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Configuration procedure ···································································································································· 204
Configuration example ······································································································································· 205
Configuring an automatic IPv4-compatible IPv6 tunnel ··························································································· 208
Configuration prerequisites ································································································································ 208
Configuration guidelines ···································································································································· 208
Configuration procedure ···································································································································· 208
Configuration example ······································································································································· 209
Configuring a 6to4 tunnel ··········································································································································· 212
Configuration prerequisites ································································································································ 212
Configuration guidelines ···································································································································· 212
Configuration procedure ···································································································································· 212
6to4 tunnel configuration example ··················································································································· 213
6to4 relay tunnel configuration example ·········································································································· 215
Configuring an ISATAP tunnel ···································································································································· 217
Configuration prerequisites ································································································································ 217
Configuration guidelines ···································································································································· 218
Configuration procedure ···································································································································· 218
Configuration example ······································································································································· 219
Displaying and maintaining tunneling configuration ······························································································· 221
Troubleshooting tunneling configuration ··················································································································· 221
Symptom ······························································································································································· 221
Solution ································································································································································· 222
Configuring GRE ····················································································································································· 223
Overview ······································································································································································· 223
GRE encapsulation format ·································································································································· 223
GRE encapsulation and de-encapsulation processes ······················································································ 224
GRE applications ················································································································································· 225
Protocols and standards ····································································································································· 226
Configuring a GRE over IPv4 tunnel ·························································································································· 226
Configuration guidelines ···································································································································· 226
Configuration prerequisites ································································································································ 227
Configuration procedure ···································································································································· 227
Displaying and maintaining GRE ······························································································································· 228
GRE over IPv4 tunnel configuration examples ·········································································································· 228
GRE over IPv4 tunnel configuration example 1 ······························································································· 228
GRE over IPv4 tunnel configuration example 2 ······························································································· 230
Troubleshooting GRE ··················································································································································· 232
Symptom ······························································································································································· 232
Solution ································································································································································· 232
Index ········································································································································································ 233
