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viii
Setting the maximum number of DHCPv6 snooping entries ···················································································· 201
Enabling DHCPv6-REQUEST check ···························································································································· 202
Configuring DHCPv6 packet rate limit ······················································································································ 202
Displaying and maintaining DHCPv6 snooping ······································································································· 203
DHCPv6 snooping configuration example ················································································································ 203
Network requirements ········································································································································· 203
Configuration procedure ···································································································································· 204
Verifying the configuration ································································································································· 204
Configuring IPv6 fast forwarding ··························································································································· 205
Overview ······································································································································································· 205
Configuration procedure ············································································································································· 205
Displaying and maintaining IPv6 fast forwarding ···································································································· 205
Configuring tunneling ············································································································································· 206
Overview ······································································································································································· 206
IPv6 over IPv4 tunneling ····································································································································· 206
IPv4 over IPv4 tunneling ····································································································································· 208
IPv4 over IPv6 tunneling ····································································································································· 209
IPv6 over IPv6 tunneling ····································································································································· 210
Protocols and standards ····································································································································· 210
Tunneling configuration task list ································································································································· 211
Configuring a tunnel interface ···································································································································· 211
Configuring an IPv6 over IPv4 manual tunnel ··········································································································· 213
Configuration example ······································································································································· 214
Configuring a 6to4 tunnel ··········································································································································· 216
Configuration example ······································································································································· 217
Configuring an ISATAP tunnel ···································································································································· 219
Configuration example ······································································································································· 220
Configuring an IPv4 over IPv4 tunnel ························································································································ 222
Configuration example ······································································································································· 223
Configuring an IPv4 over IPv6 tunnel ························································································································ 225
Configuration example ······································································································································· 226
Configuring an IPv6 over IPv6 tunnel ························································································································ 228
Configuration example ······································································································································· 229
Displaying and maintaining tunneling configuration ······························································································· 231
Troubleshooting tunneling ··········································································································································· 231
Symptom ······························································································································································· 231
Analysis ································································································································································ 231
Solution ································································································································································· 232
Configuring GRE ····················································································································································· 233
Overview ······································································································································································· 233
GRE encapsulation format ·································································································································· 233
GRE tunnel operating principle ·························································································································· 234
Protocols and standards ····································································································································· 234
Configuring a GRE over IPv4 tunnel ·························································································································· 235
Configuring a GRE over IPv6 tunnel ·························································································································· 236
Displaying and maintaining GRE ······························································································································· 238
GRE configuration examples ······································································································································ 239
GRE over IPv4 tunnel configuration example ··································································································· 239
GRE over IPv6 tunnel configuration example ··································································································· 241
Troubleshooting GRE ··················································································································································· 244
Symptom ······························································································································································· 244
Analysis ································································································································································ 244
Solution ································································································································································· 245
