Chapter 34 Configuring Dns; Understanding How Dns Works; Dns Default Configuration - Cisco WS-C4003 - Catalyst 4000 Chassis Switch Software Configuration Manual

Configuring DNS
This chapter describes how to configure the Domain Name System (DNS) on the Catalyst enterprise
LAN switches.
Note For complete syntax and usage information for the commands used in this chapter, refer to the Command
Reference—Catalyst 4000 Family, Catalyst 2948G, and Catalyst 2980G Switches.
This chapter consists of these sections:
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Understanding How DNS Works

DNS is a distributed database with which you can map host names to IP addresses through the DNS
protocol from a DNS server. When you configure DNS on the switch, you can substitute the host name
for the IP address with all IP commands, such as ping, telnet, upload, and download.
To use DNS, you must have a DNS name server on your network.
You can specify a primary DNS name server on the switch as well as two backup servers. The first server
specified is the primary unless you explicitly identify the primary server. The switch sends DNS queries
to the primary server first. If the query to the primary server fails, the backup servers are queried.

DNS Default Configuration

Table 34-1
Table 34-1 DNS Default Configuration
Feature
DNS enable state
DNS default domain name
DNS servers
78-12647-02
Understanding How DNS Works, page 34-1
DNS Default Configuration, page 34-1
Configuring DNS, page 34-2
shows the default DNS configuration.
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
C H A P T E R
Default Value
Disabled
Null
None specified
34
34-1