[ntp:questions] Re: latest dev snap won't peer with IOS ntp

Joshua Coombs jcoombs at gwi.net
Fri Apr 22 16:46:48 UTC 2005


> Start by trimming your list of servers.   There's no way nptd can 
> use more than ten at a time and there is seldom any need to use more 
> than five.  You will note that six of them are in the .INIT. state 
> and not reachable!  Five servers are sufficient to vote out two bad 
> ones and seven can vote out three bad ones.   Prune the servers with 
> the longest round trip delays.
>
> What command did you use to configure ntp on your Cisco router? 
> I've not read of any way to cause a Cisco router to peer with 
> another server

ntp clock-period 17179851
ntp source FastEthernet0
ntp update-calendar
ntp server 64.142.103.194
ntp server 67.128.71.65
ntp server 137.146.210.250
ntp server 67.128.71.76
ntp server 67.128.71.75
ntp server 18.26.4.105
ntp peer 192.168.1.113
ntp server 204.152.184.72
ntp server 66.92.68.246
ntp peer 207.5.128.20
ntp peer 207.5.142.56
ntp server 208.184.49.9
ntp server 158.121.95.4

IOS supports both peer and server declarations;
omega(config)#ntp ?
  access-group        Control NTP access
  authenticate        Authenticate time sources
  authentication-key  Authentication key for trusted time sources
  broadcastdelay      Estimated round-trip delay
  clock-period        Length of hardware clock tick
  master              Act as NTP master clock
  max-associations    Set maximum number of associations
  peer                Configure NTP peer
  server              Configure NTP server
  source              Configure interface for source address
  trusted-key         Key numbers for trusted time sources
  update-calendar     Periodically update calendar with NTP time




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