Cisco Catalyst 2960 Series, Руководство по настройке

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• Improved security compared to NTPv3. The NTPv4 protocol provides a security framework based on
public key cryptography and standard X509 certificates.
• Automatic calculation of the time-distribution hierarchy for a network. Using specific multicast groups,
NTPv4 automatically configures the hierarchy of the servers to achieve the best time accuracy for the
lowest bandwidth cost. This feature leverages site-local IPv6 multicast addresses.
For details about configuring NTPv4, see the
Implementing NTPv4 in IPv6
chapter of the
Cisco IOS IPv6
Configuration Guide, Release 12.4T .
System Name and Prompt
You configure the system name on the Switch to identify it. By default, the system name and prompt are
Switch.
If you have not configured a system prompt, the first 20 characters of the system name are used as the system
prompt. A greater-than symbol [>] is appended. The prompt is updated whenever the system name changes.
For complete syntax and usage information for the commands used in this section, see the Cisco IOS
Configuration Fundamentals Command Reference , Release 12.4 and the Cisco IOS IP Command Reference ,
Volume 2 of 3: Routing Protocols , Release 12.4 .
Stack System Name and Prompt
If you are accessing a stack member through the active switchstack master, you must use the session
stack-member-number privileged EXEC command. The stack member number range is from 1 through 8.
When you use this command, the stack member number is appended to the system prompt. For example,
Switch-2# is the prompt in privileged EXEC mode for stack member 2, and the system prompt for the switch
stack is Switch.
Default System Name and Prompt Configuration
The default switch system name and prompt is Switch .
DNS
The DNS protocol controls the Domain Name System (DNS), a distributed database with which you can map
hostnames to IP addresses. When you configure DNS on your switch, you can substitute the hostname for the
IP address with all IP commands, such as
ping , telnet , connect , and related Telnet support operations.
IP defines a hierarchical naming scheme that allows a device to be identified by its location or domain. Domain
names are pieced together with periods (.) as the delimiting characters. For example, Cisco Systems is a
commercial organization that IP identifies by a
com domain name, so its domain name is cisco.com . A specific
device in this domain, for example, the File Transfer Protocol (FTP) system is identified as ftp.cisco.com .
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.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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Information About Administering the Switch