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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Configuring Link-local Addresses for Interfaces

Configuring Link-local Addresses for Interfaces


Link-local addresses are used in neighbor discovery or stateless autoconfiguration. An IPv6 link-local address is generated by either of the following methods:

  • Generated automatically: A device automatically generates a link-local address for an interface based on the link-local prefix (FE80::/10) and link layer address of the interface.
  • Configured manually: You can manually configure an IPv6 link-local address for an interface.
  • Each interface can be configured with only one link-local address. To prevent link-local address conflict, automatically generated link-local addresses are recommended.

  • Manually configured link-local addresses have a higher priority than automatically generated ones. Manually configured addresses can overwrite automatically generated ones, but automatically generated addresses cannot overwrite manually configured ones. If manually configured addresses are deleted, the automatically generated ones that were previously overwritten take effect again.


  1. Run system-view

    The system view is displayed.

  2. Run interface interface-type interface-number

    The specified interface view is displayed.

  3. On an Ethernet interface, run undo portswitch

    The interface is switched to Layer 3 mode.

    By default, an Ethernet interface works in Layer 2 mode.

    The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.


    If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

  4. Run ipv6 enable

    The IPv6 function is enabled on the interface.

    By default, the IPv6 function is disabled on an interface.

  5. Run either of the following commands to configure a link-local address for an interface:

    • Run ipv6 address ipv6-address link-local

      A link-local address is configured for an interface.

    • Run ipv6 address auto link-local

      A link-local address is automatically generated.

    You can configure multiple IPv6 addresses but only one link-local address for an interface.

  6. Run commit

    The configuration is committed.

Updated: 2019-04-18

Document ID: EDOC1100039535

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