From: Roy Dempsey (roy.dempsey@gmail.com)
Date: Wed Mar 02 2005 - 16:10:03 GMT-3
Hi,
I didn't read about this command anywhere, just found it by chance
when looking for a way to verify that DTP was turned off.
However, I haven't found it to be useful in any way. When used with
arguments it's cryptic. When used without arguments on my 3550, it
tells me that DTP is running, when I'm pretty sure its not running in
any way. I think Chuck may well be right about it being a bug, but
until I can investigate further, I'm going to avoid it.
Roy
On Wed, 2 Mar 2005 13:53:11 -0500, ccie2be <ccie2be@nyc.rr.com> wrote:
> Thanks Marvin,
>
> It's too bad the CR doesn't give any explanations for the output of the
> command. It might be useful to know what some of that stuff below means.
>
> Switch# show dtp interface gigabitethernet0/1
> DTP information for GigabitEthernet0/1:
> TOS/TAS/TNS: ACCESS/AUTO/ACCESS
> TOT/TAT/TNT: NATIVE/NEGOTIATE/NATIVE
> Neighbor address 1: 000943A7D081
> Neighbor address 2: 000000000000
> Hello timer expiration (sec/state): 1/RUNNING
> Access timer expiration (sec/state): never/STOPPED
> Negotiation timer expiration (sec/state): never/STOPPED
> Multidrop timer expiration (sec/state): never/STOPPED
> FSM state: S2:ACCESS
> # times multi & trunk 0
> Enabled: yes
> In STP: no
>
> Statistics
> ----------
> 3160 packets received (3160 good)
> 0 packets dropped
> 0 nonegotiate, 0 bad version, 0 domain mismatches, 0 bad TLVs, 0 other
> 6320 packets output (6320 good)
> 3160 native, 3160 software encap isl, 0 isl hardware native
> 0 output errors
> 0 trunk timeouts
> 1 link ups, last link up on Mon Mar 01 1993, 01:02:29
> 0 link downs
>
> I assume this line means DTP is enabled on this interface:
>
> TOT/TAT/TNT: NATIVE/NEGOTIATE/NATIVE
>
> Would you agree?
>
> Even so, I have no clue what TOT/TAT/TNT means except that TNT is a type of
> explosive used in car bombings and sometimes in construction. <shrug>
>
> Tim
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> marvin greenlee
> Sent: Wednesday, March 02, 2005 12:37 PM
> To: 'ccie2be'; Cisco certification
> Subject: RE: show dtp [bcc][faked-from][bayes]
>
> There is a basic explanation in the 2970 command reference.
>
> Cisco - 2970 Command Reference - show dtp -
> http://www.cisco.com/en/US/products/hw/switches/ps5206/products_command_refe
> rence_chapter09186a00801ce237.html#3135676
>
> Marvin Greenlee, CCIE#12237, CCSI# 30483
> Network Learning Inc
> marvin@ccbootcamp.com
> www.ccbootcamp.com (Cisco Training)
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> ccie2be
> Sent: Wednesday, March 02, 2005 9:26 AM
> To: Roy Dempsey; Cisco certification
> Subject: RE: show dtp [bcc][faked-from][bayes]
> Importance: Low
>
> Hi Roy,
>
> Until your post, I had never heard of the show dtp command and there were a
>
> few times this command would have been very useful to know about.
>
> I looked it up in the 3550 Command Reference and it's not there.
>
> But, a quick check on a 3550 proves that this command does, indeed, exist.
>
> Did you just happen upon this command by doing a show ? or did you learn
>
> about this command another way?
>
> I also see that an interface can be specified with this command but I
>
> couldn't make much sense of much of the output. If this command is
>
> documented somewhere, could you post a link?
>
> TIA, Tim
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Roy
> Dempsey
> Sent: Wednesday, March 02, 2005 10:44 AM
> To: Cisco certification
> Subject: disable dtp globally?
>
> Hi,
>
> I'm trying to disable DTP from running on my switches completely. I
> have run switchport nonegotiate, but still get this under show dtp:
>
> Global DTP information
> Sending DTP Hello packets every 30 seconds
> Dynamic Trunk timeout is 300 seconds
> 24 interfaces using DTP
>
> Looks like its still enabled globally. I've even run switchport host,
> same difference...
> However, on the other side of my trunk links I don't see any DTP
> packets, so it looks like its not running, at least on that link.
> Debug DTP doesn't produce any hello packets every 30 seconds. Looks
> like the message above it plain wrong?
>
> Thanks again
> Roy
>
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