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tech:network:cisco:ntp:ntp
Table of Contents
NTP
Topology
Physical Lab.
Initial config
- /etc/chrony/chrony.conf
pool ntp.nict.jp iburst pool ntp.jst.mfeed.ad.jp iburst allow 192.168.10.0/24 allow 172.16.0.0/12
- R2
en conf t ! ! ip configuration int f0/1 ip addr dhcp no shut exit int f0/0 ip addr 172.16.2.2 255.255.255.0 no shut exit ! ip name-server 8.8.8.8 8.8.4.4 1.1.1.1 ! end
R2#
*May 29 23:57:41.935: %SYS-5-CONFIG_I: Configured from console by console
R2#
*May 29 23:57:44.791: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/1, changed state to up
*May 29 23:57:44.915: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
R2#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.2.0/24 is directly connected, FastEthernet0/0
L 172.16.2.2/32 is directly connected, FastEthernet0/0
R2#sh ip int bri
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 172.16.2.2 YES manual up up
FastEthernet0/1 unassigned YES DHCP up up
Serial0/0/0 unassigned YES NVRAM administratively down down
R2#
*May 29 23:58:21.511: %DHCP-6-ADDRESS_ASSIGN: Interface FastEthernet0/1 assigned DHCP address 192.168.10.23, mask 255.255.255.0, hostname R2
R2#sh ip int bri
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 172.16.2.2 YES manual up up
FastEthernet0/1 192.168.10.23 YES DHCP up up
Serial0/0/0 unassigned YES NVRAM administratively down down
R2#sh ip ro
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
+ - replicated route, % - next hop override
Gateway of last resort is 192.168.10.1 to network 0.0.0.0
S* 0.0.0.0/0 [254/0] via 192.168.10.1
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.2.0/24 is directly connected, FastEthernet0/0
L 172.16.2.2/32 is directly connected, FastEthernet0/0
192.168.10.0/24 is variably subnetted, 2 subnets, 2 masks
C 192.168.10.0/24 is directly connected, FastEthernet0/1
L 192.168.10.23/32 is directly connected, FastEthernet0/1
R2#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R2(config)#ip name-server 8.8.8.8 8.8.4.4 1.1.1.1
R2(config)#^Z
R2#
*May 29 23:59:42.023: %SYS-5-CONFIG_I: Configured from console by console
R2#ping 8.8.8.8
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 8.8.8.8, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 8/10/12 ms
R2#ping www.google.co.jp
Translating "www.google.co.jp"...domain server (203.138.71.154) [OK]
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 172.217.161.195, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 16/17/20 ms
✘╹◡╹✘ 18-05-30 9:04:34 /home/wnoguchi
% ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
valid_lft forever preferred_lft forever
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether f4:30:b9:3c:99:56 brd ff:ff:ff:ff:ff:ff
inet 192.168.10.21/24 brd 192.168.10.255 scope global dynamic enp3s0
valid_lft 174600sec preferred_lft 174600sec
inet6 fe80::de50:dd15:552c:9161/64 scope link
valid_lft forever preferred_lft forever
3: enx84afec739c0a: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
link/ether 84:af:ec:73:9c:0a brd ff:ff:ff:ff:ff:ff
inet 172.16.2.245/24 brd 172.16.2.255 scope global enx84afec739c0a
valid_lft forever preferred_lft forever
inet6 fe80::86af:ecff:fe73:9c0a/64 scope link
valid_lft forever preferred_lft forever
4: wlo1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN group default qlen 1000
link/ether 7c:67:a2:29:00:68 brd ff:ff:ff:ff:ff:ff
✘╹◡╹✘ 18-05-30 9:04:52 /home/wnoguchi
% sudo apt -y install chrony
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
libtomcrypt0 libtommath1
The following NEW packages will be installed:
chrony libtomcrypt0 libtommath1
0 upgraded, 3 newly installed, 0 to remove and 1 not upgraded.
Need to get 522 kB of archives.
After this operation, 1,328 kB of additional disk space will be used.
Get:1 http://jp.archive.ubuntu.com/ubuntu artful/main amd64 libtommath1 amd64 1.0-4 [45.2 kB]
Get:2 http://jp.archive.ubuntu.com/ubuntu artful/universe amd64 libtomcrypt0 amd64 1.17-9 [285 kB]
Get:3 http://jp.archive.ubuntu.com/ubuntu artful/universe amd64 chrony amd64 3.1-5 [192 kB]
Fetched 522 kB in 0s (936 kB/s)
Selecting previously unselected package libtommath1:amd64.
(Reading database ... 290289 files and directories currently installed.)
Preparing to unpack .../libtommath1_1.0-4_amd64.deb ...
Unpacking libtommath1:amd64 (1.0-4) ...
Selecting previously unselected package libtomcrypt0:amd64.
Preparing to unpack .../libtomcrypt0_1.17-9_amd64.deb ...
Unpacking libtomcrypt0:amd64 (1.17-9) ...
Selecting previously unselected package chrony.
Preparing to unpack .../chrony_3.1-5_amd64.deb ...
Unpacking chrony (3.1-5) ...
Setting up libtommath1:amd64 (1.0-4) ...
Processing triggers for ureadahead (0.100.0-20) ...
ureadahead will be reprofiled on next reboot
Setting up libtomcrypt0:amd64 (1.17-9) ...
Processing triggers for libc-bin (2.26-0ubuntu2.1) ...
Processing triggers for systemd (234-2ubuntu12.3) ...
Processing triggers for man-db (2.7.6.1-2) ...
Setting up chrony (3.1-5) ...
Creating '_chrony' system user/group for the chronyd daemon…
Creating config file /etc/chrony/chrony.conf with new version
Creating config file /etc/chrony/chrony.keys with new version
Created symlink /etc/systemd/system/chronyd.service → /lib/systemd/system/chrony.service.
Created symlink /etc/systemd/system/multi-user.target.wants/chrony.service → /lib/systemd/system/chrony.service.
Processing triggers for systemd (234-2ubuntu12.3) ...
Processing triggers for ureadahead (0.100.0-20) ...
✘╹◡╹✘ 18-05-30 9:05:34 /home/wnoguchi
% sudo vim /etc/chrony/chrony.conf
✘╹◡╹✘ 18-05-30 9:06:40 /home/wnoguchi
% sudo systemctl restart chrony
✘╹◡╹✘ 18-05-30 9:06:46 /home/wnoguchi
% sudo chronyc sources
210 Number of sources = 7
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^+ ntp-a2.nict.go.jp 1 6 17 1 +47us[ +13us] +/- 5084us
^+ ntp-b2.nict.go.jp 1 6 17 1 +180us[ +141us] +/- 5112us
^* ntp-b3.nict.go.jp 1 6 17 0 -139us[ -195us] +/- 5381us
^+ ntp-a3.nict.go.jp 1 6 17 0 -178us[ -229us] +/- 5325us
^- ntp3.jst.mfeed.ad.jp 2 6 17 0 -86us[ -132us] +/- 116ms
^- ntp1.jst.mfeed.ad.jp 2 6 17 1 -1604us[-1626us] +/- 75ms
^- ntp2.jst.mfeed.ad.jp 2 6 17 1 -280us[ -308us] +/- 80ms
✘╹◡╹✘ 18-05-30 9:06:54 /home/wnoguchi
% sudo chronyc sources
210 Number of sources = 7
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^+ ntp-a2.nict.go.jp 1 6 17 13 +47us[ +13us] +/- 5084us
^+ ntp-b2.nict.go.jp 1 6 17 13 +180us[ +141us] +/- 5112us
^* ntp-b3.nict.go.jp 1 6 17 12 -139us[ -195us] +/- 5381us
^+ ntp-a3.nict.go.jp 1 6 17 12 -178us[ -229us] +/- 5325us
^- ntp3.jst.mfeed.ad.jp 2 6 17 12 -86us[ -132us] +/- 116ms
^- ntp1.jst.mfeed.ad.jp 2 6 17 13 -1604us[-1626us] +/- 75ms
^- ntp2.jst.mfeed.ad.jp 2 6 17 13 -280us[ -308us] +/- 80ms
✘╹◡╹✘ 18-05-30 9:07:06 /home/wnoguchi
% sudo chronyc sources
210 Number of sources = 7
MS Name/IP address Stratum Poll Reach LastRx Last sample
===============================================================================
^+ ntp-a2.nict.go.jp 1 6 17 16 +47us[ +13us] +/- 5084us
^+ ntp-b2.nict.go.jp 1 6 17 16 +180us[ +141us] +/- 5112us
^* ntp-b3.nict.go.jp 1 6 17 15 -139us[ -195us] +/- 5381us
^+ ntp-a3.nict.go.jp 1 6 17 15 -178us[ -229us] +/- 5325us
^- ntp3.jst.mfeed.ad.jp 2 6 17 15 -86us[ -132us] +/- 116ms
^- ntp1.jst.mfeed.ad.jp 2 6 17 16 -1604us[-1626us] +/- 75ms
^- ntp2.jst.mfeed.ad.jp 2 6 17 16 -280us[ -308us] +/- 80ms
✘╹◡╹✘ 18-05-30 9:07:09 /home/wnoguchi
% sudo date
Wed May 30 09:09:01 JST 2018
Configure NTP
conf t ! ntp server ntp.jst.mfeed.ad.jp ntp server ntp.nict.jp ntp server 192.168.10.21 prefer ! ntp source f0/1 ! ntp update-calendar ! end
R2(config)#ntp server ntp.jst.mfeed.ad.jp Translating "ntp.jst.mfeed.ad.jp"...domain server (203.138.71.154) [OK] R2(config)#ntp server ntp.nict.jp Translating "ntp.nict.jp"...domain server (203.138.71.154) [OK] R2(config)#ntp server 192.168.10.21 prefer R2(config)#ntp source f0/1
Verify
R2#sh ntp associations address ref clock st when poll reach delay offset disp ~192.168.10.21 .INIT. 16 - 64 0 0.000 0.000 15937. ~210.173.160.57 133.243.236.17 2 45 64 17 9.276 -9.838 1.719 *~133.243.238.244 .NICT. 1 41 64 17 10.117 -4.679 2.669 * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
why synchronize private NTP server… and stratum max 16.
OK, I identify chrony misconfiguration.
After allow network f0/1, f0/0 synchronized private NTP server stratum 2.
R2#sh ntp associations address ref clock st when poll reach delay offset disp *~192.168.10.21 133.243.238.16 2 40 64 3 1.153 -60.371 0.117 +~210.173.160.57 133.243.236.17 2 40 64 377 9.608 -60.690 2.174 +~133.243.238.244 .NICT. 1 39 64 377 10.656 -61.192 2.290 * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured R2#sh ntp associations address ref clock st when poll reach delay offset disp *~192.168.10.21 133.243.238.16 2 101 128 377 1.171 -67.505 4.614 +~210.173.160.57 133.243.236.17 2 24 128 377 9.539 -85.043 3.946 +~133.243.238.244 .NICT. 1 23 128 377 10.518 -70.877 6.527 * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
133.243.238.244 reference NICT.
also ntp.jst.mfeed.ad.jp, private NTP server references ntp.nict.jp.
133.243.238.16 - Japan - IP Address Details - IP lookup - proxio.io
R2#sh ntp status Clock is synchronized, stratum 3, reference is 192.168.10.21 nominal freq is 250.0000 Hz, actual freq is 250.0001 Hz, precision is 2**24 reference time is DEB86F20.B292FEEC (00:30:24.697 UTC Wed May 30 2018) clock offset is -67.5055 msec, root delay is 11.97 msec root dispersion is 81.33 msec, peer dispersion is 6.13 msec loopfilter state is 'CTRL' (Normal Controlled Loop), drift is -0.000000502 s/s system poll interval is 128, last update was 436 sec ago. R2#sh clock 00:39:42.187 UTC Wed May 30 2018
Reset Lab
- R1
en conf t ! int f0/0 ip addr 172.16.2.1 255.255.255.0 no shut exit ! end
- R2
en conf t ! ! ip configuration int f0/0 ip addr 172.16.2.2 255.255.255.0 no shut exit ! end
R2#sh clock *23:36:31.799 UTC Wed May 30 2018
R1#sh clock *22:32:46.387 UTC Wed May 30 2018 R1#sh ntp associations R1#sh ntp status %NTP is not enabled.
- R1
en conf t ! ntp server 172.16.2.2 ! ntp source f0/0 ! ntp update-calendar ! end
R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#ntp server 172.16.2.1 R1(config)#ntp update-calendar R1(config)#^Z R1# *May 30 22:37:23.903: %SYS-5-CONFIG_I: Configured from console by console R1#sh ntp asso R1#sh ntp associations address ref clock st when poll reach delay offset disp ~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 16000. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured R1#sh clock *22:37:43.457 UTC Wed May 30 2018
- R2
en conf t ! ntp source f0/0 ntp master 7 ! end
R2#conf t Enter configuration commands, one per line. End with CNTL/Z. R2(config)#ntp source f0/0 R2(config)#ntp master 7 R2(config)#^Z R2# May 30 23:43:04.875: %SYS-5-CONFIG_I: Configured from console by console
R1#sh ntp associations address ref clock st when poll reach delay offset disp ~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured R1#sh ntp associations address ref clock st when poll reach delay offset disp ~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured R1#ping 172.16.2.1 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.2.1, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms R1#sh ntp associations address ref clock st when poll reach delay offset disp ~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
wait 1 minute.
stratum still infinity…
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#no ntp ser
R1(config)#no ntp server 172.16.2.1
R1(config)#do sh ntp assoc
R1(config)#ntp server 172.16.2.1
R1(config)#do sh ntp assoc
address ref clock st when poll reach delay offset disp
~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
R1(config)#do sh ntp assoc
address ref clock st when poll reach delay offset disp
~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
R1(config)#do sh ntp assoc
address ref clock st when poll reach delay offset disp
~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
R1(config)#do sh ntp assoc
address ref clock st when poll reach delay offset disp
~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
R1(config)#ntp server 172.16.2.1 prefer
R1(config)#do sh ntp assoc
address ref clock st when poll reach delay offset disp
~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 16000.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
R1(config)#do sh ntp assoc
address ref clock st when poll reach delay offset disp
~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 16000.
* sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
R1(config)#conf t
^
% Invalid input detected at '^' marker.
R1(config)#ntp source f0/0
R2#sh run | i ntp ntp source FastEthernet0/0 ntp master 7
R1(config)#do sh run | i ntp ntp source FastEthernet0/0 ntp update-calendar ntp server 172.16.2.1 prefer
R1#ntp ? clear Clear the values R1#ntp cle R1#ntp clear ? drift Clear the current drift value that is being used R1#ntp clear % Incomplete command. R1#ntp clear dr R1#ntp clear drift ? <cr> R1#ntp clear drift R1#sh ntp associations address ref clock st when poll reach delay offset disp ~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
R1#debug ntp ? adjust NTP clock adjustments all NTP all debugging on core NTP core messages events NTP events packet NTP packet debugging refclock NTP refclock messages R1#debug ntp % Incomplete command. R1#debug ntp eve R1#debug ntp events NTP events debugging is on R1#debug ntp events NTP events debugging is on R1#sh ntp associations address ref clock st when poll reach delay offset disp ~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured R1#u all All possible debugging has been turned off R1#nt R1#ntp pa R1#de R1#deb R1#debug n R1#debug nt R1#debug ntp all NTP events debugging is on NTP core messages debugging is on NTP clock adjustments debugging is on NTP reference clocks debugging is on NTP packets debugging is on R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#no ntp server 172.16.2.1 prefer R1(config)#ntp server 172.16.2.1 prefer R1(config)#no ntp server 172.16.2.1 prefer *May 30 22:55:17.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)# *May 30 22:55:19.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)# *May 30 22:55:21.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)# *May 30 22:55:23.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)# *May 30 22:55:25.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)#no ntp server 172.16.2.1 prefer *May 30 22:55:27.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)# *May 30 22:55:29.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)# *May 30 22:55:31.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)#do sh *May 30 22:55:33.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1). R1(config)#do sh ntp assoc address ref clock st when poll reach delay offset disp ~172.16.2.1 .INIT. 16 - 64 0 0.000 0.000 15937. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured
no response?
R2#sh ip int b Interface IP-Address OK? Method Status Protocol FastEthernet0/0 172.16.2.2 YES manual up up FastEthernet0/1 unassigned YES NVRAM administratively down down Serial0/0/0 unassigned YES NVRAM administratively down down
R1#sh ip int b Interface IP-Address OK? Method Status Protocol FastEthernet0/0 172.16.2.1 YES manual up up FastEthernet0/1 unassigned YES NVRAM administratively down down Serial0/0/0 unassigned YES NVRAM administratively down down R1# *May 30 22:56:22.552: NTP message sent to 172.16.2.1, from interface 'FastEthernet0/0' (172.16.2.1).
OK, My specify NTP server misconfiguration…
This indicate R1 self… lol
R1#ping 172.16.2.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.2.2, timeout is 2 seconds: .!!!! Success rate is 80 percent (4/5), round-trip min/avg/max = 1/1/4 ms R1#ping 172.16.2.2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 172.16.2.2, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#no ntp server 172.16.2.1 prefer R1(config)#ntp server 172.16.2.2 R1(config)#^Z R1# *May 30 22:59:02.548: %SYS-5-CONFIG_I: Configured from console by console *May 30 22:59:02.552: NTP message sent to 172.16.2.2, from interface 'FastEthernet0/0' (172.16.2.1). *May 30 22:59:02.552: NTP message received from 172.16.2.2 on interface 'FastEthernet0/0' (172.16.2.1). *May 30 22:59:02.552: NTP Core(DEBUG): ntp_receive: message received *May 30 22:59:02.552: NTP Core(DEBUG): ntp_receive: peer is 0x65AFA648, next action is 1. *May 30 22:59:02.552: NTP Core(DEBUG): receive: packet given to process_packet *May 30 22:59:02.552: NTP Core(DEBUG): Peer becomes reachable, poll set to 6. *May 30 22:59:02.552: NTP Core(INFO): peer 172.16.2.2 event 'event_reach' (0x84) status 'unreach, conf, 1 event, event_reach' (0x8014) R1# *May 30 22:59:02.556: NTP Core(INFO): synchronized to 172.16.2.2, stratum 7 *May 30 22:59:02.556: NTP: step(0x00000F09.ACF81289): local_offset = 0x00000000.00000000, curtime = 0xDEB9AB36.8E7D48D0 *May 31 00:03:12.232: NTP Core(NOTICE): time reset 3849.675660 s R1#sh ntp assoc address ref clock st when poll reach delay offset disp ~172.16.2.2 .STEP. 16 11 64 0 0.000 0.000 16000. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured R1#sh ntp assoc address ref clock st when poll reach delay offset disp ~172.16.2.2 .STEP. 16 14 64 0 0.000 0.000 16000. * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured R1# *May 31 00:03:28.228: NTP message sent to 172.16.2.2, from interface 'FastEthernet0/0' (172.16.2.1). *May 31 00:03:28.228: NTP message received from 172.16.2.2 on interface 'FastEthernet0/0' (172.16.2.1). *May 31 00:03:28.228: NTP Core(DEBUG): ntp_receive: message received *May 31 00:03:28.228: NTP Core(DEBUG): ntp_receive: peer is 0x65AFA648, next action is 1. *May 31 00:03:28.228: NTP Core(DEBUG): receive: packet given to process_packet *May 31 00:03:28.228: NTP Core(DEBUG): Peer becomes reachable, poll set to 6. *May 31 00:03:28.228: NTP Core(INFO): peer 172.16.2.2 event 'event_reach' (0x84) status 'unreach, conf, 2 events, event_reach' (0x8024) R1# *May 31 00:03:28.228: NTP Core(INFO): synchronized to 172.16.2.2, stratum 7 R1#sh ntp assoc address ref clock st when poll reach delay offset disp *~172.16.2.2 127.127.1.1 7 15 64 1 2.246 0.111 7937.5 * sys.peer, # selected, + candidate, - outlyer, x falseticker, ~ configured R1#sh ntp sta R1#sh ntp status Clock is unsynchronized, stratum 16, reference is 172.16.2.2 nominal freq is 250.0000 Hz, actual freq is 250.0000 Hz, precision is 2**24 reference time is 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900) clock offset is 0.1116 msec, root delay is 0.00 msec root dispersion is 0.63 msec, peer dispersion is 7937.50 msec loopfilter state is 'FREQ' (Drift being measured), drift is 0.000000000 s/s system poll interval is 64, never updated. R1#u all All possible debugging has been turned off
R2 references loopback address.
R1#sh clock *00:06:31.540 UTC Thu May 31 2018
R2#sh clock 00:06:39.443 UTC Thu May 31 2018
References
tech/network/cisco/ntp/ntp.txt · Last modified: 2018/05/31 09:09 by wnoguchi
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