zero touch provisioning - tftp download during script fails

_|brt.drml|_ — Thu, 09 Sep 2021 05:49:16 GMT

Ok found the issue:

edited the post on this forum:

what was the issue:

You'll probably start reading the ZTP information on DevNet. The proposed setup on DevNet happens as follow: vlan 1 and on the switch you use the vlan 1 with the physical management interface g0/0.

The switch receives the script, runs it. Inside the script I download some scripts from the tftp server.

However in the real world VLAN 1 is disable and you like to use a Management VLAN. Moreover, a Trunk exists between your Router and Switch. Probably physical cabling is installed as intended to.

If I use the management interface between router and switch this is ok. If I use the intended trunk interface between router and switch, then the tftp download in the script failed over and over again.

The script was created with the DevNet example 🙂 Stupid me !

I encountered issues when the switch booted. It started, I ping the TFTP server and try to connect to the 'tftp' server, but fails for the initial download. The reason for this, example script, manipulated a bit for my wishes (error checking etc.) but, forgotthe default vrf Mgmt in the script. -> this was at the point still enabled on the script...

What is the physical setup:

The connection between switch and router ees is a trunk link.

Interface config on the router is configured as trunk ( EtherSwitch).

The new 9k switch boots up in standard 'dynamic auto' mode.

If I'm correct this means TRUNK interface.

What I understood of pnp and ztp 'workflow'.:

The device boots up, listens with pnp to a 'pnp enabled interface'. During first contact the new switch forms a trunk, receives the dhcp information on the enabled 'dhcp-vlan'. In this case the management vlan.

The scirpt is downloaded and is enabled in the guestshell.

However, the script did the tftp download in the vrf mgmt -> not a good idea . So be aware of this when you are playing with ZTP. 🙂 Took me half a day to find this stupid error!

Bootprocess I understood so far:

- configure the router with dhcp options

- configure the router with 'pnp' command to listen to pnp request on the correct vlan (default it is vlan 1)

- connect a cable between router and switch (can choose gi0/0 'management' or another interface - I preferred the permanent cabled interface')

- boot the switch - do not touch it -

- trunk is formed (when my ees-router interface is put in trunk)

- vlan management is automatically created

- download of the script

- guestshell enabled

- guestshell runs the script

- done.....

The ZTP boot process isn't that well described on the devnet.... However, google around for some Cisco Live! materials. There are some useful ones:

- explains how to setup the appropriate vlan pnp config.

- explains how to create a factory switch again.

Google search:

- drmlbrt/laughing-robot: (github.com)

- PowerPoint Presentation (ciscolive.com)

- DEVWKS-1301.pdf (ciscolive.com)

O and have a search on GitHub, some good coding examples.

If someone finds more detailed information please post this.

Thank you hope it can help

Re: zero touch provisioning - tftp download during script fails

Alexander Stevenson — Wed, 08 Sep 2021 20:17:47 GMT

Hello @_|brt.drml|_ ,

Thank you very much for updating the discussion with the solution. Can you please also mark it as solved, if that is possible?

Re: zero touch provisioning - tftp download during script fails

_|brt.drml|_ — Thu, 09 Sep 2021 05:30:56 GMT

nope, had to select yours 🙂

Re: zero touch provisioning - tftp download during script fails

Alexander Stevenson — Thu, 09 Sep 2021 14:49:48 GMT

Thanks. I'll take it!

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