Cisco Cisco IOS Software Release 12.4(4)T

To delete entries from the hostname-to-address cache, use the clear host command in EXEC mode.

clear host [vrf vrf-name] {all | hostname}

EXEC

The host name entries will not be removed from NVRAM, but will be cleared in running memory.

The following example shows how to clear all entries from the hostname-to-address cache:

Router> clear host all

The following example shows how to clear all entries from the hostname-to-address cache in the VPN 
name vpn1:

Router> clear host vrf vpn1

vrf vrf-name

(Optional) Virtual Private Network (VPN) routing and forwarding 
(VRF).

Removes all entries.

Particular hostname to remove.

10.0

This command was introduced.

12.4(4)T

The vrf keyword, vrf-name argument, and all keyword were added.

Defines a static host name-to-address mapping in the host cache.

Displays the default domain name, the style of name lookup service, a list of 
name server hosts, and the cached list of host names and addresses.