Huawei SmartAX MA5616 Configuration Manual page 83

SmartAX MA5616 Multi-service Access Module
Configuration Guide
Prerequisites
Before configuring the NTP broadcast mode, make sure that the network interface and the routing
protocol of the MA5616 are configured so that the server and the client are reachable to each
other at the network layer.
Context
In the broadcast mode, the server periodically sends clock synchronization packets to the
broadcast address 255.255.255.255, with the Mode field set to 5 (indicating the broadcast mode).
The client snoops on the broadcast packets sent from the server. After receiving the first
broadcast packet, the client exchanges NTP packet whose interaction mode fields are set to 3
(on the client) and 4 (on the server) with the server to obtain the network delay between the
client and the server. The client then enters the broadcast client mode, continues to snoop on the
incoming broadcast packets, and synchronizes the local clock according to the incoming
broadcast packets, as shown in
Figure 3-26 NTP broadcast mode
Precaution
1.
2.
Procedure
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Issue 04 (2011-10-30)
In the broadcast mode, you need to configure both the NTP server and the NTP client.
The clock stratum of the synchronizing device must be smaller than or equal to that of the
synchronized device. Otherwise, the clock synchronization fails.
Configure the NTP broadcast client host.
1. (Optional) Configure NTP authentication.
In certain networks that have strict requirements on security, it is recommended that
you enable NTP authentication when running the NTP protocol. The configuration of
the server must be the same as that of the client.
a. Run the ntp-service authentication enable command to enable NTP
authentication.
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Figure 3-26.
3 Basic Configuration
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