From: Anthony Sequeira (terry.francona@gmail.com)
Date: Sun May 22 2005 - 12:01:56 GMT-3
Upon further investigation - there is no need for switchport
nonegotiate on an access port (switch mode access) because it appears
that negotiation turns off anyways!
So even though the IOS lets you input the command - you are wasting time.
Rack1SW1#show run int gi0/9
Building configuration...
Current configuration : 75 bytes
!
interface GigabitEthernet0/9
switchport mode access
no ip address
end
Rack1SW1#show int gi0/9 switchport
Name: Gi0/9
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: negotiate
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
On 5/22/05, Anthony Sequeira <terry.francona@gmail.com> wrote:
> You can indeed use the switchport nonegotiate command in conjunction
> with switchport mode access. Here is the show int switchport output
> that results as well as a look at the configuration on the port.
> Notice that negotiation of trunking is no longer operational! Kind of
> interesting since you have told the port that it can NEVER be a trunk
> anyways!
>
> So in summation - it looks like if you want to prevent DTP activities
> on a port - use switchport nonegotiate.
>
> NOTE: You cannot use the switchport nonegotiate command in conjunction
> with switchport dynamic - and this should make perfect sense! The
> switch gets a bit confused when you say - let's use DTP - AND let's
> NOT use DTP!
>
> show run int gi0/9
> Building configuration...
>
> Current configuration : 99 bytes
> !
> interface GigabitEthernet0/9
> switchport mode access
> switchport nonegotiate
> no ip address
> end
>
> Rack1SW1#show int gi0/9 switch
> Name: Gi0/9
> Switchport: Enabled
> Administrative Mode: static access
> Operational Mode: static access
> Administrative Trunking Encapsulation: negotiate
> Operational Trunking Encapsulation: native
> Negotiation of Trunking: Off
> ...
>
>
> On 5/21/05, B Kim <beokim@comcast.net> wrote:
> > Hi,
> >
> > I think that even in access mode, DTP is running unless it is explicitly
> > disabled. Hope someone can verify this, if incorrect.
> >
> > BKim
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > Wang, Ting (Taylor)
> > Sent: Saturday, May 21, 2005 9:02 PM
> > To: ccielab@groupstudy.com
> > Subject: RE: DTP
> >
> > Hi ,
> > I 'm not sure if only use " sw mode access" can work. In access mode,
> > how will DTP work?
> > Taylor
> >
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of B
> > Kim
> > Sent: 2005?5?22? 7:51
> > To: sumit.kumar@comcast.net; ccielab@groupstudy.com
> > Subject: RE: DTP
> >
> >
> > Hi
> >
> > As far as I know, the "switch nonegotiate" is the only way to disable
> > DTP between switch ports.
> >
> > Rgds.
> >
> > -----Original Message-----
> > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> > sumit.kumar@comcast.net
> > Sent: Saturday, May 21, 2005 6:32 PM
> > To: ccielab@groupstudy.com
> > Subject: DTP
> >
> > Mates,
> >
> > I have seen a lot of threads on this but for final verification to -
> > Disable DTP completely on the switch - the best bet is to use
> > "switchport nonnegotiate " on all trunk ports or there's any othr way of
> > doing it?
> >
> > thanks !!
> >
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