Configuring a DHCPv6 Server Group

Procedure

1. Run system-view

   The system view is displayed.

2. Run dhcpv6-server group group-name

   A DHCPv6 server group is created and the DHCPv6 server group view is displayed.

3. Run commit

   The configuration is committed.

4. Run dhcpv6-server { destination ipv6-address [ vpn-instance vpn-instance ] | interface interface-type interface-number } [ weight weight-value ]

   An IPv6 address or an outbound interface is configured for a DHCPv6 server.

   A maximum of eight DHCPv6 servers can be configured in a DHCPv6 server group.

5. (Optional) Run dhcpv6-server algorithm { loading-share | master-backup | polling }

   The algorithm for selecting DHCPv6 servers is configured.

   This algorithm takes effect only when the DHCPv6 server group contains multiple servers. The available algorithms are load balancing, master/backup, and polling.

   • Load balancing: Traffic is distributed based on the weights of DHCPv6 servers.
   • Master/backup: The first server that you configure is the master server and the others are backup servers.
   • Polling: The NetEngine 8000 F sends Solicit, Request, Rebind, and Confirm messages to all servers in the DHCPv6 server group and selects the server that first responds to the request message for subsequent message exchanges.

6. (Optional) Run release-agent

   The DHCPv6 release agent function is enabled.

   When a user wants to go offline and the DHCPv6 release agent function is enabled, the NetEngine 8000 F, instead of the user, sends DHCPv6 Release messages to DHCPv6 servers.

7. (Optional) Run dhcpv6-server source { interface interface-type interface-name | link-address }

   The source address or source interface of the messages to be sent to servers in the DHCPv6 server group is configured.

8. Run quit

   Return to the system view.

9. (Optional) Configure the NetEngine 8000 F to insert Option 18 and Option 37 into the Relay-Forward messages to be sent to a DHCPv6 server.
   1. Run interface interface-type interface-number

      The interface view is displayed.

   2. Run the dhcpv6 relay option-insert mode type1 [ remote-id { neba | vula } ] command to configure the device to insert the Option 18 and Option 37 attributes in OSP format into the Relay-Forward messages to be sent to the DHCPv6 server. Alternatively, run the dhcpv6 relay option-insert option-code2 mode cn-telecom version2 command to insert the Option 18 attribute into the Relay-Forward messages to be sent to the DHCPv6 server.
      

      • The dhcpv6 relay option-insert mode type1 [ remote-id { neba | vula } ] command, the dhcpv6 relay option-insert option-code2 mode cn-telecom version2 command, and the dhcpv6 relay option-insert { interface-id mode { cn-telecom | tr-101 } | remote-id } command are mutually exclusive.
      • The dhcpv6 relay option-insert mode type1 [ remote-id { neba | vula } ] command takes effect in real time. After the command configuration is added, the device enables the function to insert the Option 18 and Option 37 attributes into the messages to be sent to the DHCPv6 server in the OSP format for online users on the current interface. After the command configuration is deleted, the device disables this function for online users on the current interface.
      • The dhcpv6 relay option-insert option-code2 mode cn-telecom version2 command takes effect in real time. After the command configuration is added, the device enables the function to insert the Option 18 attribute into the Relay-Forward messages to be sent to the DHCPv6 server for online users on the current interface. After the command configuration is deleted, the device disables this function for online users on the current interface.
      • The dhcpv6 relay option-insert { interface-id mode { cn-telecom | tr-101 } | remote-id } command takes effect in real time in BAS relay scenarios. After the command configuration is added, the device enables the function to insert the Option 18 and Option 37 attributes into the messages to be sent to the DHCPv6 server in the specified format for online users on the current interface. After the command configuration is deleted, the device disables this function for online users on the current interface.

   3. Run quit

      Return to the system view.

10. (Optional) Configure the NetEngine 8000 F to insert Option 79 into the Relay-Forward messages to be sent to a DHCPv6 server.
    1. Run interface interface-type interface-number

       The interface view is displayed.

    2. Run dhcpv6 relay option-insert option-code1

       The NetEngine 8000 F is configured to insert Option 79 into the Relay-Forward messages to be sent to a DHCPv6 server.

    3. Run quit

       Return to the system view.

11. (Optional) Run dhcpv6-server [ ipv6-address [ vpn-instance vpn-instance-name ] ] { dead-count dead-count | timeout timeout-value | dead-time dead-time } *

    The threshold for the DHCPv6 server to alternate between up and down is configured.

12. (Optional) Configure CAR for whitelisted DHCPv6 sessions.
    1. (Optional) Run undo whitelist session-car dhcpv6-server disable

       Whitelist session-CAR for DHCPv6 is enabled.

    2. Run whitelist session-car dhcpv6-server { cir cir-value | cbs cbs-value | pir pir-value | pbs pbs-value } *

       The bandwidth parameters of whitelist session-CAR for DHCPv6 are configured.

13. Run commit

    The configuration is committed.