DAD Overview

When enabled on a user VR or VR-Default, the DAD feature checks all IP addresses configured on the DAD-enabled VRs to determine if there are duplicate IP addresses on the networks connected to the switch. If a duplicate address is discovered, the switch does one of the following:

Marks the IP address as valid
Marks the IP address as duplicate and generates EMS events to advertise this

At the completion of the DAD check for each interface, the interface is marked valid or duplicate. A valid IP interface can be used by all switch processes for IP communications. There are no restrictions on a valid IP address. If no duplicate address is detected, the IP address is marked valid.

A duplicate IP address cannot be used for IP communications. If a duplicate IP address is detected, the marking depends on the action that initiated the test and can depend on a previous marking for the IP address. For some events, a duplicate IP address generates an EMS event, and for some other events, a duplicate IP address results in a disabled IP address and corresponding EMS events.

Published March 2020prev | next

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