Let us say they want the local router to be ntp server or back up Then y
Bill On Jun 8, 2012, at 2:56 PM, "Jason Murray" <murr...@usa.com> wrote: > Do not use ntp master on any of your routers. The only command that is > needed is the ntp server command. Even if you want one of your routers to be > the NTP server you dont need the ntp master command. > > Jason > >> ----- Original Message ----- >> From: Mann Chaddha >> Sent: 06/08/12 12:19 PM >> To: ccie_voice@onlinestudylist.com >> Subject: [OSL | CCIE_Voice] NTP Master Dilemma >> >> Hi Experts >> >> I am due for my next Lab attempt in 5 days time. I so far have never been >> able to get marks for NTP section. >> >> So I ask this question to the forum that if someone has ever scored 100% in >> the Infra Section (without breaking the NDA of course) , can they lend some >> light on this innocuous looking command, ntp master. >> >> Here are some finding from my POD: [10.10.100.1 = PSTN RTR & 10.10.110.1=HQ >> RTR] >> 1. With NTP Master Command >> >> R1: >> ntp source Loopback0 >> ntp master 10 >> ntp server 10.10.100.1 source Loopback0 >> ! >> clock timezone PST -8 >> clock summer-time PDT recurring >> >> R2: >> ntp server 10.10.110.1 >> >> Show commands: >> R1: >> HQ-R1#sh ntp status >> Clock is unsynchronized, stratum 16, no reference clock >> nominal freq is 250.0000 Hz, actual freq is 250.0008 Hz, precision is 2**24 >> reference time is D37C1C18.AAB00668 (23:37:12.666 PDT Thu Jun 7 2012) >> clock offset is 0.0000 msec, root delay is 0.00 msec >> root dispersion is 0.00 msec, peer dispersion is 0.00 msec >> loopfilter state is 'CTRL' (Normal Controlled Loop), drift is -0.000003145 >> s/s >> system poll interval is 64, last update was 384 sec ago. >> HQ-R1# >> HQ-R1# >> HQ-R1#sh ntp ass >> HQ-R1#sh ntp associations >> >> address ref clock st when poll reach delay offset >> disp >> x~127.127.1.1 .LOCL. 9 16 16 377 0.000 0.000 >> 0.240 >> x~10.10.100.1 .LOCL. 1 50 64 377 0.000 13194.1 3.293 >> * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured >> >> >> R2: >> BR1-R2#sh ntp status >> Clock is unsynchronized, stratum 16, no reference clock >> nominal freq is 250.0000 Hz, actual freq is 249.9990 Hz, precision is 2**24 >> reference time is 00000000.00000000 (16:00:00.000 PST Wed Dec 31 1899) >> clock offset is 0.0000 msec, root delay is 0.00 msec >> root dispersion is 0.01 msec, peer dispersion is 0.00 msec >> loopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000003885 s/s >> system poll interval is 64, never updated. >> BR1-R2# >> BR1-R2#sh ntp ass >> >> address ref clock st when poll reach delay offset >> disp >> ~10.10.110.1 73.78.73.84 16 55 64 300 0.000 1325166 944.35 >> * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured >> >> CUCM: >> admin:utils ntp status >> ntpd (pid 6322) is running... >> >> remote refid st t when poll reach delay offset >> jitter >> ============================================================================== >> *127.127.1.0 LOCAL(0) 10 l 63 64 377 0.000 0.000 >> 0.001 >> 10.10.110.1 .INIT. 16 u 64 128 370 1.897 -2.990 1087693 >> >> >> synchronised to local net at stratum 11 >> time correct to within 12 ms >> polling server every 512 s >> >> Current time in UTC is : Fri Jun 8 06:22:22 UTC 2012 >> Current time in America/Los_Angeles is : Thu Jun 7 23:22:22 PDT 2012 >> >> >> >> ------------------------------------------------------------------------------ >> >> Scenario 2: Without NTP Master Command. >> ------------------------------------------------------------------------------ >> R1: >> ntp source Loopback0 >> ntp server 10.10.100.1 source Loopback0 >> ! >> clock timezone PST -8 >> clock summer-time PDT recurring >> >> R2: >> BR1-R2#r | s ntp >> ntp server 10.10.110.1 >> >> Show Commands: >> >> HQ-R1#sh ntp status >> Clock is synchronized, stratum 2, reference is 10.10.100.1 >> nominal freq is 250.0000 Hz, actual freq is 250.0008 Hz, precision is 2**24 >> reference time is D37C21AB.D80D6753 (00:00:59.843 PDT Fri Jun 8 2012) >> clock offset is -0.0078 msec, root delay is 0.00 msec >> root dispersion is 0.01 msec, peer dispersion is 0.00 msec >> loopfilter state is 'CTRL' (Normal Controlled Loop), drift is -0.000003182 >> s/s >> system poll interval is 64, last update was 264 sec ago. >> HQ-R1# >> >> HQ-R1#sh ntp ass >> >> address ref clock st when poll reach delay offset >> disp >> *~10.10.100.1 .LOCL. 1 11 64 377 0.000 -7.866 2.813 >> * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured >> >> HQ-R1#sh ntp ass d >> 10.10.100.1 configured, our_master, sane, valid, stratum 1 >> ref ID .LOCL., time D37C229E.73B36D17 (00:05:02.451 PDT Fri Jun 8 2012) >> our mode client, peer mode server, our poll intvl 64, peer poll intvl 64 >> root delay 0.00 msec, root disp 0.47, reach 377, sync dist 0.00 >> delay 0.00 msec, offset -7.8662 msec, dispersion 2.81 >> precision 2**24, version 4 >> org time D37C22AE.D47DF91B (00:05:18.830 PDT Fri Jun 8 2012) >> rec time D37C22AE.D7653258 (00:05:18.841 PDT Fri Jun 8 2012) >> xmt time D37C22AE.D6E2248F (00:05:18.839 PDT Fri Jun 8 2012) >> filtdelay = 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 >> filtoffset = -0.01 -0.00 -0.00 -0.00 -0.00 -0.00 -0.00 -0.00 >> filterror = 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 >> minpoll = 6, maxpoll = 10 >> >> >> BR1-R2#sh ntp s >> Clock is synchronized, stratum 3, reference is 10.10.110.1 >> nominal freq is 250.0000 Hz, actual freq is 249.9990 Hz, precision is 2**24 >> reference time is D37C2310.A8751D42 (00:06:56.658 PDT Fri Jun 8 2012) >> clock offset is 0.0034 msec, root delay is 0.00 msec >> root dispersion is 0.96 msec, peer dispersion is 0.93 msec >> loopfilter state is 'CTRL' (Normal Controlled Loop), drift is 0.000003898 s/s >> system poll interval is 64, last update was 7 sec ago. >> BR1-R2# >> BR1-R2# >> BR1-R2# >> BR1-R2#sh ntp ass >> >> address ref clock st when poll reach delay offset >> disp >> *~10.10.110.1 10.10.100.1 2 11 64 17 0.000 3.472 939.41 >> * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured >> >> >> admin:utils ntp status >> ntpd (pid 13103) is running... >> >> remote refid st t when poll reach delay offset >> jitter >> ============================================================================== >> 127.127.1.0 LOCAL(0) 10 l 60 64 377 0.000 0.000 >> 0.001 >> *10.10.110.1 10.10.100.1 2 u 57 64 377 1.718 1.677 5.437 >> >> >> synchronised to NTP server (10.10.110.1) at stratum 3 >> time correct to within 29 ms >> polling server every 64 s >> >> Current time in UTC is : Fri Jun 8 07:07:22 UTC 2012 >> Current time in America/Los_Angeles is : Fri Jun 8 00:07:22 PDT 2012 >> admin: >> >> >> As soon as I apply NTP master command, it breaks my NTP Sync. >> >> Am I missing something stupid in here. Please chime in. >> >> Thanks >> Mann > > > _______________________________________________ > For more information regarding industry leading CCIE Lab training, please > visit www.ipexpert.com > > Are you a CCNP or CCIE and looking for a job? Check out > www.PlatinumPlacement.com
_______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com Are you a CCNP or CCIE and looking for a job? Check out www.PlatinumPlacement.com
