iv
OSPF DR election configuration example ········································································································· 107
OSPF virtual link configuration example ··········································································································· 111
OSPF GR configuration example ······················································································································· 113
BFD for OSPF configuration example ··············································································································· 115
OSPF FRR configuration example ······················································································································ 118
Troubleshooting OSPF configuration ························································································································· 120
No OSPF neighbor relationship established ···································································································· 120
Incorrect routing information ······························································································································ 120
Configuring IS-IS ····················································································································································· 122
Overview ······································································································································································· 122
Terminology ························································································································································· 122
IS-IS address format ············································································································································· 122
NET ······································································································································································· 123
IS-IS area ······························································································································································ 124
IS-IS network types ·············································································································································· 126
IS-IS PDUs ····························································································································································· 127
Protocols and standards ····································································································································· 128
IS-IS configuration task list ··········································································································································· 129
Configuring basic IS-IS ················································································································································ 130
Configuration prerequisites ································································································································ 130
Enabling IS-IS ······················································································································································· 130
Configuring the IS level and circuit level ·········································································································· 131
Configuring P2P network type for an interface ································································································ 131
Configuring IS-IS route control ···································································································································· 132
Configuration prerequisites ································································································································ 132
Configuring IS-IS link cost ··································································································································· 132
Specifying a preference for IS-IS ······················································································································· 133
Configuring the maximum number of ECMP routes ························································································ 134
Configuring IS-IS route summarization ·············································································································· 134
Advertising a default route ································································································································· 134
Configuring IS-IS route redistribution ················································································································ 135
Configuring IS-IS route filtering ·························································································································· 135
Configuring IS-IS route leaking ·························································································································· 136
Tuning and optimizing IS-IS networks ························································································································ 137
Configuration prerequisites ································································································································ 137
Specifying the interval for sending IS-IS hello packets ···················································································· 137
Specifying the IS-IS hello multiplier ···················································································································· 137
Specifying the interval for sending IS-IS CSNP packets ·················································································· 138
Configuring a DIS priority for an interface ······································································································· 138
Disabling source address check for hello packets on a PPP interface ··························································· 138
Disabling an interface from sending/receiving IS-IS packets ········································································· 139
Enabling an interface to send small hello packets ··························································································· 139
Configuring LSP parameters ······························································································································· 140
Controlling SPF calculation interval ··················································································································· 143
Configuring convergence priorities for specific routes ···················································································· 143
Setting the LSDB overload bit ····························································································································· 144
Configuring system ID to host name mappings ································································································ 144
Enabling the logging of neighbor state changes ····························································································· 145
Enabling IS-IS ISPF ··············································································································································· 146
Configuring IS-IS network management ············································································································ 146
Enhancing IS-IS network security ································································································································ 147
Configuration prerequisites ································································································································ 147
Configuring neighbor relationship authentication ··························································································· 147
Configuring area authentication ························································································································ 147
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