
Advertising a host route ········································································································································ 86
Tuning and optimizing OSPF networks ························································································································ 86
Configuration prerequisites ·································································································································· 86
Configuring OSPF packet timers ·························································································································· 87
Specifying an LSA transmission delay ················································································································ 87
Specifying SPF calculation interval ······················································································································ 88
Specifying the LSA arrival interval ······················································································································· 88
Specifying the LSA generation interval ··············································································································· 89
Disabling interfaces from receiving and sending OSPF packets ······································································ 89
Configuring stub routers ······································································································································· 89
Configuring OSPF authentication ························································································································ 90
Adding the interface MTU into DD packets ········································································································ 91
Configuring the maximum number of external LSAs in LSDB ··········································································· 92
Enabling compatibility with RFC 1583 ··············································································································· 92
Logging neighbor state changes ·························································································································· 92
Configuring OSPF network management ··········································································································· 93
Enabling message logging ··································································································································· 93
Enabling the advertisement and reception of opaque LSAs ············································································· 94
Configuring OSPF to give priority to receiving and processing hello packets ··············································· 94
Configuring the LSU transmit rate ························································································································ 94
Enabling OSPF ISPF ·············································································································································· 95
Configuring OSPF FRR ··················································································································································· 95
Configuring OSPF Graceful Restart ······························································································································ 96
Configuring the OSPF GR restarter ····················································································································· 97
Configuring the OSPF GR helper ························································································································ 97
Triggering OSPF Graceful Restart························································································································ 98
Configuring OSPF NSR ················································································································································· 98
Configuring BFD for OSPF ············································································································································ 99
Configuring bidirectional control detection ········································································································ 99
Configuring single-hop echo detection ··············································································································· 99
Displaying and maintaining OSPF ····························································································································· 100
OSPF configuration examples ···································································································································· 101
Configuring basic OSPF ····································································································································· 101
Configuring OSPF route redistribution ·············································································································· 104
Configuring OSPF to advertise a summary route ····························································································· 106
Configuring an OSPF stub area························································································································· 108
Configuring an OSPF NSSA area ····················································································································· 111
Configuring OSPF DR election ··························································································································· 113
Configuring OSPF virtual links ··························································································································· 117
OSPF Graceful Restart configuration example ································································································· 119
OSPF NSR configuration example ···················································································································· 121
Configuring route filtering ·································································································································· 122
Configuring OSPF FRR ········································································································································ 125
Configuring BFD for OSPF ································································································································· 127
Troubleshooting OSPF configuration ························································································································· 130
