From: Tomasz Bartel (tbartel@xxxxxxxxxx)
Date: Thu Jun 07 2001 - 14:11:13 GMT-3
THX, now it is clear for me.
Tomek
At 13:13 01-06-07 -0400, Pickell, Aaryn wrote:
>When you configure the 'ntp master' command, the router will poll to itself,
>using the 127.127.7.1 command. Remember; that's a local loopback. It's
>just necessary so that the router can use that as the ref-id for later on.
>
>If you leave the routers sitting for a while, they'll sync up fine. It's
>just going to take a while to do it. Especially if you take a few minutes
>to change the time on the master router, it will already have given 1993
>time to all the clients. When they detect that the time from the master has
>changed, they'll have to make several polls to it, then reset their state
>tables, then make several more polls to the master, THEN sync. If you have
>the option, reload the master first, then manually change the clock, then
>reload the rest of them. It'll speed things up some.
>
>By the way, 3600 routers don't have calanders, so the 'ntp update-calander'
>command isn't there.
>
>Aaryn Pickell - CCNP ATM, CCDP, MCSE
>Senior Engineer - Routing Protocols
>Getronics Inc.
>Direct: 713-394-1609
>Email:aaryn.pickell@getronics.com
>
>This e-mail message and any attachments are confidential and may be
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>
>
> > -----Original Message-----
> > From: Tomasz Bartel [mailto:tbartel@rubikon.pl]
> > Sent: Thursday, June 07, 2001 4:16 AM
> > To: erickbe@yahoo.com; ccielab@groupstudy.com
> > Subject: Re: NTP questions
> >
> >
> > Connectivity is OK, I can ping any address loopbacks also.
> > Here is screen shot from 3620 in terms of ntp commands on my router.
> >
> > WG1R3(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
> >
> > I set up clock immediately after router (3620) came up and it
> > not helped.
> > What I also don't understand is why on 3620 association
> > status is like this:
> >
> > address ref clock st when poll
> > reach delay offset disp
> > ~ .LOCL. 0 - 64 0
> > 0.0 0.00
> > 16000.
> > * master (synced), # master (unsynced), + selected, -
> > candidate, ~ configured
> >
> > Tomek
> >
> >
> > At 02:02 01-06-07 -0700, Erick B. wrote:
> > >The calendar feature isn't supported on the 3620 I
> > >don't believe. It's only on higher-end routers that
> > >have a battery to maintain time between boots. You
> > >need to set the clock after a reboot on routers not
> > >acting as a ntp client.
> > >
> > >The router will start with a time back in 1992 or 1993
> > >if the clock isn't set. Now, if you reset the entire
> > >rack then the time should be similar on all the
> > >routers unless they have calendars, getting time from
> > >another ntp source, etc. I have seen ntp take awhile
> > >to sync up and previous postings here on the subject
> > >have said it can take awhile.
> > >
> > >Can the routers ping the 3620s loopback after the
> > >resets?? Make sure connectivity wasn't lost...
> > >
> > >--- Tomasz Bartel <tbartel@rubikon.pl> wrote:
> > > > Guys,
> > > >
> > > > Maybe it is simple to solve this problem but I don't
> > > > know how to do this. I
> > > > have configured ntp server on 3620 router and
> > > > clients on 2514. When I
> > > > reboot whole rack all routers looses
> > > > synchronization.
> > > > What is the problem?
> > > > Configurations are very simple, on 3620:
> > > >
> > > > ntp master
> > > > ntp source loopback 1
> > > >
> > > > I know that should be also ntp update-calendar, but
> > > > I can't put this
> > > > command (IOS c3620-d-mz_121-5_T8.bin). Actually
> > > > there is no "ntp
> > > > update-calendar" command in my IOS.
> > > >
> > > > On 25134
> > > >
> > > > ntp server (loopback 1 address on 3620)
> > > >
> > > > Every nets are reachable. I use OSPF.
> > > >
> > > > Tomek
> > > > **Please
> > > > read:http://www.groupstudy.com/list/posting.html
> > > >
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