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Understanding EZ Touchless Provisioning on EX Series Switches

EZ Touchless Provisioning allows you to provision new Juniper Networks EX Series Ethernet Switches in your network automatically, without manual intervention. When you physically connect a switch to the network and boot it with a default configuration, it attempts to upgrade software automatically and autoinstall a configuration file from the network.

The switch uses information that you configure on a Dynamic Host Configuration Protocol (DHCP) server to provide to determine whether to perform these actions and to locate the necessary software image and configuration files on the network. If you do not configure the DHCP server to provide this information, the switch boots with the preinstalled software and default configuration.

You may upgrade or downgrade the software version. If you downgrade, consider the following points:

• If you downgrade to a software version earlier than Juniper Networks Junos operating system (Junos OS) Release 12.2, in which EZ Touchless Provisioning is not supported, the configuration file autoinstall phase of the EZ Touchless Provisioning process will not happen.
• To downgrade to a software version that does not support resilient dual-root partitions (release 10.4R2 or earlier), you must perform some manual work on the switch. For more information, see Understanding Resilient Dual-Root Partitions on Switches.

1. The switch sends a DHCP request to the network.

   If the DHCP server does not respond within 1 minute, the switch will send nine more DHCP requests, one per minute. If the DHCP server does not respond after the tenth request, the switch boots with the preinstalled software and the default configuration, and the EZ Touchless Provisioning process ends.

2. If the DHCP server provides DHCP option 150 (the IP address of a Trivial File Transfer Protocol (TFTP) server), the switch continues with the next step.

   If the DHCP server does not provide DHCP option 150, the switch boots with the preinstalled software image and the default configuration, and the EZ Touchless Provisioning process ends.

3. If the DHCP server provides DHCP option 43, suboption 00 (the name of the software image file on the TFTP server to install), the switch compares the version of the provided software image to the version of the software installed on the switch.
   • If the software versions are different, the switch downloads the software image from the TFTP server, installs it, and reboots using the default configuration. It then continues to the next step.
   • If the software versions are the same, the switch does not upgrade the software, and it then continues to the next step.
4. If the DHCP server provides DHCP option 43, suboption 01 (the name of the configuration file on the TFTP server to install), the switch accesses the TFTP server and installs and commits the specified configuration file.

   If the DHCP server does not provide DHCP option 43, suboption 01, the switch loads the default configuration.