From: Chris Riling (criling@gmail.com)
Date: Fri Nov 02 2007 - 20:17:07 ART
Thanks, didn't see that before...
On 11/2/07, kang lee <kanghlee@gmail.com> wrote:
>
> Chris,
> This is from cisco site command reference.
> "ntp disable
>
> To prevent an interface from receiving Network Time Protocol (NTP)
> packets, use the *ntp disable* interface configuration command. To enable
> receipt of NTP packets on an interface, use the *no* form of this command.
>
> *ntp disable
> no ntp disable* "
>
>
> This command just prevents to receiving NTP packets on that interface.
>
>
> On 11/1/07, Chris Riling < criling@gmail.com> wrote:
> >
> > I'm sorry, I should have clarified. You are correct, It's a L3 "routed"
> > port
> > - customer facing. I have the switch configured to sync time via NTP, so
> > it
> > is running globally. My question was this: if I put "NTP disable" on the
> > L3
> > port, does it just disable the global NTP services from ever using the
> > port,
> > or does it block all NTP traffic flowing *through* the port? I'm
> > inclined to
> > say the logical answer is only number one. Which leads me to my *next*
> > question. If you only have the switch configured to use an NTP server,
> > and
> > not to act as a master, why would it listen for NTP on every port?
> > (Other
> > than the obvious "it's a global command" respone...) One would think it
> > should only ever do any sort of NTP activity on the interface that's
> > facing
> > the server that's configured (unless of course you configure the switch
> > to
> > provide the time itself to other NTP peers)...
> >
> > Thanks!
> > Chris
> >
> >
> > On 11/1/07, Usankin, Andrew < Andrew.Usankin@twtelecom.com> wrote:
> > >
> > >
> > > NTP is an IP suite protocol. So you should not be able to put this
> > > command on switching port in the switch, in fact switch won't let you.
> > > But if you program "no switch" on the port, it will be L3 port and if
> > it
> > > has IP it will listen for UDP:123 port (if NTP is globally enabled).
> > So
> > > here comes handy command to disable NTP on this port.
> > >
> > > Andrew
> > >
> > > -----Original Message-----
> > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> > Of
> > > Chris Riling
> > > Sent: Thursday, November 01, 2007 7:42 AM
> > > To: groupstudy
> > > Subject: "NTP disable" interface configuration command
> > >
> > > Anyone know exactly how "ntp disable" works under itnerface config
> > mode?
> > > According to the DocCD: " Disabling NTP Services on a Specific
> > Interface
> > >
> > > NTP services are disabled on all interfaces by default.
> > > NTP is enabled globally when any NTP commands are entered. you can
> > > selectively prevent NTP packets from being received through a specific
> > > interface by using the following command in interface configuration
> > mode
> > > to turn off NTP on a given interface"
> > >
> > > If I do that on a switch for example, does it block ALL NTP traffic on
> > > that interface? Or just the traffic of anything coming in on that port
> > > trying to sync with the switch itself?
> > >
> > > Thanks,
> > > Chris
> > >
> > >
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