Cisco NCS 5000 Series User Manual

•
Serve restrictions are applied to IP addresses that pass the criteria of access list named serve-acl.
•
Serve-only restrictions are applied to IP addresses that pass the criteria of the access list named
serve-only-acl.
•
Query-only restrictions are applied to IP addresses that pass the criteria of the access list named
query-only-acl.
ntp
peer 10.1.1.1
peer 10.1.1.1
peer 10.2.2.2
peer 10.3.3.3
peer 10.4.4.4
peer 10.5.5.5
peer 10.6.6.6
peer 10.7.7.7
peer 10.8.8.8
access-group peer peer-acl
access-group serve serve-acl
access-group serve-only serve-only-acl
access-group query-only query-only-acl
exit
ipv4 access-list peer-acl
10 permit ip host 10.1.1.1 any
20 permit ip host 10.8.8.8 any
exit
ipv4 access-list serve-acl
10 permit ip host 10.4.4.4 any
20 permit ip host 10.5.5.5 any
exit
ipv4 access-list query-only-acl
10 permit ip host 10.2.2.2 any
20 permit ip host 10.3.3.3 any
exit
ipv4 access-list serve-only-acl
10 permit ip host 10.6.6.6 any
20 permit ip host 10.7.7.7 any
exit
Configuring NTP Authentication: Example
The following example shows an NTP authentication configuration. In this example, the following is configured:
•
NTP authentication is enabled.
•
Two authentication keys are configured (key 2 and key 3).
•
The router is configured to allow its software clock to be synchronized with the clock of the peer (or
vice versa) at IP address 10.3.32.154 using authentication key 2.
•
The router is configured to allow its software clock to be synchronized with the clock by the device at
IP address 10.32.154.145 using authentication key 3.
•
The router is configured to synchronize only to systems providing authentication key 3 in their NTP
packets.
ntp
authenticate
authentication-key 2 md5 encrypted 06120A2D40031D1008124
authentication-key 3 md5 encrypted 1311121E074110232621
trusted-key 3
server 10.3.32.154 key 3
System Management Configuration Guide for Cisco NCS 5000 Series Routers, IOS XR Release 6.2.x
165
Implementing NTP
Configuration Examples for Implementing NTP

Cisco NCS 5000 Series Specifications

General

Brand	Cisco
Model	NCS 5000 Series
Category	Network Router
Language	English