From: tom cheung (tkc9789@xxxxxxxxxxx)
Date: Tue Aug 21 2001 - 19:57:10 GMT-3
Someone correct me if I'm wrong. I was under the impression that when a
router is configured as ntp master, the clients can't change the master's
clock and that authentication is not needed on the master?
>From: "Daniel C. Young" <danyoung99@mediaone.net>
>Reply-To: "Daniel C. Young" <danyoung99@mediaone.net>
>To: <ELAW@dr.dk>, <ccielab@groupstudy.com>
>Subject: RE: ntp problem
>Date: Tue, 21 Aug 2001 13:27:21 -0700
>
>On your clients, you need to configure:
> ntp server 172.20.4.1 key 1
>
>Do a show ntp associations detail to confirm that authentication is
>working.
>Your routers should still synchronize even when authentication is
>misconfigured, but it may be somewhat unstable.
>
>Regards,
>Daniel
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
>ELAW@dr.dk
>Sent: Tuesday, August 21, 2001 1:29 PM
>To: ccielab@groupstudy.com
>Subject: ntp problem
>
>
>I'm trying to configure one of my routers as NTP master and let the other
>routers in my pod use it as ntp server.
>
>Problem is, that they seem to sync nicely initially, and then suddenly it
>fails.
>I haven't caught the actual failure with any debugging.
>
>First I wanted to verify my configs.
>Here are my configs (pod uses 172.20.0.0/16):
>
>Master:
> access-list 72 permit 172.20.0.0 0.0.255.255
> !
> ntp authentication-key 1 md5 0130252D7E 7
> ntp authenticate
> ntp trusted-key 1
> ntp clock-period 17208495
> ntp source Loopback0
> ntp access-group serve 72
> ntp master 1
>
>Client:
> ntp authentication-key 1 md5 08026F672C 7
> ntp authenticate
> ntp trusted-key 1
> ntp clock-period 17179871
> ntp server 172.20.4.1
>
>Master output:
> WGxR4#sh ntp status
> Clock is unsynchronized, stratum 16, no reference clock
> nominal freq is 249.5901 Hz, actual freq is 249.5841 Hz, precision
>is 2**16
> reference time is AF3BDD9C.B4D86D8D (00:55:56.706 UTC Mon Mar 1
>1993)
> clock offset is 0.0000 msec, root delay is 0.00 msec
> root dispersion is 0.02 msec, peer dispersion is 0.02 msec
>
> WGxR4#sh ntp assoc detail
> 127.127.7.1 configured, insane, invalid, stratum 0
> ref ID .LOCL., time AF3BDD9C.B4D86D8D (00:55:56.706 UTC Mon Mar 1
>1993)
> our mode active, peer mode passive, our poll intvl 64, peer poll
>intvl 64
> root delay 0.00 msec, root disp 0.00, reach 0, sync dist 7.828
> delay 0.00 msec, offset 0.0000 msec, dispersion 16000.00
> precision 2**16, version 3
> org time 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)
> rcv time 00000000.00000000 (00:00:00.000 UTC Mon Jan 1 1900)
> xmt time AF3C4B1D.62CDA16D (08:43:09.385 UTC Mon Mar 1 1993)
> filtdelay = 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>0.00
> filtoffset = 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>0.00
> filterror = 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0
>16000.0
> Reference clock status: Running normally
> Timecode:
>
>Client output:
> WGxR2#sh ntp status
> Clock is unsynchronized, stratum 16, no reference clock
> nominal freq is 250.0000 Hz, actual freq is 249.9999 Hz, precision
>is 2**19
> reference time is AF3BDF84.1BCCB682 (01:04:04.108 UTC Mon Mar 1
>1993)
> clock offset is 3.9817 msec, root delay is 17.97 msec
> root dispersion is 5.87 msec, peer dispersion is 1.88 msec
>
> WGxR2#sh ntp assoc det
> 172.20.4.1 configured, insane, invalid, stratum 1
> ref ID .LOCL., time AF3BDD9C.B4D86D8D (00:55:56.706 UTC Mon Mar 1
>1993)
> our mode client, peer mode server, our poll intvl 64, peer poll
>intvl 64
> root delay 0.00 msec, root disp 0.03, reach 0, sync dist 18.707
> delay 17.97 msec, offset 3.9817 msec, dispersion 16000.00
> precision 2**16, version 3
> org time AF3C4B68.8F99112C (08:44:24.560 UTC Mon Mar 1 1993)
> rcv time AF3C4B68.1E079DC7 (08:44:24.117 UTC Mon Mar 1 1993)
> xmt time AF3C4B68.197260FD (08:44:24.099 UTC Mon Mar 1 1993)
> filtdelay = 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>0.00
> filtoffset = 0.00 0.00 0.00 0.00 0.00 0.00 0.00
>0.00
> filterror = 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0 16000.0
>16000.0
>
>--Erik
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