iv
OSPF route summarization configuration example ················································································ 109
OSPF stub area configuration example ································································································· 112
OSPF NSSA area configuration example ······························································································ 114
OSPF DR election configuration example ······························································································ 116
OSPF virtual link configuration example ································································································ 121
OSPF GR configuration example ··········································································································· 123
OSPF NSR configuration example········································································································· 125
BFD for OSPF configuration example ···································································································· 127
OSPF FRR configuration example ········································································································· 130
Troubleshooting OSPF configuration ············································································································· 133
No OSPF neighbor relationship established ·························································································· 133
Incorrect routing information ·················································································································· 133
Configuring IS-IS ······················································································· 135
Overview ························································································································································ 135
Terminology ··········································································································································· 135
IS-IS address format ······························································································································ 135
NET ························································································································································ 136
IS-IS area ··············································································································································· 137
IS-IS network types ································································································································ 138
IS-IS PDUs ············································································································································· 139
Protocols and standards ························································································································ 141
IS-IS configuration task list····························································································································· 141
Configuring basic IS-IS ·································································································································· 142
Configuration prerequisites ···················································································································· 142
Enabling IS-IS ········································································································································ 143
Setting the IS level and circuit level ······································································································· 143
Configuring P2P network type for an interface ······················································································· 143
Configuring IS-IS route control ······················································································································· 144
Configuration prerequisites ···················································································································· 144
Configuring IS-IS link cost ······················································································································ 144
Specifying a preference for IS-IS ··········································································································· 145
Configuring the maximum number of ECMP routes ··············································································· 146
Configuring IS-IS route summarization ·································································································· 146
Advertising a default route ····················································································································· 147
Configuring IS-IS route redistribution ····································································································· 147
Configuring IS-IS route filtering ·············································································································· 148
Configuring IS-IS route leaking ·············································································································· 149
Advertising IS-IS link state information to BGP ······················································································ 149
Tuning and optimizing IS-IS networks ··········································································································· 150
Configuration prerequisites ···················································································································· 150
Specifying the interval for sending IS-IS hello packets ·········································································· 150
Specifying the IS-IS hello multiplier········································································································ 150
Specifying the interval for sending IS-IS CSNP packets ········································································ 151
Configuring a DIS priority for an interface ······························································································ 151
Disabling an interface from sending/receiving IS-IS packets ································································· 151
Enabling an interface to send small hello packets ················································································· 152
Configuring LSP parameters ·················································································································· 152
Controlling SPF calculation interval ······································································································· 155
Configuring convergence priorities for specific routes ··········································································· 156
Setting the LSDB overload bit ················································································································ 156
Configuring the ATT bit ·························································································································· 157
Configuring the tag value for an interface ······························································································ 157
Configuring system ID to host name mappings ····················································································· 158
Enabling the logging of neighbor state changes ···················································································· 159
Enabling IS-IS ISPF ······························································································································· 159
Enabling prefix suppression ··················································································································· 159
Configuring IS-IS network management ································································································ 160
Configuring IS-IS PIC ····························································································································· 160
Enhancing IS-IS network security ·················································································································· 161
Configuration prerequisites ···················································································································· 162
Configuring neighbor relationship authentication ··················································································· 162
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