A binding already exists for X.X.X.X ---- Help

[allaytani2]

Hi,

I need some help please, I have core switch 4507 it is configured to support DHCP server for the users and Printers.

I'm using manay DHCP pools, I have some pools only providing single IP address for some networking devices like printers.

below is the configuration for one printer :

ip dhcp pool MyCompany_Konica_Minolta_4

host 10.0.88.166 255.255.255.0

client-identifier 0100.206b.8801.99

dns-server 192.168.3.9 192.168.2.59

The question is after we replace the network card for the printer, i tried to change the settings for the "client-identifier 0100.206b.8801.99"

to replace the old MAC address by the new one. after I remove the old command and try to add it with new settings i'm getting the below error:

A binding already exists for 10.0.88.166

I checked the ARP list and the binding list but i didn't find anything related to that IP ?

Please I need some help to change it to be dedicated to that printer?

Regards

[Bilal Nawaz]

if you do a show ip dhcp binding 10.0.88.166 do you see this address? Has it been given out by DHCP.

If so please do:

clear ip dhcp binding 10.0.88.166

Remember - this is an IP that is given out by dhcp so some client device might have this address assigned already...

If you cant 'ping' it then most likely its not connected in which case its reasonable for you to do this.

Hope this helps

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

[allaytani2]

HI Bilal,

Thank you for reply.

The IP address not taken by any device, 

- show command result 0.

- ping command result request timeout.

I'm still getiing that error A binding already exists for 10.0.88.166

I will try to shut down the VLAN interface after working time and try it again.

I will inform you later.

Regards

[Bilal Nawaz · Accepted solution]

Okay thats strange...

Could you do a show run | inc 10.0.88.166 please?

If anything please try deleting the whole DHCP reservation and re-adding like this:

no ip dhcp pool MyCompany_Konica_Minolta_4

!

ip dhcp pool MyCompany_Konica_Minolta_4

  host 10.0.88.166 255.255.255.0

  client-identifier 0100.206b.8801.99

  dns-server 192.168.3.9 192.168.2.59

Hope this helps.

Please rate useful posts and remember to mark any solved questions as answered. Thank you.

[allaytani2]

Dear Bilal,

Thanks alot, it works with me after deleting and reconfigured.

Regards