Specifications

ipv6 nd dad attempts
SecureStack C3 Configuration Guide 18-15
ipv6 nd dad attempts
Thiscommandconfiguresthenumberofduplicateaddressdetection(DAD)attemptsmadeonthe
interfacewhenconfiguringIPv6unicastaddresses.
Syntax
ipv6 nd dad attempts number
no ipv6 nd dad attempts
Parameters
Defaults
Duplicateaddressdetectionenabled,for1attempt.
Mode
Routerinterfaceconfiguration:C3(su)‐>router(configif(Vlan1))#
Usage
IPv6DuplicateAddressDetectionisdescribedinRFC2462.DuplicateAddressDetectionuses
NeighborSolicitationandNeighborAdvertisementmessagestoverifytheuniquenessofan
address.DuplicateAddressDetectionmustbeperformedonunicastaddressespriortoassigning
themtoaninterface.AnaddressremainsinatentativestatewhileDuplicate
AddressDetectionis
beingperformed.Ifatentativeaddressisfoundtobeaduplicate,anerrormessageisreturned
andtheaddressisnotassignedtotheinterface.
UsethiscommandtochangethenumberofNeighborSolicitationmessagesthatcanbesentfor
DuplicateAddressDetectionfromthedefault
valueof1.Thenoformofthecommandreturnsthe
valuetothedefaultof1.Avalueof0disablesDuplicateAddressDetectionontheinterface.
Theshowipv6interfacecommanddisplaysthecurrentDADattemptsetting.
Example
ThisexamplechangesthenumberofconsecutiveNeighborSolicitationmessagessentforDADto
3onthisinterface.
C3(su)->router(configif(Vlan 1))# ipv6 nd dad attempts 3
number SpecifiesthenumberofconsecutiveNeighborSolicitationmessage
transmittedontheinterface,whenDuplicateAddressDetection(DAD)
isperformedonaunicastIPv6addressassignedtotheinterface.
Thevaluecanrangefrom0to600.Avalueof0disablesDuplicate
AddressDetectionontheinterface.Avalueof
1,whichisthedefault,
specifiesasingletransmissionwithnofollow‐uptransmissions.