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Configuring OSPF DR election ··························································································································· 109

Configuring OSPF virtual links ··························································································································· 113

Configuring OSPF Graceful Restart ··················································································································· 115

Configuring route filtering ·································································································································· 118

Configuring OSPF FRR ········································································································································ 120

Configuring BFD for OSPF ································································································································· 122

Troubleshooting OSPF configuration ························································································································· 125

No OSPF neighbor relationship established ···································································································· 125

Incorrect routing information ······························································································································ 125

Configuring IS-IS ····················································································································································· 127

Hardware compatibility ··············································································································································· 127

IS-IS overview ······························································································································································· 127

Basic concepts ····················································································································································· 127

IS-IS area ······························································································································································ 129

IS-IS network type ················································································································································ 131

IS-IS PDU format ··················································································································································· 132

Supported IS-IS features ······································································································································ 138

Protocols and standards ····································································································································· 140

IS-IS configuration task list ··········································································································································· 140

Configuring IS-IS basic functions ································································································································ 141

Configuration prerequisites ································································································································ 141

Enabling IS-IS ······················································································································································· 141

Configuring the IS level and circuit level ·········································································································· 142

Configuring the network type of an interface as P2P ······················································································ 142

Configuring IS-IS routing information control ············································································································ 143

Configuring IS-IS link cost ··································································································································· 143

Specifying a priority for IS-IS ····························································································································· 144

Configuring the maximum number of ECMP routes ························································································ 145

Configuring IS-IS route summarization ·············································································································· 145

Advertising a default route ································································································································· 145

Configuring IS-IS route redistribution ················································································································ 146

Configuring IS-IS route filtering ·························································································································· 146

Configuring IS-IS route leaking ·························································································································· 147

Tuning and optimizing IS-IS networks ························································································································ 148

Specifying intervals for sending IS-IS hello and CSNP packets ····································································· 148

Specifying the IS-IS hello multiplier ···················································································································· 148

Configuring a DIS priority for an interface ······································································································· 149

Disabling an interface from sending or receiving IS-IS packets ····································································· 149

Enabling an interface to send small hello packets ··························································································· 149

Configuring LSP parameters ······························································································································· 150

Configuring SPF parameters ······························································································································ 152

Assigning a high priority to IS-IS routes ············································································································ 152

Setting the LSDB overload bit ····························································································································· 153

Configuring system ID to host name mappings ································································································ 153

Enabling the logging of neighbor state changes ····························································································· 154

Enhancing IS-IS network security ································································································································ 155

Configuring neighbor relationship authentication ··························································································· 155

Configuring area authentication ························································································································ 155

Configuring routing domain authentication ······································································································ 156

Configuring IS-IS GR ···················································································································································· 156

Configuring IS-IS NSR ·················································································································································· 157