Cisco APIC Layer 3 Networking Configuration Guide, Release 6.2(x)

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Cisco APIC Layer 3 Networking Configuration Guide, Release 6.2(x)

Configure neighbor discovery duplicate address detection using the GUI

Updated: April 17, 2026

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This topic describes disabling neighbor discovery Duplicate Address Detection for a subnet using the GUI, including interface navigation, DAD parameter configuration, and verifying settings on the leaf switch.

Use the procedures in this section to disable the Neighbor Discovery Duplicate Address Detection process for a subnet.

Procedure

  1. Navigate to the appropriate page to access the DAD field for that interface. For example:

    1. Navigate to Tenants > Tenant > Networking > L3Outs > L3Out > Logical Node Profiles > node > Logical Interface Profiles , then select the interface that you want to configure.
    2. Click on Routed Sub-interfaces or SVI , then click on the Create (+) button to configure that interface.

  2. For this interface, make the following settings for the DAD entries:

    • For the primary address, set the value for the DAD entry to enabled .

    • For the shared secondary address, set the value for the DAD entry to disabled . Note that if the secondary address is not shared across border leaf switches, then you do not need to disable the DAD for that address.

    Example:

    For example, if you were configuring this setting for the SVI interface, you would:

    • Set the Side A IPv6 DAD to enabled .

    • Set the Side B IPv6 DAD to disabled .

    Example:

    As another example, if you were configuring this setting for the routed sub-interface interface, you would:

    • In the main Select Routed Sub-Interface page, set the value for IPv6 DAD for the routed sub-interface to enabled .

    • Click on the Create (+) button on the IPv4 Secondary/IPv6 Additional Addresses area to access the Create Secondary IP Address page, then set the value for IPv6 DAD to disabled . Then click on the OK button to apply the changes in this screen.

  3. Click on the Submit button to apply your changes.

  4. Enter the show ipv6 int command on the leaf switch to verify that the configuration was pushed out correctly to the leaf switch. For example: 

    
            swtb23-leaf5# 
            show ipv6 int vrf icmpv6:v1
            IPv6 Interface Status for VRF "icmpv6:v1"(9)
            vlan2, Interface status: protocol-up/link-up/admin-up, iod: 73
            if_mode: ext
            IPv6 address:
            2001:DB8:A::2/64 [VALID] [PREFERRED]
            2001:DB8:A::11/64 [VALID] [dad-disabled]
            IPv6 subnet:  2001:DB8:A::/64
            IPv6 link-local address: fe80::863d:c6ff:fe9f:eb8b/10 (Default) [VALID]