Nexus 5548 NTP Problem

[Mate Grbavac]

Hi,

I have problem with syncing Nexus and NTP server.

MGMT IP adress of Nexus is 10.24.130.137 and address of NTP server is 10.242.32.12, there is full routing and NTP reachbility between Nexus and NTP but Nexus is unsynced:

N5k-04-A# sh ntp peer-status

Total peers : 1

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

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

    remote               local                 st   poll   reach delay

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

=10.242.32.12           10.24.130.137           2   16     377   0.00310

Config of NTP is:

N5k-04-A# sh run ntp

!Command: show running-config ntp
!Time: Wed Apr 10 14:41:35 2013

version 6.0(2)N1(2)
ntp server 10.242.32.12 use-vrf management
ntp source-interface  mgmt0
ntp logging

I captured traffic with wireshark and see something strange in NTP Packet: "Reference ID: Unindentified reference source '...'"

I have one Catalyst 2960 on same subnet and it's syncronized with same NTP without any problems.

Here is snapshot of wireshark capture:

P.S. Don't bother about malformed packet, it's probably because of using ERSPAN.

[ngoldwat]

Hi

First, what do you get when running

     sh run | i clock

Do you have 'clock protocol ntp' configured?

Otherwise, what are the output results for:

    sh ver

    sh run ntp

    sh ntp peer-status

[Mate Grbavac]

It's a bug.

Workarond is to disable and then enable feature ntp.

N5k-06-A(config)# no feature ntp

N5k-06-A(config)# feature ntp

N5k-06-A(config)# end N5k-06-A(config)# no feature ntp
N5k-06-A(config)# feature ntp
N5k-06-A(config)# end