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NE40E-M2 V800R010C10SPC500 Feature Description - User Access 01

This is NE40E-M2 V800R010C10SPC500 Feature Description - User Access
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IPv6 Address Management

IPv6 Address Management

Address Pool

The BRAS uses address pools to manage addresses, such as allocating, renewing, and reclaiming addresses. The BRAS provides gateway information for access users. Address pools are classified into the following types:

  • Local address pool

    The BRAS manages local address pools on its own. The BRAS is in charge of allocating, renewing, and reclaiming IP addresses in local address pools. A local address pool is used when the BRAS allocates a shared IPv6 prefix in ND mode or allocates an IPv6 prefix in DHCPv6 IA_PD mode.

  • Delegation address pool

    A delegation address pool is used when the BRAS allocates an unshared IPv6 prefix in ND mode or allocates an IPv6 prefix in DHCPv6 IA_PD mode. The global unicast addresses for ND users are generated based on prefixes and interface IDs.

  • Remote address pool

    A remote address pool is used when an external DHCPv6 server is used.

  • Table 4-1 Mapping between address pools and address allocation

    CPE Working Mode

    IPv6 Address Allocation Mode to WAN interfaces

    IPv6 Address Allocation Mode to LAN interfaces

    Address Pool Type to WAN interfaces Address Pool Type to LAN interfaces

    Numbered routing mode

    ND(shared mode) DHCPv6-PD Local Delegation

    Numbered routing mode

    ND(unshared mode) DHCPv6-PD Delegation Delegation

    Numbered routing mode

    DHCPv6 (local address pool) DHCPv6-PD Local Delegation

    Numbered routing mode

    DHCPv6(remote address pool) DHCPv6-PD Remote Remote

    Unnumbered routing mode

    NA DHCPv6-PD NA Delegation

    Bridging mode

    ND(shared mode) NA Local NA

    Bridging mode

    ND(unshared mode) NA Delegation NA

    Bridging mode

    DHCPv6(local address pool) NA Local NA

    Bridging mode

    DHCPv6(remote address pool) NA Remote NA

    Bridging mode

    ND(remote address pool) NA Remote NA

Address Protection

When one or more addresses in an IPv6 address pool become unavailable, you can take any of the following methods:

  • Locking the IPv6 address pool

    After an IPv6 address pool is locked, no address in this pool can be allocated. This method applies to scenarios where the IPv6 address pool fails to be deleted because it is in use. Locking the IPv6 address pool prevents the address pool from allocating addresses to new users. After all users of the address pool go offline, addresses in the IPv6 address pool will be released. You can then delete the IPv6 address pool.

  • Excluding specific IPv6 addresses

    In complicated networking scenarios, you can use this method to prevent some IP addresses from being allocated.

  • Setting conflict flags

    If some IP addresses in the IPv6 address pool conflict with device IP addresses, use this method to attach conflict flags to the IP addresses in the address pool. After the conflicts disappear, delete the conflict flags.

  • Address withdrawal

    If you want to withdraw the addresses of some offline users, use this method.

Address Lease

The leases of user addresses are under management. When the lease of a user's address is close to expiration, the protocol automatically renews the address lease. The renewal will be successful so long as the requested IP address is available.

Address Reservation

Address reservation means dynamically allocate IPv6 addresses.
  • MAC reservation: The IPv6 addresses are dynamically allocated through DHCPV6 based on MAC addresses. If a user's MAC address and the allocated IP address are recorded during the first login, the user can still use the originally allocated IP address when he goes online for the second time.
  • MAC- and lease-based reservation: An address is dynamically allocated to a client. After the client goes offline, the binding relationship between this address and the client retains for a lease. The address is released only after the lease expires. During this lease, the address is exclusive to the client.

  • DUID reservation

  • DUID- and lease-based reservation

Address Overlapping

The IP addresses of address pools in different VPN instances can overlap each other.

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Updated: 2019-01-02

Document ID: EDOC1100058415

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