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DHCP on Cisco Device

prabhu050446
Level 1
Level 1

Hello Everyone,

 

We migrated DHCP service from Windows to Cisco Device (works perfectly fine) but our PXE imaging is broken after migration.

 

I was trying trial and error and found below based on our requirements.

 

Requirements: All devices (Microsoft Surface and HP Z840 desktops) should be able to PXE imaged.

Set Up: our imaging server (SCCM server) is on VLAN 100 and imaging clients (HP Z840 and Surfaces) are on VLAN 200. Already have IP helper on the client VLAN.

Observations:

a) If I have only dhcp option 60 PXEClient configured under cisco DHCP scope then Surface PXE imaging works but not HP Z840.

b) If I have only Option 67 with filename smsboot\x64\wdsnbp.com then Z840 work but not Surface.

 

No other options like 66 or combination of 60, 66 and 67 works.

Cant go back to Windows because of valid internal reasons.'

 

The only difference I see between Windows DHCP service and Cisco DHCP serviced packets is that during the Windows DHCP offer I see Option 60 being sent by Router to Client, same is not done during Cisco DHCP Offer

 

Below are the scenarios that worked separately for device type, but I am looking for configuration that works for both/all of the device types.

 

Device

IP Helper

VLAN

Option 60

Option 66

Option 67

Opt 67 filename

success

Microsoft Surface

yes

2004

yes with PXEClient

no

no

no

YES

HP Z840

yes

2004

no

no

yes

smsboot\x64\wdsnbp.com

YES

 

Thank you in advance.

6 Replies 6

Deepak Kumar
VIP Alumni
VIP Alumni

Hi,

Try your DHCP pool configuration like this:

ip dhcp pool DATA_LAN
network 10.250.1.0 255.255.255.0
default-router 10.250.1.1
option 66 ip 10.250.1.2
option 67 ascii smsboot\x64\wdsnbp.com
dns-server 10.111.18.241 10.111.18.242
domain-name xx.local

Also noticed this bug (If option 67 is getting change): https://bst.cloudapps.cisco.com/bugsearch/bug/CSCsi10974/?rfs=iqvred

 

Regards,

Deepak Kumar

 

 

Regards,
Deepak Kumar,
Don't forget to vote and accept the solution if this comment will help you!

Thank you Deepak for the reply.

 

I dont think I am impacted with that bug.

 

Thank you

Dharmendra

Hi,
I am not saying the switch is infected with this bug. But it is shared for your information only.

Regards,
Deepak Kumar
Regards,
Deepak Kumar,
Don't forget to vote and accept the solution if this comment will help you!

Hello

ip dhcp pool xxx
option 66 ip x.x.x.x
option 67 ascli "file path"


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

Thanks a lot for the reply Paul. I tried all the combinations with Options 60, 66 and 67. If I h ave two options configured (like you suggested) then X840 works but not Surface.Below are the combinations that I already tried.

 

DeviceIP HelperVLANOption 60Option 66Option 67Opt 67 filenamesuccess
Z840yes200yesyesnoNANO
Z840yes200noyesnoNANO
Z840yes200noyesyessmsboot\x64\wdsmgfw.efi smsboot\x64\wdsnbp.com smsboot\x86\wdsmgfw.efi smsboot\x86\wdsnbp.comNO
Z840yes200nononoNANO
Z840yes200nonoyessmsboot\x64\wdsmgfw.efi smsboot\x64\wdsnbp.com smsboot\x86\wdsmgfw.efi smsboot\x86\wdsnbp.comNO
Z840yes200nonoyessmsboot\x64\pxeboot.comNO
Z840yes200yesyesnoNANO
Surfaceyes200nonoyessmsboot\x64\pxeboot.comNO
Surfaceyes200nonoyessmsboot\x64\wdsmgfw.efi smsboot\x64\wdsnbp.com smsboot\x86\wdsmgfw.efi smsboot\x86\wdsnbp.comNO
Surfaceyes200yes with PXEClientnononoYES
Z840yes200no no noNANO
Surfaceyes200no no noNANO
Z840yes200no no yessmsboot\x64\wdsnbp.comYES

 

as said earlier, the only difference I see between Windows DHCP service and Cisco DHCP serviced packets is that during the Windows DHCP offer I see Option 60 being sent by Router to Client, same is not done during Cisco DHCP Offer.

Thanks a lot.

some of the scenarios that I tried (your suggestion using opt 66 and 67) are not listed in the table as they did not work.
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