25 GR O VERVIEWIntroduction to Graceful Restart 247Basic Concepts in Graceful Restart 247Graceful Restart Communication Procedure 248Graceful Restart Mechanism for Several Commonly Used Protocols 25026 STATIC R OUTING C ONFIGURATIONIntroduction 251Configuring a Static Route 252Detecting Reachability of the Static Route’s Nexthop 253Displaying and Maintaining Static Routes 254Configuration Example 25427 RIP C ONFIGURATIONRIP Overview 257Configuring RIP Basic Functions 261Configuring RIP Route Control 263Configuring RIP Network Optimization 266Displaying and Maintaining RIP 269RIP Configuration Examples 269Troubleshooting RIP 27128 OSPF C ONFIGURATIONIntroduction to OSPF 273OSPF Configuration Task List 292Configuring OSPF Basic Functions 293Configuring OSPF Area Parameters 294Configuring OSPF Network Types 295Configuring OSPF Route Control 297Configuring OSPF Network Optimization 300Configuring OSPF Graceful Restart 306Displaying and Maintaining OSPF 309OSPF Configuration Examples 309Troubleshooting OSPF Configuration 32329 IS-IS CONFIGURATIONIS-IS Overview 325IS-IS Configuration Task List 340Configuring IS-IS Basic Functions 341Configuring IS-IS Routing Information Control 342Tuning and Optimizing IS-IS Network 346Configuring IS-IS GR 352Displaying and Maintaining IS-IS 353IS-IS Configuration Example 354
