102 SyncServer 600 Series User’s Guide 098-00720-000 Revision D1 – February, 2018
Chapter 4
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Table 4-7. NTPd Association Configuration Parameters
Parameter Description
Role Server
Creates a persistent association between the SyncServer (client) and an NTP
node (server). The client synchronizes with the server if the client's clock
selection algorithm selects this server as the best clock. Typical server
associations include: the hardware clock, the factory default NTP servers, and
servers added by the user.
The user creates a Server association to designate an NTP node that has an
NTP Stratum better or equal to that of the SyncServer (client). Often, the NTP
server is another Stratum 1 server with a GPS reference that is outside the user's
administrative jurisdiction.
Peer
Creates a persistent symmetric-active association between the SyncServer
(peer1) with an NTP node (peer2). For the NTP node running in
symmetric-passive mode, there is nothing needs to be done on the NTP node.
However, the NTP node can be configured in symmetric active mode too. When
configured, the two nodes can synchronize with each other in a variety of failure
scenarios, such as loss of GPS and Internet connectivity.
The user configures NTP associations on two NTP nodes that point to the each
other. The two nodes are usually of equal stratum and have independent
references, such as two separate GPS installations or two separate network
paths to NTP servers on the Internet. In the event of a reference failure, the
peerscan synchronize to the node that has the best remaining reference.
Broadcast
Creates a broadcast server association. When configured with a broadcast
address (e.g., 192.168.61.255), the association broadcasts NTP messages from
the network interface with the matching IP address (e.g., 192.168.61.58).
Broadcast messages go out to all nodes on the subnet, and are usually blocked
by routers from reaching adjacent subnets. Consult with the network
administrator to select a correctly-scoped address and Time-to-Live (TTL) value.
Typical Usage: Broadcast associations to reduce network traffic with a large
number of NTP clients.
Address The IP address or DNS name of the NTP association.
Port With the default setting, the NTP daemon automatically detects and uses a valid
network port to communicate with configured NTP server(s). Depending on the IP
routing infrastructure, this is typically LAN1. The user can override this by
selecting a specific network port. If so, the address must be specified using an IP
address instead of a DNS name. The Port setting is only available for Server,
Peer, Broadcast, and Multicast associations.
(Factory Default = "Default")
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