OS10 Enterprise Edition User Guide Release 10.4.0E(R3)

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Duplicate address discovery

To determine if an IPv6 unicast address is unique before assigning it to an interface, an OS10 switch sends a neighbor solicitation message. If the process of duplicate address discovery (DAD) detects a duplicate address in the network, the address is not configured on the interface. DAD is enabled by default.

By default, IPv6 is not disabled when a duplicate address is detected. Only the duplicate address is not applied. Other IPv6 addresses are still active on the interface.

To disable IPv6 on an interface when a duplicate link-local address is detected, use the ipv6 nd dad disable-ipv6-on-failure command. To re-enable IPv6 after you resolve a duplicate link-local address, enter no ipv6 enable, followed by ipv6 enable.

  • Disable or re-enable IPv6 duplicate address discovery in Interface mode.
    ipv6 nd dad {disable | enable}
  • Disable IPv6 on an interface if a duplicate link-local address is discovered in Interface mode.
    ipv6 nd dad disable-ipv6-on-dad-failure

Disable duplicate address discovery

OS10(config)# interface ethernet 1/1/1
                              OS10(conf-if-eth1/1/1)# ipv6 nd dad disable
                           

Disable IPv6 for duplicate link-local address

OS10(config)# interface ethernet 1/1/1
                              OS10(conf-if-eth1/1/1)# ipv6 nd dad disable-ipv6-on-dad-failure
                           

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