From: John Tafasi (johntafasi@yahoo.com)
Date: Tue Dec 03 2002 - 23:46:58 GMT-3
Hi group,
I have r2 (ntp server) and r5 (ntp client) exchnaging (or supposed to) ntp
information accross an isdn link. r2 is configured to broadcast ntp packets
via its bri0 interface and is doing so sucessfully. r5 is receiving the ntp
packets but the "debug ntp packets" on r5 does not produce any output. I can
see the packets arriving at r5 from the output of the "debug ip packet" on
r5. r5 stil not synchronized. what is the problem?How ntp broadcast should
be configured for this to be successfull? Has any one tried this on an
ethernet segment? I have a feeling that ntp broadcast will not work on an
isdn link
I have included the following snippet from both routers' configuration. Also
bear in mind that I am connected to both routers through the console. Thank
you for any comment
hostname r2-2516
!
interface BRI0
no ip address
no ip directed-broadcast
encapsulation ppp
dialer pool-member 1
isdn spid1 0835866101
isdn spid2 0835866301
!
interface Dialer1
ip address 10.10.10.1 255.255.255.0
no ip directed-broadcast
encapsulation ppp
dialer remote-name r5
dialer idle-timeout 2147483
dialer string 8358662
dialer pool 1
dialer-group 1
ntp broadcast
pulse-time 0
ppp chap hostname r2
!
!
ntp clock-period 17179826
ntp master
end
r2-2516#show ntp status
Clock is synchronized, stratum 8, reference is 127.127.7.1
nominal freq is 250.0000 Hz, actual freq is 250.0006 Hz, precision is 2**19
reference time is C197833E.E008EAFC (19:23:42.875 UTC Tue Dec 3 2002)
clock offset is 0.0000 msec, root delay is 0.00 msec
root dispersion is 0.02 msec, peer dispersion is 0.02 msec
r2-2516#show ntp associations
address ref clock st when poll reach delay offset
disp
*~127.127.7.1 127.127.7.1 7 55 64 377 0.0 0.00
0.0
* master (synced), # master (unsynced), + selected, - candidate, ~
configured
r2-2516#
==================
hostname R5-2503
!
interface BRI0
ip address 10.10.10.2 255.255.255.0
encapsulation ppp
dialer idle-timeout 2147483
dialer map ip 10.10.10.1 name r2 broadcast 8358661
dialer-group 1
isdn switch-type basic-ni
isdn spid1 0835866201
isdn spid2 0835866401
cdapi buffers regular 0
cdapi buffers raw 0
cdapi buffers large 0
ppp authentication chap
ppp chap hostname r5
ppp multilink
!
ntp clock-period 17179601
end
R5-2503#show ntp stat
Clock is unsynchronized, stratum 16, no reference clock
nominal freq is 250.0000 Hz, actual freq is 250.0039 Hz, precision is 2**19
reference time is AF3BF1EE.0D8B939B (02:22:38.052 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
R5-2503#
R5-2503#show ntp associ
address ref clock st when poll reach delay offset
disp
* master (synced), # master (unsynced), + selected, - candidate, ~
configured
R5-2503#
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