Monitoring Ntp - Juniper SYSTEM BASICS - CONFIGURATION GUIDE V 11.1.X Configuration Manual

Monitoring NTP

After you configure the system as an NTP client, you can use show commands to
view information about the NTP servers you assigned and the status of NTP on the
interface.
NOTE: For about 30 minutes after you configure the system as an NTP client, the
data varies rapidly, and then starts to stabilize. Wait at least 1 hour before using the
data to make decisions about NTP servers.
Many of the fields in the displays of these show commands take their values from
the NTP messages. The NTP client uses this data to compare the performance of its
NTP servers and to choose a master.
show ntp associations
Use to view the information about the NTP servers you assigned.
Field descriptions
* (Master) System is synchronizing to this server
# (Master - unsynchronized) System has chosen this server as master, but
the master has not yet synchronized to UTC
+ (Selected) System will consider this server when it chooses the master
- (Candidate) System may consider this server when it chooses the master
x (Unusable) Server does not meet the initial criteria for master
p (Preferred) Server that you specified as the preferred server
~ (Configured) Server is a configured server; no tilde indicates a broadcast
server
Peer Address IP address of server
Stratum Number of hops between the server and the accurate time source
Poll Time between NTP requests from system to server
Reachable 8-bit number that shows whether or not the NTP server
responded to the last eight requests from the system; one indicates a
response, zero indicates no response. For example, 11111111 indicates that
the NTP server responded to the last eight requests. If the system reaches
one server less often than it does other servers, that server is not a good
choice for the master.
Precision Length of the clock tick (interrupt interval) of server's clock
Delay Round-trip delay, with the lowest dispersion value in the sample
buffer, between the system and the server
Chapter 10: Configuring the System Clock
Monitoring NTP
533