Chapter 38 Configuring Dns; Understanding How Dns Works - Cisco WS-C2948G-GE-TX 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 that are used in this chapter, refer to the
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Command
Reference.
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
that is specified is the primary server 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.
Catalyst 4500 Series, Catalyst 2948G, Catalyst 2948G-GE-TX, and Catalyst 2980G Switches Software Configuration Guide—Release 8.2GLX
78-15908-01
Understanding How DNS Works, page 38-1
Default DNS Configuration, page 38-2
Configuring DNS on the Switch, page 38-2
C H A P T E R
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