3-10
Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 3 Assigning the Switch IP Address and Default Gateway
Assigning Switch Information
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 3-3
shows a sample network for retrieving IP information by using DHCP-based
autoconfiguration.
Figure 3-3
DHCP-Based Autoconfiguration Network Example
Table 3-2
shows the configuration of the reserved leases on the DHCP server.
Switch 1
00e0.9f1e.2001
Cisco router
111394
Switch 2
00e0.9f1e.2002
Switch 3
00e0.9f1e.2003
DHCP server
DNS server
TFTP server
(tftpserver)
10.0.0.1
10.0.0.10
10.0.0.2
10.0.0.3
Switch 4
00e0.9f1e.2004
Table 3-2
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
Subnet mask
255.255.255.0
255.255.255.0
255.255.255.0
255.255.255.0
Router address
10.0.0.10
10.0.0.10
10.0.0.10
10.0.0.10
DNS server address
10.0.0.2
10.0.0.2
10.0.0.2
10.0.0.2
TFTP server name
tftpserver or
10.0.0.3
tftpserver or
10.0.0.3
tftpserver or
10.0.0.3
tftpserver or
10.0.0.3
Boot filename (configuration file)
(optional)
switcha-confg
switchb-confg
switchc-confg
switchd-confg
Hostname (optional)
switcha
switchb
switchc
switchd
