Huawei AR150 Series Configuration Manual page 111

Huawei AR150&200&1200&2200&3200 Series Enterprise
Routers
Configuration Guide - Device Management
NOTE
Procedure
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Issue 05 (2014-01-16)
If a source address from which NTP packets are sent is specified on the server, the address must be the
same as the server IP address configured on the client. Otherwise, the client cannot process the NTP packets
sent by the server, resulting in failed clock synchronization.
Unicast Client/Server Mode
NOTE
In the unicast client/server mode, you need to configure only the client. The server needs to be
configured with only an NTP primary clock.
Only after the clock on the server is synchronized, the server can function as a clock server to which
other devices can be synchronized. When the clock stratum of the server is greater than or equal to
the clock stratum of the client, the client is not synchronized to the server.
You can run the ntp-service unicast-server command repeatedly to configure multiple
servers. The client selects the optimal clock source by selecting a preferred clock.
Configure the unicast client.
1. Run:
system-view
The system view is displayed.
2. Run:
–
ntp-service unicast-server ip-address [ version number | authentication-
keyid key-id |
interface interface-type interface-number | vpn-instance vpn-instance-
name | preference ]
An NTP server with a specified IPv4 address is configured.
–
ntp-service unicast-server ipv6 ipv6-address [ authentication-keyid
key-id | maxpoll max-number | minpoll min-number | source-interface
interface-type interface-number | vpn-instance vpn-instance-name |
*
preference ]
An NTP server with a specified IPv6 address is configured.
The value of ip-address or ipv6-address is the IP address of the NTP server.
It can be the IP address of a host instead of being a broadcast address, a multicast
address, or the IP address of a reference clock.
To specify the parameter authentication-keyid, see
NTP Authentication.
Symmetric Peer Mode
NOTE
Only the IP address of the symmetric passive peer needs to be specified on the symmetric active peer
by a user, and both symmetric peers use this IP address to exchange NTP packets.
One of the symmetric active peer and the symmetric passive peer must be in the synchronized state.
Otherwise, they cannot be synchronized.
You can run the ntp-service unicast-peer command repeatedly to configure multiple
symmetric passive peers. When a symmetric active peer has multiple symmetric passive peers
configured, the synchronization direction follows the principle that a symmetric peer of a larger
stratum is synchronized with a symmetric peer of a smaller stratum.
Configure the symmetric active peer.
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maxpoll max-number | minpoll min-number | source-
*
5 NTP Configuration
5.5.4.5 Configuring
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