Web Inte
Web
Interfac
AVERTISSEMENT
AVER
TISSEMENT : : La La posit
Ell Elles es ne ne so sont nt pa pas s pré
vie-ou-mort).
vie-ou-mort).
STATUS - NTP
STATUS - NTP
NT
NTP
P
Daem
Da
This is pa page ge di disp spla lays ys th the e st stat atus us of of th the e NTP
Th
NTP Packet
NTP Packet
system peer : : Th
system peer
mo
mon n tha
that t is is mo
persi sion on and
per
and co conf nfid iden ence ce in inter
Syn
SyncSe
cServe
rver r Hard
system peer mode : : The
system peer mode
Depend
Dep
endin ing g th the e co conf nfig igura
Client: A A host
Client:
n
n
ab abil ilit ity y st stat ate e or or s s tr trat atum
st stati ation,
on, a a nno
Symmetric Active: A A host
Symmetric Active:
n
n
of of th the e re reac acha habi bili lity ty st stat ate e or or s s tr trat atum
ann
announc
ounces es its its will
Symmetric Passive: Thi
Symmetric Passive:
n
n
s s ag age e fr from
pe peer er is is re reac acha habl ble e an and d op oper erat atin ing g at at a a st stra ratu tum m le leve vel l le less ss th than an or or eq equa ual l to to th the e ho host st; ; ot othe her- r-
wis
wise, e, th the e as asso soci ciat atio ion n is is di diss ssol olve ved. d. Howe
le leas ast t on one e me
it its s wil
willi ling ngnes
A A host
host operatin
operating g in in clie
sa sage ge to to a a ho host st op opera
at at peri
periodi
odic c int interv
ports ts, , fi fill llin ing g in in the
por
need d ret
nee
retai ain n no no st stat ate e in info forma
int interva
ervals ls bet
between
In In the
the sy symm
mmetri
mode de is is in inte tend nded ed fo for r us use e by by ti time
mo
th the e sy sync nchro
hroni niza zati tion on su subn bnet et and
ba bas s is is. . In In th this is mo
ci ciati ation on wit
with h it its s st state
th the e st stat ate e st stor orag age e ca can n be be re reus used ed whe
hig
higher
her str stratum
Sym
Symme
metri tric c ac acti tive ve mo
(hig
(highes
hest t st stratum
Page e 16 16 ..........................................................................
Pag
rface e
position
ion et et l'altitu
prévu vues es po pour ur la la nav
navig igati ation on ou ou d'a
emon onSta
Status
tus
(o (on n pa page ge 12 129) 9). . Al Also so s s ee ee
The e IP IP ad addr dres ess s of of th the e c c lo lock ck so sour urce ce. . Th
most st li like kely ly to to pro
provi vide de th the e be best st ti timi ming ng in info forma
terva val. l. The
The sy syst stem
Hardware
ware Clo
Clock ck. . Als
Also o se see e
The rel relati ations
onshi hip p of of th the e Syn
urati tion on, , th the e mo
mode de ca can n be be: :
host operating
operating in in this
this mode
um of of it its s pe peer er. . By
nnounc
unces es it its s wil
willi lingn
ngnes ess s to to be be sy sync nchro
host operating
operating in in this
um of of it its s pe peer er. . By
willing
ingnes
ness s to to sy synch
nchroni
This s ty type pe of of as asso soci ciat atio ion n is is ord
om a a pe peer er op oper erat atin ing g in in th the e sy symm
mess ssag age e ha has s be been en s s en ent t in in re repl ply. y. By
ness s to to sy sync nchro
hroni nize ze and
and be be sy sync nchro
client nt mode
mode (a (a workstati
workstation,
erati ting ng in in se serv rver er mo
mode de (th
ervals
als there
thereaft after.
er. The
The se server
the req
requi uired
red ti time
me in info forma
rmati tion on be betwee
ween sen
sendin
ding g NTP
NTP mes
messag
etric c mod
modes,
es, the
the cli client/
ent/serv
me s s er erve vers rs op oper erat atin ing g ne near ar th the e ro root ot no node des s (l (lowe
and wit
with h a a rel relat ativ ivel ely y la large
mode de th the e id iden enti tity ty of of th the e pe peer er ne need ed no not t be be k k no nown
ate va varia riabl bles es is is cr creat
eated ed on only ly whe
when n th the e pe peer er be beco come
atum lev
level el and
and thu
thus s ine
inelig ligibl ible e as as a a sy synch
mode de is is in inte tende
nded d fo for r us use e by by ti time
ratum) ) of of the
the sy synch
nchroni
ronizat
zation
..........................................................................99 997-0
l'altitude de de de GPS
GPS sont
sont seule
seulement
d'aut utres
res si situ tuat atio ions ns cr crit itiq ique ues s (si (situ tuati ations
NTP da daem
emon on. . Ma
Many ny of of th the e fi fiel elds ds be belo low w ar are e ba bas s ed ed on on th the e
. .
http://www.ntp.org
http://www.ntp.org
The e so sour urce ce is is se sele lect cted ed by by th the e NTP
rmati tion on bas
em pe peer er id ident
entif ifie ied d as as "SYM
(o (on n pa page ge 12 128) 8). .
Hardware Clock
Hardware Clock
SyncSe
cServe
rver r to to a a sy syst stem
mode sends
sends periodic
periodic mess
messages
By op oper erat atin ing g in in th this is mo
mode de th the e ho hos s t, t, us usua uall lly y a a LA
hroni nize zed d by by, , but
this mode
mode sends
sends periodic
By op oper erat atin ing g in in th this is mo
ronize ze a a nd nd be be sy sync nchro
hroni nize zed d by by th the e pee
ordin inari arily ly cre
mmet etri ric c ac acti tive ve mo
mode de an and d pe pers rsis ists ts on only ly as as lo long ng as as th the e
Howeve ver, r, th the e as asso soci ciat atio ion n wil
By op oper erat atin ing g in in th this is mo
hroni nize zed d by by th the e pe peer.
on, for
for exam
example)
ple) occ
(the e Syn
SyncSe
cServe
rver), r), pe perha
rver resp
responds
onds by by sim
simply
ply int interch
rmati tion on an and d ret
return
urnin ing g th the e me
tween n cl clie ient nt req
reque uest sts, s, whi
while le cl clie ients
sages es to to sui
suit t loc
local al con
condit dition
server er dis
distin tincti ction on (alm
(almost
ost) ) dis
rge nu numb
mber er of of pee
wn in in ad adva vanc nce, e, si sinc nce e th the e as asso so- -
when n an an NTP
NTP me
mess ssage
mes s un unre reac acha habl ble e or or is is op oper erat atin ing g at at a a
nchroni
ronizat
zation
ion sou
me se serv rvers
ers ope
operat
ion sub
subnet.
net. Reli
Reliabl
able e tim
time e serv
ment pour
pour la la sync
synchroniz
hronization.
ons de de la la
NTP da dae- e-
based ed on:
on: st strat
ratum
um, , di dist stan ance ce, , di dis- s-
"SYMM_
M_TE(0
TE(0)" )" is is th the e lo loca cal l
em pee
peer, r, us usua uall lly y a a "c "cli lient
ages regardles
regardless s of of the
the reach-
reach-
LAN N wor
but not
not to to sy sync nchro
hroni nize ze th the e pee
periodic mess
messages
ages regardles
regardless s
mode de th the e ho hos s t t
peer. r.
creat ated ed upo
upon n arr
arriv ival al of of a a me
will l al alway
ways s pe pers rsis ist t unt
until il at at
mode de th the e ho host st an anno noun unce ces s
er.
occasion
asionally
ally sends
sends an an NTP
NTP mes-
rhaps ps rig right ht aft
after er reb
reboot
ootin ing g and
erchang
anging
ing addr
address
esses es and
mess ssag age e to to th the e cl clie ient nt. . Serv
Servers
nts are
are fre
free e to to ma
mana nage ge th the e
ions. s.
disappe
appears
ars. . Sym
Symmet
metric ric pas
owest st st stra ratu tum)
peers rs on on an an in inte termi
rmitt tten ent t
age arr
arriv ives es. . Fur
Furth therm
ermore
source.
rce.
ratin ing g ne near ar the
the en end d no nodes
des
service
ice can
can usu
usuall ally y be be
7-0152
1520-0
0-03 3 Rev
Rev. . A A
ation.
ent". ".
work- k-
peer. r.
mes- s-
mes-
and
and
ers
passiv
sive e
m) of
of
ore, ,
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