Administrator Guide

ref CD7E14FD.43F7CED9 (16:29:49.265 UTC Wed Apr 1 2009)
org CD7F5368.D0535000 (15:8:24.813 UTC Thu Apr 2 2009)
rec CD7F5368.D0000000 (15:8:24.812 UTC Thu Apr 2 2009)
xmt CD7F5368.D0000000 (15:8:24.812 UTC Thu Apr 2 2009)
inp CD7F5368.D1974000 (15:8:24.818 UTC Thu Apr 2 2009)
rtdel-root delay
rtdsp - round trip dispersion
refid - reference id
org -
rec - (last?) receive timestamp
xmt - transmit timestamp
mode - 3 client, 4 server
stratum - 1 primary reference clock, 2 secondary reference clock (via NTP)
version - NTP version 3
leap -
NOTE:
• Leap Indicator (sys.leap, peer.leap, pkt.leap) — This is a two-bit code warning of an impending leap second to be
inserted in the NTP time scale. The bits are set before 23:59 on the day of insertion and reset after 00:00 on the following day. This
causes the number of seconds (rollover interval) in the day of insertion to be increased or decreased by one. In the case of primary
servers, the bits are set by operator intervention, while in the case of secondary servers, the bits are set by the protocol. The two
bits, bit 0, and bit 1, respectively, are coded as follows:
• Poll Interval — integer indicating the minimum interval between transmitted messages, in seconds as a power of two. For
instance, a value of six indicates a minimum interval of 64 seconds.
• Precision — integer indicating the precision of the various clocks, in seconds to the nearest power of two. The value must be
rounded to the next larger power of two; for instance, a 50 Hz (20 ms) or 60 Hz (16.67ms) power-frequency clock is assigned the
value -5 (31.25 ms), while a 1000 Hz (1 ms) crystal-controlled clock is assigned the value -9 (1.95 ms).
• Root Delay (sys.rootdelay, peer.rootdelay, pkt.rootdelay) — a signed xed-point number indicating the total
round-trip delay to the primary reference source at the root of the synchronization subnet, in seconds. This variable can take on
both positive and negative values, depending on clock precision and skew.
• Root Dispersion (sys.rootdispersion, peer.rootdispersion, pkt.rootdispersion) — a signed xed-point
number indicating the maximum error relative to the primary reference source at the root of the synchronization subnet, in
seconds. Only positive values greater than zero are possible.
• Reference Clock Identier (sys.refid, peer.refid, pkt.refid) — This is a 32-bit code identifying the particular
reference clock. In the case of stratum 0 (unspecied) or stratum 1 (primary reference source), this is a four-octet, left-justied,
zero-padded ASCII string, for example: in the case of stratum 2 and greater (secondary reference) this is the four-octet internet
address of the peer selected for synchronization.
• Reference Timestamp (sys.reftime, peer.reftime, pkt.reftime) — This is the local time, in timestamp format, when
the local clock was last updated. If the local clock has never been synchronized, the value is zero.
• Originate Timestamp: The departure time on the server of its last NTP message. If the server becomes unreachable, the
value is set to zero.
• Receive Timestamp — the arrival time on the client of the last NTP message from the server. If the server becomes unreachable,
the value is set to zero.
• Transmit Timestamp — the departure time on the server of the current NTP message from the sender.
• Filter dispersion — the error in calculating the minimum delay from a set of sample data from a peer.
To view the NTP conguration, use the show running-config ntp command in EXEC privilege mode. The following example shows
an encrypted authentication key (in bold). All keys are encrypted.
Dell#show running ntp
!
ntp authenticate
ntp authentication-
key 345 md5 5A60910F3D211F02
ntp server 11.1.1.1 version 3
ntp trusted-key 345
Dell#
System Time and Date
947