The ZTP timeout is user-configurable with a default value of 30 minutes. See Options and option modification and Configuring the ZTP timeout in the provisioning file for more information. After each ZTP timeout, the node reboots and reattempts the ZTP process. If the ZTP timeout interval expires while the node is executing a DHCP offer or downloading files, the node does not reboot. The DHCP offer is executed until it succeeds or fails, at which point the node reboots. If the offer is successful, the node comes up in normal operation mode.
The DHCP timeout interval is 20 seconds. If a DHCP offer is not received within the DHCP timeout interval, the auto-provisioning process is reattempted using the next valid interface.