show ip dad

show ip dad {[{{vr} vr_name {ip_address} | vr all | [ { vlan } vlan_name | vlan vlan_list ] {tentative | valid | duplicate} | {{vr} vr_name} ip_address]}

Description

Displays the configuration and run time status for the DAD feature on the specified IP interface.

Syntax Description

vr_name Specifies a VR for which to display the DAD information.
ip_address Specifies an IP address for which to display the DAD information.
vlan_name Specifies a VLAN (Virtual LAN) name for which to display the DAD information.
vlan_name Specifies a VLAN list for which to display the DAD information.
tentative Displays information for IP interfaces for which the status is up and the DAD check is incomplete.
valid Displays information for IP interfaces that the DAD check has declared valid.
duplicate Displays information for IP interfaces for which a duplicate IP address was detected.

Default

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

Usage Guidelines

The vr all option displays DAD information for all IP interfaces on the switch.

The DAD check takes very little time, so you might not see the T flag (tentative address) during normal operation.

A valid IP address displays the E (interface enabled) and U (interface up) flags, and switch processes can use the IP address. If a duplicate IP address is detected after an IP address is declared valid, the D flag (duplicate address detected) also appears.

An invalid IP address does not show the U flag and might not show the E flag. If a duplicate address was detected for the invalid address, the D flag appears.

The L flag indicates an IP address for a loopback VLAN. The DAD check does not run on loopback VLANs and always marks a loopback VLAN as valid.

Example

The following example output displays the DAD feature status for all IP interfaces in the current VR context:

IPv4 Duplicate Address Detection
DAD Status                 : On
Max Solicitation Attempts  : 1
Virtual Router         Interface              Flags    IP Address
Conflict MAC         Failures
--------------------------------------------------------------------------------
VR-Default             loop158                -ELU    81.70.100.35
00:00:00:00:00:00       0
VR-Default             exL-v188               -E-U    13.224.90.90
00:04:96:12:ae:60       1
Flags : (D) Duplicate address detected, (T) Tentative address,
(E) Interface enabled, (L) Loopback enabled, (U) Interface up

History

This command was first available in ExtremeXOS 12.6.

The vlan_list variable was added in ExtremeXOS 16.1.

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.