Cisco Catalyst 2360, Руководство по настройке программного обеспечения

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5-7
Catalyst 2360 Switch Software Configuration Guide
OL-19808-01
Chapter 5 Administering the Switch
Managing the System Time and Date
Configuring NTP Access Restrictions
This section describes how to control NTP access.
Creating an Access Group and Assigning a Basic IP Access List
Beginning in privileged EXEC mode, follow these steps to control access to NTP services by using
access lists:
The access group keywords are scanned in this order, from least restrictive to most restrictive:
1.
peer —Allows time requests and NTP control queries and allows the switch to synchronize itself to
a device whose address passes the access list criteria.
2.
serve —Allows time requests and NTP control queries, but does not allow the switch to synchronize
itself to a device whose address passes the access list criteria.
Command Purpose
Step 1 configure terminal Enter global configuration mode.
Step 2 ntp access-group { query-only |
serve-onl y | serve | peer }
access-list-number
Create an access group, and apply a basic IP access list.
The keywords have these meanings:
•
query-only —Allows only NTP control queries.
• serve-only —Allows only time requests.
•
serve —Allows time requests and NTP control queries, but does not
allow the switch to synchronize to the remote device.
• peer —Allows time requests and NTP control queries and allows the
switch to synchronize to the remote device.
For access-list-number , enter a standard IP access list number from 1
to 99.
Step 3
access-list access-list-number permit
source [ source-wildcard ]
Create the access list.
•
For access-list-number , enter the number specified in Step 2.
• Enter the permit keyword to permit access if the conditions are
matched.
•
For source , enter the IP address of the device that is permitted access
to the switch.
•
(Optional) For source-wildcard , enter the wildcard bits to be applied
to the source.
Note
When creating an access list, remember that, by default, the end
of the access list contains an implicit deny statement for
everything if it did not find a match before reaching the end.
Step 4 end Return to privileged EXEC mode.
Step 5 show running-config Verify your entries.
Step 6
copy running-config startup-config (Optional) Save your entries in the configuration file.