Cisco 2950G 24 Software Configuration Guide - Page 107
Obtaining Configuration Files, Relay Device Used in Autoconfiguration
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Chapter 4 Assigning the Switch IP Address and Default Gateway Figure 4-2 Relay Device Used in Autoconfiguration Switch (DHCP client) Cisco router (Relay) 10.0.0.1 10.0.0.2 20.0.0.1 Assigning Switch Information 20.0.0.2 20.0.0.3 20.0.0.4 49068 DHCP server TFTP server DNS server Obtaining Configuration Files Depending on the availability of the IP address and the configuration filename in the DHCP reserved lease, the switch obtains its configuration information in these ways: • The IP address and the configuration filename is reserved for the switch and provided in the DHCP reply (one-file read method). The switch receives its IP address, subnet mask, TFTP server address, and the configuration filename from the DHCP server. The switch sends a unicast message to the TFTP server to retrieve the named configuration file from the base directory of the server, and upon receipt, completes its boot-up process. • The IP address and the configuration filename is reserved for the switch, but the TFTP server address is not provided in the DHCP reply (one-file read method). The switch receives its IP address, subnet mask, and the configuration filename from the DHCP server. The switch sends a broadcast message to a TFTP server to retrieve the named configuration file from the base directory of the server, and upon receipt, completes its boot-up process. • Only the IP address is reserved for the switch and provided in the DHCP reply. The configuration filename is not provided (two-file read method). The switch receives its IP address, subnet mask, and the TFTP server address from the DHCP server. The switch sends a unicast message to the TFTP server to retrieve the network-confg or cisconet.cfg default configuration file. (If the network-confg file cannot be read, the switch reads the cisconet.cfg file.) The default configuration file contains the host names-to-IP-address mapping for the switch. The switch fills its host table with the information in the file and obtains its host name. If the host name is not found in the file, the switch uses the host name in the DHCP reply. If the host name is not specified in the DHCP reply, the switch uses the default Switch as its host name. After obtaining its host name from the default configuration file or the DHCP reply, the switch reads the configuration file that has the same name as its host name (hostname-confg or hostname.cfg, depending on whether network-confg or cisconet.cfg was read earlier) from the TFTP server. If the cisconet.cfg file is read, the filename of the host is truncated to eight characters. If the switch cannot read the network-confg, cisconet.cfg, or the hostname file, it reads the router-confg file. If the switch cannot read the router-confg file, it reads the ciscortr.cfg file. 78-14982-01 Catalyst 2950 Desktop Switch Software Configuration Guide 4-7