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IS-IS PDUs ············································································································································· 129

Protocols and standards ························································································································ 131

IS-IS configuration task list ···························································································································· 131

Configuring basic IS-IS ·································································································································· 132

Configuration prerequisites ···················································································································· 132

Enabling IS-IS ········································································································································ 132

Configuring the IS level and circuit level ································································································ 133

Configuring P2P network type for an interface ······················································································· 133

Configuring IS-IS route control ······················································································································· 134

Configuration prerequisites ···················································································································· 134

Configuring IS-IS link cost ······················································································································ 134

Specifying a preference for IS-IS ··········································································································· 135

Configuring the maximum number of ECMP routes ··············································································· 136

Configuring IS-IS route summarization ·································································································· 136

Advertising a default route ····················································································································· 136

Configuring IS-IS route redistribution ····································································································· 137

Configuring IS-IS route filtering ·············································································································· 137

Configuring IS-IS route leaking ·············································································································· 138

Tuning and optimizing IS-IS networks ··········································································································· 139

Configuration prerequisites ···················································································································· 139

Specifying the interval for sending IS-IS hello packets ·········································································· 139

Specifying the IS-IS hello multiplier ········································································································ 139

Specifying the interval for sending IS-IS CSNP packets ········································································ 140

Configuring a DIS priority for an interface ······························································································ 140

Enabling source address check for hello packets on a PPP interface ··················································· 140

Disabling an interface from sending/receiving IS-IS packets ································································· 141

Enabling an interface to send small hello packets ················································································· 141

Configuring LSP parameters ·················································································································· 141

Controlling SPF calculation interval ······································································································· 144

Configuring convergence priorities for specific routes ··········································································· 144

Setting the LSDB overload bit ················································································································ 144

Configuring system ID to host name mappings ····················································································· 145

Enabling the logging of neighbor state changes ···················································································· 146

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 ············································································································· 148

Configuring routing domain authentication ····························································································· 148

Configuring IS-IS GR ····································································································································· 149

Configuring IS-IS NSR ··································································································································· 150

Configuring BFD for IS-IS ······························································································································ 150

Configuring IS-IS FRR ··································································································································· 151

Configuration prerequisites ···················································································································· 151

Configuration guidelines ························································································································· 151

Configuring IS-IS FRR to automatically calculate a backup next hop ···················································· 151

Configuring IS-IS FRR using a routing policy ························································································· 152

Configuring BFD for IS-IS FRR ·············································································································· 152

Displaying and maintaining IS-IS ··················································································································· 152

IS-IS configuration examples ························································································································· 153

Basic IS-IS configuration example ········································································································· 153

DIS election configuration example ········································································································ 158

IS-IS route redistribution configuration example ···················································································· 162

IS-IS authentication configuration example ···························································································· 165

IS-IS GR configuration example ············································································································· 168

IS-IS NSR configuration example ·········································································································· 169

BFD for IS-IS configuration example ······································································································ 172

IS-IS FRR configuration example ··········································································································· 175

Configuring BGP ························································································· 178

Overview ························································································································································ 178