Huawei Quidway S3500 Series User Manual

Operation Manual - System Management
Quidway S3500 Series Ethernet Switches Chapter 7 NTP Configuration
Huawei Technologies Proprietary
7-3
z The delay for a round trip of an NTP packet traveling between the Switch A and B:
Delay= (T
4
-T
1
) - (T
3
-T
2
).
z Offset of Ethernet Switch A clock relative to Ethernet Switch B clock: offset=
( (T
2
-T
1
) + (T
4
-T
3
) ) /2.
In this way, Ethernet Switch A uses the above information to set the local clock and
synchronize it with the clock on Ethernet Switch B.
The operating principle of NTP is briefly introduced above. For details, refer to
RFC1305.
7.2 NTP Configuration
NTP is used for time synchronization throughout a network. NTP configuration tasks
include:
z Configure NTP operating mode
z Configure NTP ID authentication
z Set NTP authentication key
z Set the specified key to be reliable
z Set a local interface for transmitting NTP packets
z Set an external reference clock or the local clock as the master NTP clock
z Enable/Disable an interface to receive NTP packets
z Set control authority to access the local Ethernet Switch service.
z Set maximum local sessions
7.2.1 Configure NTP Operating Mode
You can set the NTP operating mode of an Ethernet Switch according to its location in
the network and the network structure. For example, you can set a remote server as the
time server of the local equipment. In this case the local Ethernet Switch works as an
NTP client. If you set a remote server as a peer of the local Ethernet Switch, the local
equipment operates in symmetric active mode. If you configure an interface on the local
Ethernet Switch to transmit NTP broadcast packets, the local Ethernet Switch will
operates in broadcast mode. If you configure an interface on the local Ethernet Switch
to receive NTP broadcast packets, the local Ethernet Switch will operates in broadcast
client mode. If you configure an interface on the local Ethernet Switch to transmit NTP
multicast packets, the local Ethernet Switch will operates in multicast mode. Or you
may also configure an interface on the local Ethernet Switch to receive NTP multicast
packets, the local Ethernet Switch will operates in multicast client mode.
z Configure NTP server mode
z Configure NTP peer mode
z Configure NTP broadcast server mode
z Configure NTP broadcast client mode
z Configure NTP multicast server mode

Huawei Quidway S3500 Series Specifications

General

Brand	Huawei
Model	Quidway S3500 Series
Category	Network Router
Language	English