Nexus WIndows 2012 R2 NTP Dispersion =0 issue

[seansobey]

Note I also posted this in the windows forum...

After more research I found that the IPs that are not allowing our PDC to perform a NTP sync are Cisco Nexus devices, and apparently the Dispersion needs to be set to 0 (default is 10). I went to the following:

hklm\system\curentcontrolset\services\w32tm\config

and modified "localclockdispersion" to 0

Restarted the time service.

It did not work... The PDC is a 2012 R2 server.

How can I make the root dispersion 0?

[seansobey]

I turned debugging on the windows 2012 R2 STD os and below is what I noticed (this is from the nexus device):

151480 15:11:23.7914419s - /-- NTP Packet:
151480 15:11:23.7914419s - | LeapIndicator: 3 - not synchronized;  VersionNumber: 3;  Mode: 3 - Client;  LiVnMode: 0xDB
151480 15:11:23.7914419s - | Stratum: 0 - unspecified or unavailable
151480 15:11:23.7914419s - | Poll Interval: 17 - out of valid range;  Precision: -6 - 15.625ms per tick
151480 15:11:23.7914419s - | RootDelay: 0x0000.0000s - unspecified;  RootDispersion: 0x0001.03FEs - 1.01559s
151480 15:11:23.7914419s - | ReferenceClockIdentifier: 0x00000000 - unspecified

NOTE: the device is a cisco nexus 7710

[seansobey]

From The Nexus device we see that it is communicating (Traffic below)... Is there a compatability issue between nexus and windows 2012 R2?

MTS_OPC_NTP_SHOW_REQ

2015 Sep 29 06:25:28.720569 ntp: ntp_doquery: sendrequest, num attempts = 30

2015 Sep 29 06:25:28.724448 ntp: Sending cmi response with return_code = 0x0

2015 Sep 29 06:25:28.724466 ntp: setting global CMI msg req to NULL

2015 Sep 29 06:25:30.958247 ntp: ntp_process_mts_msg: Opcode received: MTS_OPC_NTP_SHOW_REQ

2015 Sep 29 06:25:30.968490 ntp: ntp_doquery: sendrequest, num attempts = 30

2015 Sep 29 06:25:30.968745 ntp: fsrv_is_shared_intf_vdc(2215): srv_type: 2 vdc_id: 2

2015 Sep 29 06:25:30.968763 ntp: im_get_extension_index(279): Reading iod 0xcf, from ext <267,0> (volatile:/dev/shm/2/im_sdb_extension_267_0)

2015 Sep 29 06:25:30.968778 ntp: im_get_extension_index(295): sdb_read successful - returned pss_datum 0x8f3c804

2015 Sep 29 06:25:30.968785 ntp: im_get_extension_index(302): sdb_read succesful - returned pss_datum, size4, ptr 0x8f3fe1c (val 0xcaa0358)

2015 Sep 29 06:25:30.968823 ntp: Sending cmi response with return_code = 0x0

2015 Sep 29 06:25:30.968838 ntp: setting global CMI msg req to NULL

[seansobey]

I found the bug information below but the NX-OS we are running is 6.2.... Is the bug resolved?

https://tools.cisco.com/bugsearch/bug/CSCts37115

https://tools.cisco.com/bugsearch/bug/CSCud59946