IP Helper for PXE boot

[fakiee]

Hi,

We currently use IP Helper for our DHCP assignments and have option 66 and 67 set in the DHCP scope on the Windows server.  The current setup works fine for UEFI PXE boot on the IP scopes (switches) assigned.

I have added a new scope for a PXE VLAN (88 subnet) and instead of setting up options 66 and 67 I have left them out, instead adding IP Helper address for the PXE server:

192.168.4.2 (DHCP Server)

192.168..4.44 (Deployment server)

I cant get a device to work with PXE (brand new UEFI boot lenovo devices) The computer gets an IP when loggin into windows, but nothing happens when PXE booting. 

Here is ana an example config (removed the LAN 1-7, 9-44:

J9728A 
module 1 type j9728a
trunk 45-48 trk6 lacp

ip default-gateway 10.13.100.1
ip route 0.0.0.0 0.0.0.0 10.13.100.1
ip routing
snmp-server community "public" unrestricted
oobm
ip address dhcp-bootp
exit

router rip
redistribute connected
enable
exit

vlan 1
name "DEFAULT_VLAN"
no untagged 1-44,Trk6
ip address dhcp-bootp
exit

vlan 88
name "SCPXELAN"
untagged 8
ip address 10.13.88.1 255.255.255.0
ip helper-address 192.168.4.2
ip helper-address 192.168.4.44
exit

vlan 100
untagged Trk6
ip address 10.13.100.61 255.255.255.0
ip rip 10.13.100.61
exit

spanning-tree Trk6 priority 4
no tftp server
no autorun
no dhcp config-file-update
no dhcp image-file-update
device-profile name "default-ap-profile"
cos 0
exit
activate software-update disable
activate provision disable

[Rajendra_Jena · Accepted solution]

Hi,

I can see you have configured the swtich as DHCP relay agent.  So with the DHCP relay agent enabled, an interface forwards incoming DHCP requests to a DHCP server.  

Also I can see you have missed one command to enable  to enable the DHCP relay agent.  Need to configure below command to enable DHCP relay.

• system-view
• interface interface-type interface-number
• dhcp select relay

If you are still not getting while when PXE booting then need to do a wireshark packet capture to understand if the switch is getting request while PEX booting.