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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

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

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

Configuring neighbor relationship authentication ··························································································· 147

Configuring area authentication ························································································································ 147