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Cisco Bug: CSCvi73732 - Placeholder for IPv6 DAD disable knob development

Last Modified

May 16, 2019

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases


Description (partial)

The shared secondary IPv6 address state on an external SVI might become "DUP" (duplicate state) and become unusable as a result of the Duplicate Address Detection (DAD) process on the address provisioning.  Use the "show ipv6 interface brief vrf <name>" command to check the state of the address on the external SVI to see if this issue is hit.

The shared secondary address is the global IPv6 subnet that is shared across multiple border leaf switches to provide border leaf switch redundancy to externally connected Layer 3 devices in the L3Out policy.

This issue might occur when the same IPv6 global subnet is configured on the external SVI that is using same encap-VLAN on two or more border leaf switches to provide border leaf switch redundancy.
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