Nx 7000 NTP problem

[Muhammed AKYUZ]

hi,

i am not able to work ntp on Nexus. Same config works on other nexus.

NX1(config)# ntp commit

NX1(config)# 2000 Jan  1 11:13:07.117520 ntp: ntp_get_session_info: fc_ct_get_session_context failed [0x40bb0007]

2000 Jan  1 11:13:07.118988 ntp: ntp_conf_peer: Added element  1d0a0a0a to peer_list

2000 Jan  1 11:13:07.119149 ntp: ntp_conf_peer: Added element  1e0a0a0a to peer_list

2000 Jan  1 11:13:07.119278 ntp: ntp_conf_peer: Added element  1f0a0a0a to peer_list

2000 Jan  1 11:13:07.119402 ntp: ntp_conf_peer: Added element  200a0a0a to peer_list

2000 Jan  1 11:13:07.122960 ntp: ntp_conf_peer: Added element  1d0a0a0a to peer_list

2000 Jan  1 11:13:07.123061 ntp: ntp_conf_peer: Added element  1e0a0a0a to peer_list

2000 Jan  1 11:13:07.123150 ntp: ntp_conf_peer: Added element  1f0a0a0a to peer_list

2000 Jan  1 11:13:07.123240 ntp: ntp_conf_peer: Added element  200a0a0a to peer_list

NX1(config)# end

NX1# 2000 Jan  1 11:13:17 NX1 %VSHD-5-VSHD_SYSLOG_CONFIG_I: Configured from vty by admin on 192.168.201.5@pts/25

NX1#

NX1# sh clock

11:13:20.422 TURKEY Sat Jan 01 2000

NX1# sh run ntp

!Command: show running-config ntp

!Time: Sat Jan  1 11:13:28 2000

version 6.0(1)

ntp distribute

ntp server 10.10.10.29 use-vrf management

ntp server 10.10.10.30 use-vrf management

ntp server 10.10.10.31 use-vrf management

ntp server 10.10.10.32 use-vrf management

ntp source-interface  mgmt0

ntp commit

NX1# sh ntp peers

NX1# 2000 Jan  1 11:15:13.125365 ntp: ntp_handle_show_peer_list: Could not get peer list, ret_val = 1077346326, num_recvd = 0

NX1# sh ntp peers ?

  <CR>  

  >      Redirect it to a file

  >>     Redirect it to a file in append mode

  |      Pipe command output to filter

NX1# sh ntp peer-status

NX1# 2000 Jan  1 11:15:24.636950 ntp: ntp_handle_show_peer_summary: Could not get peer summary, ret_val = 1077346326, num_recvd = 0

What should be the problem?

[Muhammed AKYUZ]

just and only

ntp server 10.10.10.29

2960 switch

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[Jerry Ye]

hm... Interesting, I am kind of out of clue right now, I know there is a bug where non default VDC not able to sync with the NTP server.

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[Muhammed AKYUZ]

it runs 6.01

i setup another 4 boxes which belongs to another customer, they do not have the problem. there is just ntp server command

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[andrew.schaefer]

I just upgraded to 5.2(3a) so I would be able to use my 7Ks as NTP servers.  It seems that I can only get them to function using the default VDC.  When I setup the NTP servers in my second production VDC nothing works.  A show of ntp peers results in exactly what Muhammed was seeing.  Anyone have any ideas?

[Jerry Ye]

Here is the bug ID

CSCtt17080

I kind of suspect Muhammed is hitting the same bug.

Regards,

jerry

[andrew.schaefer]

Thanks Jerry,

I have the bug saved, I'll keep an eye on it.  I'm probably going to configure the default VDCs as NTP servers for now, if only they would resolve DNS addresses and not give me the error "Cannot resolve the domain name."

Andrew

[Jerry Ye]

Do you have internal NTP server? If you do, you can use its IP instead of rely on DNS to resolve the host name.

Regards,

jerry

[andrew.schaefer]

I was planning on using the 4 7Ks as the internal NTP servers for our entire network.  The only other NTP servers are a few Windows 2008 servers, which I didn't think were as reliable.  I was hoping to sync them with the 0.us.pool.ntp.org servers which change their IPs regularly.  I forgot I hadn't turned on the ip domain-lookup. 

[Jerry Ye]

Okay. Thanks for sharing your setup. You would also set up your 7Ks as NTP peer which should provide more reliable NTP clock.

Regards,

jerry

[dan_voyer]

hi

in the default VDC, make sure you have the following command:

use the clock protocol ntp vdc (default vdc-id ) in my case I want the default VDC to set the time for entire box / VDC's.

I am presently monkeying around these configs in my lab. I can try some config for you, if you wish.

right now my configs are:

ntp server 10.199.0.190 prefer use-vrf management // my linux NTP server

ntp peer 10.199.255.25 use-vrf management //my second N7K box mgmt0 interface

ntp source-interface  mgmt0

ntp logging

this works like a charm.

N7K1_DEFAULT(config)# sh ntp peer-status

Total peers : 2

* - selected for sync, + -  peer mode(active),

- - peer mode(passive), = - polled in client mode

    remote               local                 st   poll   reach delay   vrf

-------------------------------------------------------------------------------

*10.199.0.190           10.199.255.20           3   64     377   0.00084 management

+10.199.255.25          10.199.255.20           4   64     377   0.00079 management

HTH

danv