KB.15.15

The no form of the command replaces the configured IP address with the null setting.

(Default: null)

Syntax

[ no ]ip dns domain-name domain-name-suffix

This optional DNS command configures the domain suffix that is automatically

appended to the host name entered with a DNS-compatible command. When the

domain suffix and the IP address for a DNS server that can access that domain are

both configured on the switch, you can execute a DNS-compatible command using

only the host name of the desired target. (For an example, see Figure 237

(page 445).) In either of the following two instances, you must manually provide the

domain identification by using a fully qualified DNS name with a DNS-compatible

command:

• If the DNS server IP address is configured on the switch, but the domain suffix

is not configured (null.)

• The domain suffix configured on the switch is not the domain in which the

target host exists.

The switch supports one domain suffix entry and three DNS server IP address entries.

(See sthe preceding command description.)

The no form of the command replaces the configured domain suffix with the null

setting. (Default: null)

Using DNS names with ping and traceroute

In the network illustrated in Figure 239 (page 447), the switch at 10.28.192.1 is configured to use

DNS names for DNS-compatible commands in the pubs.outdoors.com domain. The DNS server

has been configured to assign the host name docservr to the IP address used by the document

server (10.28.229.219.)

Figure 239 Example network domain

Configuring switch "A" with the domain name and the IP address of a DNS server for the domain

enables the switch to use host names assigned to IP addresses in the domain to perform ping and

traceroute actions on the devices in the domain. To summarize:

IdentityEntity

10.28.229.10DNS server IP address

pubs.outdoors.comDomain name (and domain suffix for hosts in the domain)

docservrHost name assigned to 10.28.229.219 by the DNS server

docservr.pubs.outdoors.comFully qualified domain name for the IP address used by the

document server (10.28.229.219)

DNS resolver 447