Configuring an Address Assignment Mode

The address assignment modes supported by the NetEngine 8000 F include NDRA, DHCPv6 (IA_NA), DHCPv6 (IA_PD), DHCPv6 (IA_NA)+PD (IA_PD), and NDRA+DHCPv6 (IA_PD). You can configure an address assignment mode as required.

Context

If an IPv4 network is upgraded to an IPv6 network, the CPE working mode and authentication mode do not need to be changed unless there are special service requirements.
- Layer 2 IPv6 leased line access equals the situation where the CPE works in unnumbered or numbered routing mode.
- Layer 3 users of a leased line obtain their addresses from the access router. The NetEngine 8000 F is in charge of only authentication and accounting, not address assignment.
In PPP authentication mode, either ND or DHCPv6 can be used for address assignment.

Procedure

The address assignment mode varies according to the CPE working mode. For details, see the following table.

CPE Working Mode	Scenario	IPv6 Address Configuration Mode
Bridging mode	A host initiates a connection request. A CPE transparently forwards user request packets, and the NetEngine 8000 F assigns an IPv6 address to the host.	NDRA
Bridging mode		DHCPv6 (IA_NA)
Unnumbered routing mode	A CPE initiates a connection request. After receiving the request, the NetEngine 8000 F assigns a prefix to the CPE to generate IPv6 addresses for the hosts attached to the CPE.	DHCPv6 (IA_PD)
Numbered routing mode	A CPE initiates a connection request. After receiving the request, the NetEngine 8000 F assigns an IPv6 address to the WAN interface on the CPE and a prefix to generate IPv6 addresses for the hosts attached to the CPE.	DHCPv6 (IA_NA)+PD (IA_PD)
Numbered routing mode		NDRA+DHCPv6 (IA_PD)

(Optional) In addition to choosing an address assignment mode, perform the following steps on the NetEngine 8000 F if needed:
1. Run system-view
  The system view is displayed.
2. Run aaa
  The AAA view is displayed.
3. Run domain domain-name
  An AAA domain is created, and the AAA domain view is displayed.
4. Run commit
  The configuration is committed.
5. Run user-basic-service-ip-type { ipv4 | ipv6 | ipv6-pd } ^*
  An IP type that is used for the services of users logging in from the domain is specified. If address assignment of the specified IP type fails, users are not allowed to log in.
6. Run ipv6 nd ra halt
  The NetEngine 8000 F is suppressed from sending RA messages to IPv6 access users.
7. Run ppp address-release separate
  PPP dual-stack users are allowed to go offline from a single stack.
  
  The ppp address-release separate and any-address-release offline commands are mutually exclusive.
8. Run commit
  The configuration is committed.