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SmartAX MA5616 Multi-service Access Module
Configuration Guide
to 3 (client mode) and 4 (server mode) with the server to estimate the network delay between
the client and the server. The client then enters the multicast client mode, continues to listen to
the incoming multicast packets, and synchronizes the local clock according to the incoming
multicast packets, as shown in
Figure 3-27 NTP multicast mode
Precaution
1.
2.
Procedure
l
Issue 04 (2011-10-30)
In the multicast mode, you need to configure both the NTP server and the NTP client.
The clock stratum of the synchronizing device must be higher than or equal to that of the
synchronized device. Otherwise, the clock synchronization fails.
Configure the NTP multicast 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.
b.
Run the ntp-service authentication-keyid command to set an NTP
authentication key.
c.
Run the ntp-service reliable authentication-keyid command to declare that the
key is reliable.
2.
Add a VLAN L3 interface.
a.
Run the vlan command to create a VLAN.
b.
Run the port vlan command to add an upstream port to the VLAN so that the
user packets carrying the VLAN tag are transmitted upstream through the
upstream port.
c.
In the global config mode, run the interface vlanif command to create a VLAN
interface, and then enter the VLAN interface mode to configure the L3 interface.
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Figure
3-27.
3 Basic Configuration
74
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