KB.15.15

About influencing route choices by changing the administrative distance default (optional).............259

About enforcing strict LSA operation for graceful restart helper mode (optional).............................259

About adjusting performance by changing the VLAN interface settings (optional)..........................260

About configuring an ABR to use a virtual link to the backbone..................................................260

About adjusting virtual link performance by changing the interface settings.............................261

OSPFv3 passive...................................................................................................................261

11 IPv6 Tunneling Over IPv4 Using Manually Configured Tunnels.....................262

Overview............................................................................................................................262

Configuring a Tunnel Interface................................................................................................263

Configuring the Tunnel Mode............................................................................................264

Configuring the Tunnel Source...........................................................................................264

Configuring the Tunnel Destination.....................................................................................264

Configuring the Static MTU...............................................................................................265

Configuring a Value for TOS.............................................................................................265

Configuring a Value for Time-to-Live (TTL)............................................................................265

Example: Manual 6in4 Tunneling...........................................................................................266

Configure Switch B...........................................................................................................266

Configure Switch C..........................................................................................................268

Example: Tunneling Using Policy-Based Routing (PBR)................................................................269

Configure Switch B...........................................................................................................269

Configure Switch C..........................................................................................................270

Displaying Tunnel Configuration and Status Information.............................................................271

Show Interface Tunnel Brief...............................................................................................272

Show IPv6 ND RA Prefix for a Specific Tunnel......................................................................272

Show IP Counters for a Tunnel...........................................................................................274

12 IPv6 Diagnostic and Troubleshooting.......................................................277

Introduction..........................................................................................................................277

ICMP Rate-Limiting................................................................................................................277

Ping for IPv6 (Ping6).............................................................................................................278

Traceroute for IPv6................................................................................................................279

DNS Resolver for IPv6...........................................................................................................281

DNS Configuration..........................................................................................................282

Viewing the Current Configuration......................................................................................283

Operating Notes.............................................................................................................283

Debug/Syslog for IPv6..........................................................................................................283

Configuring Debug and Event Log Messaging.....................................................................284

Debug Command............................................................................................................284

Configuring Debug Destinations.........................................................................................285

Configuring an IPv6 Syslog Server.....................................................................................286

Logging Command..........................................................................................................286

Displaying a Debug/Syslog for Configuration......................................................................287

Index.......................................................................................................288

10 Contents