viii
Symptom ················································································································································ 235
Solution ·················································································································································· 235
DHCPv6 overview ······················································································· 236
Feature and hardware compatibility ··············································································································· 236
DHCPv6 address/prefix assignment ·············································································································· 236
Rapid assignment involving two messages ··························································································· 236
Assignment involving four messages ····································································································· 236
Address/prefix lease renewal ························································································································· 237
Stateless DHCPv6 ········································································································································· 238
Protocols and standards ································································································································ 238
Configuring the DHCPv6 server ·································································· 240
Overview ························································································································································ 240
IPv6 address assignment ······················································································································· 240
IPv6 prefix assignment ··························································································································· 240
Concepts ················································································································································ 241
DHCPv6 address pool ···························································································································· 241
IPv6 address/prefix allocation sequence ································································································ 242
Configuration task list ····································································································································· 243
Configuring IPv6 prefix assignment ··············································································································· 243
Configuration guidelines ························································································································· 243
Configuration procedure ························································································································· 244
Configuring IPv6 address assignment ··········································································································· 244
Configuration guidelines ························································································································· 245
Configuration procedure ························································································································· 245
Configuring network parameters assignment ································································································ 246
Configuring network parameters in a DHCPv6 address pool ································································· 246
Configuring network parameters in a DHCPv6 option group ································································· 247
Configuring the DHCPv6 server on an interface ···························································································· 247
Configuration guidelines ························································································································· 247
Configuration procedure ························································································································· 248
Setting the DSCP value for DHCPv6 packets sent by the DHCPv6 server ··················································· 248
Configuring DHCPv6 binding auto backup ···································································································· 248
Advertising subnets assigned to clients ········································································································· 249
Applying a DHCPv6 address pool to a VPN instance ···················································································· 250
Configuring DHCPv6 logging on the DHCPv6 server ···················································································· 250
Displaying and maintaining the DHCPv6 server ···························································································· 251
DHCPv6 server configuration examples ········································································································ 252
Dynamic IPv6 prefix assignment configuration example········································································ 252
Dynamic IPv6 address assignment configuration example ···································································· 254
Configuring the DHCPv6 relay agent ·························································· 257
Overview ························································································································································ 257
DHCPv6 relay agent configuration task list ···································································································· 258
Enabling the DHCPv6 relay agent on an interface ························································································ 258
Specifying DHCPv6 servers on the relay agent ····························································································· 258
Setting the DSCP value for DHCPv6 packets sent by the DHCPv6 relay agent ··········································· 259
Specifying a padding mode for the Interface-ID option ·················································································· 259
Configuring a DHCPv6 relay address pool ···································································································· 260
Specifying a gateway address for DHCPv6 clients ························································································ 260
Displaying and maintaining the DHCPv6 relay agent ···················································································· 261
DHCPv6 relay agent configuration example ·································································································· 261
Network requirements ···························································································································· 261
Configuration procedure ························································································································· 262
Verifying the configuration ······················································································································ 262
Configuring the DHCPv6 client ··································································· 264
Overview ························································································································································ 264
Configuration restrictions and guidelines ······································································································· 264
DHCPv6 client configuration task list ············································································································· 264
Configuring IPv6 address acquisition ············································································································· 264
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