run ip dad

run ip dad [{vlan} vlan_name | {{vr} vr_name} ip_address]


Runs the DAD check on the specified IP interface for which the DAD feature is enabled.

Syntax Description

vlan_name Specifies a VLAN (Virtual LAN) on which to run the test.
vr_name Specifies a VR on which to run the test.
ip_address Specifies an IP address for which to run the test.


If you do not specify a VR or VRF, the command applies to the current VR context.

Usage Guidelines

To run the check, you must specify a VLAN name or a specific IP address. To support the check, the DAD feature must be enabled on the parent VR for the specified VLAN or IP interface.

This command is ignored for the following conditions:
  • The specified IP address is in tentative state.
  • DAD is configured to be off.
  • The host VLAN is disabled.
  • Loopback mode is enabled on the host VLAN.
  • DAD is already running due to interface initialization or a previous issue of this command.
  • The host VLAN belongs to virtual router VR-Mgmt.

If a duplicate address is detected during the check, the event is logged and the address remains valid if it was already valid. A valid address is an address that previously passed a DAD check (no duplicate address detected) and displays the U flag (Interface up) when the show ip dad command is entered. In this situation, the show ip dad command displays the D (duplicate address detected), E (Interface enabled), and U flags.

If the address was not already valid, the event is logged, the duplicate address transitions to duplicate address detected state, and the duplicate address displays the D flag when the show ip dad command is entered. If no duplicate IP address is detected, the specified IP interface transitions to or remains in the Interface up (U flag) state.


The following example runs the DAD check on the IP interfaces in VLAN "vlan1":

run ip dad vlan1


This command was first available in ExtremeXOS 12.6.

Platform Availability

This command is available on the Summit X450-G2, X460-G2, X670-G2, X770, and ExtremeSwitching X440-G2, X620, X690, X870 series switches.