iv
Troubleshooting OSPF configuration ························································································································· 134
No OSPF neighbor relationship established ···································································································· 134
Incorrect routing information ······························································································································ 134
Configuring IS-IS ····················································································································································· 136
IS-IS overview ······························································································································································· 136
Basic concepts ····················································································································································· 136
IS-IS area ······························································································································································ 138
IS-IS network type ················································································································································ 140
IS-IS PDUs ····························································································································································· 141
Supported IS-IS features ······································································································································ 148
Protocols and standards ····································································································································· 150
IS-IS configuration task list ··········································································································································· 151
Configuring IS-IS basic functions ································································································································ 152
Configuration prerequisites ································································································································ 152
Enabling IS-IS ······················································································································································· 152
Configuring the IS level and circuit level ·········································································································· 152
Configuring the network type of an interface as P2P ······················································································ 153
Configuring IS-IS routing information control ············································································································ 153
Configuration prerequisites ································································································································ 153
Configuring IS-IS link cost ··································································································································· 154
Specifying a priority for IS-IS ····························································································································· 155
Configuring the maximum number of equal cost routes·················································································· 155
Configuring IS-IS route summarization ·············································································································· 156
Advertising a default route ································································································································· 156
Configuring IS-IS route redistribution ················································································································ 156
Configuring IS-IS route filtering ·························································································································· 157
Configuring IS-IS route leaking ·························································································································· 158
Tuning and optimizing IS-IS networks ························································································································ 158
Configuration prerequisites ································································································································ 158
Specifying intervals for sending IS-IS hello and CSNP packets ····································································· 158
Specifying the IS-IS hello multiplier ···················································································································· 159
Configuring a DIS priority for an interface ······································································································· 159
Disabling an interface from sending/receiving IS-IS packets ········································································· 160
Disabling hello source address check for a PPP interface ·············································································· 160
Enabling an interface to send small hello packets ··························································································· 160
Configuring LSP parameters ······························································································································· 161
Configuring SPF parameters ······························································································································ 164
Setting the LSDB overload bit ····························································································································· 165
Configuring system ID to host name mappings ································································································ 165
Enabling the logging of neighbor state changes ····························································································· 166
Enhancing IS-IS network security ································································································································ 167
Configuration prerequisites ································································································································ 167
Configuring neighbor relationship authentication ··························································································· 167
Configuring area authentication ························································································································ 167
Configuring routing domain authentication ······································································································ 168
Configuring IS-IS GR ···················································································································································· 168
Configuring IS-IS FRR ··················································································································································· 169
Enabling IS-IS SNMP trap ··········································································································································· 170
Binding an IS-IS process with MIBs ···························································································································· 170
Configuring BFD for IS-IS············································································································································· 171
Displaying and maintaining IS-IS ······························································································································· 171
IS-IS configuration examples ······································································································································· 172
IS-IS basic configuration ····································································································································· 172
DIS election configuration ·································································································································· 176
