4-9
Cisco IE 3000 Switch Software Configuration Guide
OL-13018-03
Chapter 4 Assigning the Switch IP Address and Default Gateway
Assigning Switch Information
•
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 hostnames-to-IP-address mapping for the switch. The
switch fills its host table with the information in the file and obtains its hostname. If the hostname
is not found in the file, the switch uses the hostname in the DHCP reply. If the hostname is not
specified in the DHCP reply, the switch uses the default
Switch
as its hostname.
After obtaining its hostname from the default configuration file or the DHCP reply, the switch reads
the configuration file that has the same name as its hostname (
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.
Note
The switch broadcasts TFTP server requests if the TFTP server is not obtained from the DHCP replies,
if all attempts to read the configuration file through unicast transmissions fail, or if the TFTP server
name cannot be resolved to an IP address.
Example Configuration
Figure 4-3
shows a sample network for retrieving IP information by using DHCP-based autoconfiguration.
Figure 4-3
DHCP-Based Autoconfiguration Network Example
Table 4-2
shows the configuration of the reserved leases on the DHCP server.
S
witch 1
00e0.9f1e.2001
Ci
s
co router
111
3
94
S
witch 2
00e0.9f1e.2002
S
witch
3
00e0.9f1e.200
3
DHCP
s
erver
DN
S
s
erver
TFTP
s
erver
(tftp
s
erver)
10.0.0.1
10.0.0.10
10.0.0.2
10.0.0.
3
S
witch 4
00e0.9f1e.2004
Table 4-2
DHCP Server Configuration
Switch A
Switch B
Switch C
Switch D
Binding key (hardware address)
00e0.9f1e.2001
00e0.9f1e.2002
00e0.9f1e.2003
00e0.9f1e.2004
IP address
10.0.0.21
10.0.0.22
10.0.0.23
10.0.0.24
