Obtaining Configuration Files - Cisco Catalyst 3750 Software Configuration Manual

Chapter 3 Assigning the Switch IP Address and Default Gateway
On interface 20.0.0.1
router(config-if)# ip helper-address 10.0.0.1
If the switch is acting as the relay device, configure the interface as a routed port. For more information,
Note
see the
page
Figure 3-2
DHCP 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:
•
•
•
78-15870-01
"Routed Ports" section on page 9-4
9-18.
Relay Device Used in Autoconfiguration
Switch
(DHCP client)
10.0.0.2
10.0.0.1
20.0.0.2 20.0.0.3
TFTP server
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.
and the "Configuring Layer 3 Interfaces" section on
Cisco router
(Relay)
20.0.0.1
20.0.0.4
DNS server
Catalyst 3750 Metro Switch Software Configuration Guide
Assigning Switch Information
3-7