Cisco Systems 3750E manual Default DNS Configuration, Setting Up DNS, Ip domain-name name

Chapter 7 Administering the Switch

Configuring a System Name and Prompt

To keep track of domain names, IP has defined the concept of a domain name server, which holds a cache (or database) of names mapped to IP addresses. To map domain names to IP addresses, you must first identify the hostnames, specify the name server that is present on your network, and enable the DNS.

These sections contain this configuration information:

•Default DNS Configuration, page 7-16

•Setting Up DNS, page 7-16

•Displaying the DNS Configuration, page 7-17

Default DNS Configuration

Table 7-2shows the default DNS configuration.

Table 7-2	Default DNS Configuration
Feature		Default Setting
DNS enable state		Enabled.
DNS default domain name		None configured.
DNS servers		No name server addresses are configured.

Setting Up DNS

Beginning in privileged EXEC mode, follow these steps to set up your switch to use the DNS:

	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
			hostnames (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 Dynamic Host Configuration Protocol
			(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		Specify the address of one or more name servers to use for name and address
	[server-address2 ...		resolution.
	server-address6]		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 hostname-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).
		Catalyst 3750-E and 3560-E Switch Software Configuration Guide
7-16			OL-9775-02