x
Configuring the aging time for IPv6 fast forwarding entries ··········································································· 306
Configuring IPv6 fast forwarding load sharing ······························································································· 307
Displaying and maintaining IPv6 fast forwarding ··························································································· 307
Configuring tunneling ·················································································· 308
Overview ························································································································································ 308
IPv6 over IPv4 tunneling ························································································································ 308
IPv4 over IPv4 tunneling ························································································································ 310
IPv4 over IPv6 tunneling ························································································································ 311
IPv6 over IPv6 tunneling ························································································································ 315
Protocols and standards ························································································································ 315
Compatibility information ································································································································ 316
Feature and hardware compatibility ······································································································· 316
Command and hardware compatibility ··································································································· 316
Tunneling configuration task list ····················································································································· 316
Configuring a tunnel interface ························································································································ 317
Configuring an IPv6 over IPv4 manual tunnel ································································································ 318
Configuration example ··························································································································· 319
Configuring an automatic IPv4-compatible IPv6 tunnel ················································································· 321
Configuration example ··························································································································· 322
Configuring a 6to4 tunnel ······························································································································· 323
6to4 tunnel configuration example ········································································································· 324
6to4 relay configuration example ··········································································································· 325
Configuring an ISATAP tunnel ······················································································································· 327
Configuration example ··························································································································· 328
Configuring an IPv4 over IPv4 tunnel ············································································································ 330
Configuration example ··························································································································· 331
Configuring an IPv4 over IPv6 manual tunnel ································································································ 333
Configuration example ··························································································································· 334
Configuring a DS-Lite tunnel ·························································································································· 335
Configuration example ··························································································································· 337
Configuring an IPv6 over IPv6 tunnel ············································································································ 339
Configuration example ··························································································································· 340
Displaying and maintaining tunneling configuration ······················································································· 342
Troubleshooting tunneling configuration ········································································································ 342
Symptom ················································································································································ 342
Analysis ·················································································································································· 342
Solution ·················································································································································· 342
Configuring GRE ························································································· 343
Overview ························································································································································ 343
GRE encapsulation format ····················································································································· 343
GRE tunnel operating principle ·············································································································· 343
GRE security mechanisms ····················································································································· 344
GRE application scenarios ····················································································································· 344
Protocols and standards ························································································································ 346
Configuring a GRE/IPv4 tunnel ······················································································································ 347
Configuration guidelines ························································································································· 347
Configuration procedure ························································································································· 347
Configuring a GRE/IPv6 tunnel ······················································································································ 349
Configuration guidelines ························································································································· 349
Configuration procedure ························································································································· 349
Displaying and maintaining GRE ··················································································································· 351
GRE configuration examples ························································································································· 351
Configuring an IPv4 over IPv4 GRE tunnel ···························································································· 351
Configuring an IPv4 over IPv6 GRE tunnel ···························································································· 353
Troubleshooting GRE ···································································································································· 356
Symptom ················································································································································ 356
Analysis ·················································································································································· 356
Solution ·················································································································································· 356
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