
vii
Configuration restrictions ·······························································································································172
Enabling DHCPv6 snooping ··························································································································172
Configuring a DHCPv6 snooping trusted port································································································172
Configuring the maximum number of DHCPv6 snooping entries an interface can learn·······························173
Configuring DHCPv6 snooping to support Option 18 and Option 37·····························································173
Configuring DHCPv6 snooping entry backup ································································································174
Displaying and maintaining DHCPv6 snooping ·····························································································175
DHCPv6 snooping configuration example ·····································································································175
Network requirements····························································································································175
Configuration procedure·························································································································176
Verifying the configuration······················································································································176
Configuring IPv6 DNS·················································································177
Configuring the IPv6 DNS client ····················································································································177
Configuring static domain name resolution····························································································177
Configuring dynamic domain name resolution·······················································································177
Setting the DSCP value for IPv6 DNS packets······························································································178
Displaying and maintaining IPv6 DNS ···········································································································178
IPv6 DNS configuration examples ·················································································································178
Static domain name resolution configuration example···········································································178
Dynamic domain name resolution configuration example······································································179
Configuring tunneling··················································································185
Overview························································································································································185
IPv6 over IPv4 tunneling························································································································185
IPv4 over IPv4 tunneling························································································································187
IPv4 over IPv6 tunneling························································································································188
IPv6 over IPv6 tunneling························································································································189
Protocols and standards ························································································································189
Tunneling configuration task list·····················································································································189
Configuring a tunnel interface························································································································190
Configuration prerequisites····················································································································190
Configuration guidelines·························································································································190
Configuration procedure·························································································································190
Configuring an IPv6 manual tunnel················································································································192
Configuration prerequisites····················································································································192
Configuration guidelines·························································································································192
Configuration procedure·························································································································192
Configuration example···························································································································193
Configuring a 6to4 tunnel·······························································································································196
Configuration prerequisites····················································································································196
Configuration guidelines·························································································································196
Configuration procedure·························································································································196
Configuration example···························································································································197
Configuring an ISATAP tunnel·······················································································································200
Configuration prerequisites····················································································································200
Configuration guidelines·························································································································200
Configuration procedure·························································································································200
Configuration example···························································································································201
Configuring an IPv4 over IPv4 tunnel ············································································································203
Configuration prerequisites····················································································································203
Configuration guidelines·························································································································203
Configuration procedure·························································································································204
Configuration example···························································································································204
Configuring an IPv4 over IPv6 tunnel ············································································································208
Configuration prerequisites····················································································································208
Configuration guidelines·························································································································208
Configuration procedure·························································································································208
Configuration example···························································································································209
Configuring an IPv6 over IPv6 tunnel ············································································································212
Configuration prerequisites····················································································································212
Configuration guidelines·························································································································212