From: Chris Riling (criling@gmail.com)
Date: Fri Nov 02 2007 - 01:01:46 ART
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
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> The content contained in this electronic message is not intended to
> constitute formation of a contract binding TWTC. TWTC will be
> contractually bound only upon execution, by an authorized officer, of
> a contract including agreed terms and conditions or by express
> application of its tariffs.
>
> This message is intended only for the use of the individual or entity
> to which it is addressed. If the reader of this message is not the
> intended recipient, or the employee or agent responsible for
> delivering the message to the intended recipient, you are hereby
> notified that any dissemination, distribution or copying of this
> message is strictly prohibited. If you have received this
> communication in error, please notify us immediately by replying to
> the sender of this E-Mail or by telephone.
This archive was generated by hypermail 2.1.4 : Sat Dec 01 2007 - 06:37:27 ART