Cisco SR224T Administration Guide - Page 40

Managing System Files DHCP Auto Configuration 4 Triggering DHCP Auto Configuration The Auto Configuration process is triggered in the following cases: • After reboot when an IP address is allocated or renewed dynamically (using DHCP). • Upon an explicit DHCP renewal request and if the switch and the server are configured to do so. • Upon automatic renewal of the DHCP lease. Server Name/Address You can specify the IP address or the name of the TFTP server. This server is used if no server IP address was specified in the DHCP message. This DHCP message is the DHCP offer message coming from the DHCP server. Possible options are bootp options sname and siaddr and DHCP option 150 or option 66. This is an optional parameter. Backup Configuration File Name You can specify the backup configuration filename. This file is used if no filename was specified in the DHCP message. This is an optional parameter. Auto Configuration Process When the Auto Configuration process is triggered, the following sequence of events occurs: • The DHCP server is accessed to acquire the TFTP server IP address and configuration file name. These parameters are passed in the DHCP option parameters. • If an IP address was not supplied by the DHCP server, the backup server address is used (if configured by the user). • If the IP address was not supplied by the DHCP server and the backup TFTP server address parameter is empty then the Auto Configuration process is halted. NOTE In the previous two bullets, the IP address refers to the IP address or hostname of the TFTP server. Cisco Small Business 200 Series Smart Switch Administration Guide 41