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Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide
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Chapter 8 Administering the Switch
Configuring a System Name and Prompt
Default DNS Configuration
Table 8-2 shows the default DNS configuration.
Setting Up DNS
Beginning in privileged EXEC mode, follow these steps to set up your switch to use the DNS:
If you use the switch IP address as its hostname, the IP address is used and no DNS query occurs. If you
configure a hostname that contains no periods (.), a period followed by the default domain name is
appended to the hostname before the DNS query is made to map the name to an IP address. The default
Table 8-2 Default DNS Configuration
Feature Default Setting
DNS enable state Enabled.
DNS default domain name None configured.
DNS servers No name server addresses are configured.
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip domain-name name Define a default domain name that the software uses to complete unqualified
host names (names without a dotted-decimal domain name).
Do not include the initial period that separates an unqualified name from the
domain name.
At boot time, no domain name is configured; however, if the switch
configuration comes from a BOOTP or DHCP server, then the default domain
name might be set by the BOOTP or DHCP server (if the servers were
configured with this information).
Step 3
ip name-server server-address1
[server-address2 ...
server-address6]
Specify the address of one or more name servers to use for name and address
resolution.
You can specify up to six name servers. Separate each server address with a
space. The first server specified is the primary server. The switch sends DNS
queries to the primary server first. If that query fails, the backup servers are
queried.
Step 4
ip domain-lookup (Optional) Enable DNS-based host name-to-address translation on your switch.
This feature is enabled by default.
If your network devices require connectivity with devices in networks for which
you do not control name assignment, you can dynamically assign device names
that uniquely identify your devices by using the global Internet naming scheme
(DNS).
Step 5
end Return to privileged EXEC mode.
Step 6
show running-config Verify your entries.
Step 7
copy running-config
startup-config
(Optional) Save your entries in the configuration file.
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