iv
OSPF NSSA area configuration example ········································································································ 107
OSPF DR election configuration example ········································································································· 109
OSPF virtual link configuration example ··········································································································· 113
OSPF GR configuration example ······················································································································· 115
OSPF NSR configuration example ···················································································································· 117
BFD for OSPF configuration example ··············································································································· 119
OSPF FRR configuration example ······················································································································ 122
Troubleshooting OSPF configuration ························································································································· 124
No OSPF neighbor relationship established ···································································································· 124
Incorrect routing information ······························································································································ 124
Configuring IS-IS ····················································································································································· 126
Overview ······································································································································································· 126
Terminology ························································································································································· 126
IS-IS address format ············································································································································· 126
NET ······································································································································································· 127
IS-IS area ······························································································································································ 128
IS-IS network types ·············································································································································· 130
IS-IS PDUs ····························································································································································· 131
Protocols and standards ····································································································································· 132
IS-IS configuration task list ··········································································································································· 133
Configuring basic IS-IS ················································································································································ 134
Configuration prerequisites ································································································································ 134
Enabling IS-IS ······················································································································································· 134
Configuring the IS level and circuit level ·········································································································· 134
Configuring P2P network type for an interface ································································································ 135
Configuring IS-IS route control ···································································································································· 135
Configuration prerequisites ································································································································ 135
Configuring IS-IS link cost ··································································································································· 136
Specifying a preference for IS-IS ······················································································································· 137
Configuring the maximum number of ECMP routes ························································································ 137
Configuring IS-IS route summarization ·············································································································· 138
Advertising a default route ································································································································· 138
Configuring IS-IS route redistribution ················································································································ 139
Configuring IS-IS route filtering ·························································································································· 139
Configuring IS-IS route leaking ·························································································································· 140
Tuning and optimizing IS-IS networks ························································································································ 141
Configuration prerequisites ································································································································ 141
Specifying the interval for sending IS-IS hello packets ···················································································· 141
Specifying the IS-IS hello multiplier ···················································································································· 141
Specifying the interval for sending IS-IS CSNP packets ·················································································· 142
Configuring a DIS priority for an interface ······································································································· 142
Disabling an interface from sending/receiving IS-IS packets ········································································· 142
Enabling an interface to send small hello packets ··························································································· 143
Configuring LSP parameters ······························································································································· 143
Controlling SPF calculation interval ··················································································································· 146
Configuring convergence priorities for specific routes ···················································································· 146
Setting the LSDB overload bit ····························································································································· 146
Configuring system ID to host name mappings ································································································ 147
Enabling the logging of neighbor state changes ····························································································· 148
Enabling IS-IS ISPF ··············································································································································· 148
Configuring IS-IS network management ············································································································ 149
Enhancing IS-IS network security ································································································································ 150
Configuration prerequisites ································································································································ 150
Configuring neighbor relationship authentication ··························································································· 150
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