iii
Tuning and optimizing OSPF networks ························································································································ 67
Configuration prerequisites ·································································································································· 67
Configuring OSPF timers ······································································································································ 68
Specifying LSA transmission delay ······················································································································ 68
Specifying SPF calculation interval ······················································································································ 69
Specifying the LSA arrival interval ······················································································································· 69
Specifying the LSA generation interval ··············································································································· 70
Disabling interfaces from receiving and sending OSPF packets ······································································ 70
Configuring stub routers ······································································································································· 71
Configuring OSPF authentication ························································································································ 71
Adding the interface MTU into DD packets ········································································································ 72
Configuring the maximum number of external LSAs in LSDB ··········································································· 72
Configuring OSPF exit overflow interval ············································································································· 73
Enabling compatibility with RFC 1583 ··············································································································· 73
Logging neighbor state changes ·························································································································· 73
Configuring OSPF network management ··········································································································· 74
Configuring the LSU transmit rate ························································································································ 74
Enabling OSPF ISPF ·············································································································································· 75
Configuring OSPF GR ··················································································································································· 75
Configuring the OSPF GR Restarter ····················································································································· 75
Configuring OSPF GR Helper ······························································································································ 76
Triggering OSPF GR ············································································································································· 77
Configuring BFD for OSPF ············································································································································ 77
Configuring bidirectional control detection ········································································································ 77
Configuring single-hop echo detection ··············································································································· 78
Configuring OSPF FRR ··················································································································································· 78
Configuration prerequisites ·································································································································· 79
Configuration guidelines ······································································································································ 79
Configuring OSPF FRR to calculate a backup next hop using the LFA algorithm ·········································· 79
Configuring OSPF FRR to specify a backup next hop using a routing policy ················································· 79
Displaying and maintaining OSPF ······························································································································· 80
OSPF configuration examples ······································································································································ 81
Configuring basic OSPF ······································································································································· 81
Configuring OSPF route redistribution ················································································································ 84
Configuring OSPF to advertise a summary route ······························································································· 85
Configuring an OSPF stub area··························································································································· 88
Configuring an OSPF NSSA area ······················································································································· 91
Configuring OSPF DR election ····························································································································· 93
Configuring OSPF virtual links ····························································································································· 97
Configuring OSPF GR ··········································································································································· 99
Configuring BFD for OSPF ································································································································· 101
Configuring OSPF FRR ········································································································································ 104
Troubleshooting OSPF configuration ························································································································· 106
No OSPF neighbor relationship established ···································································································· 106
Incorrect routing information ······························································································································ 107
Configuring IS-IS ····················································································································································· 108
Overview ······································································································································································· 108
Terminology ························································································································································· 108
IS-IS address format ············································································································································· 108
NET ······································································································································································· 109
IS-IS area ······························································································································································ 110
IS-IS network types ·············································································································································· 112
IS-IS PDUs ····························································································································································· 113
Protocols and standards ····································································································································· 114
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