Client getting Automatic Private IP address

[susim]

Hi,

Clients are getting automatic privated ip address instead of ip address from the dhcp.sometime microsoft dhcp server shows bad ip address .

This started to happen when we replaced old switch with new 3850 switch where ip device tracking enabled .

How can i solve the issue .And how can i know the  reason behind the problem . This is not happening with all the clients . 

Please help 

Thank you 

[saif musa]

sbt,

What 3850 IOS version you are using ?? if you disabled ip device tracking feature inside you switch dose it solve this issue ??

[elite2010]

Hi,

 cannot disable this feature cause of dot1x authentication enabled 

Thank you 

[saif musa]

Hi,

you didnt told me about the version. anyway, if you run this command ip device tracking max ? under gig ethernet port level , what you got ?? (( the number of maximum devices from 1 - 10 OR from 0 - 65535 ))

[susim]

Hi,

sh ip device tracking all
Global IP Device Tracking for clients = Enabled
Global IP Device Tracking Probe Count = 3
Global IP Device Tracking Probe Interval = 30
Global IP Device Tracking Probe Delay Interval =

ip device tracking probe count 3
ip device tracking probe interval 30
ip device tracking probe use-svi
ip device tracking probe delay 0
ip device tracking trace-buffer
ip device tracking

Switch model :3850 

but it happens regardless of model 

Thank you 

[saif musa]

support sbt,

your issue belong to ARP " feature ". it seems to be a known issue (bug) and the current workarounds are the followings. Depending on the switch model and version, hopefully one of the options should work for you.

On switch interface,
Option1- enter "ip device tracking probe delay 10"
Option2- enter "ip device tracking max 0"
Option3- enter "nmsp attach suppress"

Let us know how its going with you...

Regards