iv
OSPF Configuration Examples·············································································································4-51
Configuring OSPF Basic Functions·······························································································4-51
Configuring OSPF Route Redistribution························································································4-54
Configuring OSPF to Advertise a Summary Route·······································································4-55
Configuring an OSPF Stub Area ···································································································4-58
Configuring an OSPF NSSA Area·································································································4-61
Configuring OSPF DR Election ·····································································································4-62
Configuring OSPF Virtual Links·····································································································4-67
Configuring OSPF Graceful Restart······························································································4-69
Configuring Route Filtering············································································································4-70
Configuring BFD for OSPF············································································································4-73
Troubleshooting OSPF Configuration···································································································4-75
No OSPF Neighbor Relationship Established···············································································4-75
Incorrect Routing Information ········································································································4-76
5 IS-IS Configuration ····································································································································5-1
IS-IS Overview ········································································································································5-1
Basic Concepts································································································································5-2
IS-IS Area········································································································································5-3
IS-IS Network Type ·························································································································5-6
IS-IS PDU Format····························································································································5-7
Supported IS-IS Features··············································································································5-13
Protocols and Standards ···············································································································5-16
IS-IS Configuration Task List ················································································································5-17
Configuring IS-IS Basic Functions ········································································································5-18
Configuration Prerequisites ···········································································································5-18
Enabling IS-IS································································································································5-18
Configuring the IS Level and Circuit Level ····················································································5-18
Configuring the Network Type of an Interface as P2P··································································5-19
Configuring IS-IS Routing Information Control ·····················································································5-20
Configuration Prerequisites ···········································································································5-20
Configuring IS-IS Link Cost ···········································································································5-20
Specifying a Priority for IS-IS ········································································································5-22
Configuring the Maximum Number of Equal Cost Routes ····························································5-22
Configuring IS-IS Route Summarization ·······················································································5-23
Advertising a Default Route···········································································································5-23
Configuring IS-IS Route Redistribution ·························································································5-24
Configuring IS-IS Route Filtering···································································································5-24
Configuring IS-IS Route Leaking···································································································5-25
Tuning and Optimizing IS-IS Networks·································································································5-26
Configuration Prerequisites ···········································································································5-26
Specifying Intervals for Sending IS-IS Hello and CSNP Packets ·················································5-26
Specifying the IS-IS Hello Multiplier ······························································································5-26
Configuring a DIS Priority for an Interface·····················································································5-27
Disabling an Interface from Sending/Receiving IS-IS Packets ·····················································5-27
Enabling an Interface to Send Small Hello Packets······································································5-28
