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yoongseong
Beginner

Can DHCP server in different network for Cisco IOS-XE ZTP?

In Cisco document Programmability Configuration Guide, Cisco IOS XE Everest 16.6.x, it stated the following:

Spoiler
In Zero-Touch Provisioning, a DHCP server must be running on the same network as the new device that is being provisioned. Zero-Touch Provisioning is supported on both management ports and in-band ports.

Any reason why DHCP server must be in the same network? Can't we use DHCP relay or IP helper if we only maintain a centralised DHCP server, instead of having additional DHCP server in each and every network segment that we need to run ZTP?

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NtwkEngineer
Beginner

Either you'll need to have the DHCP server on the network where the devices will be ZTP, or use an appropriate DHCP forwarding service (e.g. ip helper-address on an SVI) in order to forward the BOOTP traffic to a DHCP server on a different network.  Basically, it's the same requirement as for any other host receiving DHCP on a network.

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Sergey Lisitsin
Collaborator

yoongseong,

 

According to this document https://www.cisco.com/c/en/us/td/docs/routers/asr920/configuration/guide/chassis/b_Chassis_Guide_xe-16-5-asr920/using-ztp.pdf

there is no requirement to have a local DHCP server in every network for which ZTP is required.

Hi Sergey, in Cisco IOS-XE Programmability Guide, it did state that "a DHCP server must be running on the same network as the new device that is being provisioned."

NtwkEngineer
Beginner

Either you'll need to have the DHCP server on the network where the devices will be ZTP, or use an appropriate DHCP forwarding service (e.g. ip helper-address on an SVI) in order to forward the BOOTP traffic to a DHCP server on a different network.  Basically, it's the same requirement as for any other host receiving DHCP on a network.

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