Re: "switchport nonegotiate" & DTP traffic

From: The Great Ryan (pv.ryan@gmail.com)
Date: Sat Oct 22 2005 - 02:55:34 GMT-3


Yes, I found that when I put an interface port into access mode (i.e.
switchport mode access), it will not negotiate to become trunk (i.e.
no DTP to send).

Is it not necessary to put "switchport nonegotiate" on access port ?

i.e.
interface FastEthernet0/25
 switchport mode access
 switchport nonegotiate <-- useless/no need

However, I found from Cisco Documentation that "switchport
nonegotiate" is valid when the interface switchport mode is access or
trunk.

It said that it is VALID. But In the point of my view, it is useless
when the interface switchport mod is access.

Correct me if I have mistake on that. Thanks !

Ryan

2005/10/22, CCIEBOB <cciebob@comcast.net>:
> Also using the "show dtp interface X" command.
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Thomwin Chen
> Sent: Friday, October 21, 2005 11:22 AM
> To: The Great Ryan; Cisco certification
> Subject: Re: "switchport nonegotiate" & DTP traffic
>
> Hi Ryan,
>
> you can verify this using switchport int fa0/x switchport
>
> you should see something like this :
>
> Negotiation of trunking : On or Off
>
> Example :
>
> <before hardcoded to static access>
>
> 3550#show int fa0/5 swi
> Name: Fa0/5
> ....
> Negotiation of Trunking: On
> Access Mode VLAN: 1 (default)
> ....
> 3550#conf t
> Enter configuration commands, one per line. End with CNTL/Z.
>
> <after hardcoded to static access>
>
> 3550(config)#int fa0/5
> 3550(config-if)#swi
> 3550(config-if)#switchport mode acc
> 3550(config-if)#do show int fa0/5 swi
> Name: Fa0/5
> ....
> Negotiation of Trunking: Off
> Access Mode VLAN: 1 (default)
> ....
>
> 3550(config-if)#
>
> Rgds,
> Thomwin
>
> The Great Ryan <pv.ryan@gmail.com> wrote:
> Hi, Group,
>
> it is not difficult to understand that "switchport nonegotiate" is
> used to disable DTP traffic when the interface port is in trunk mode.
> However, I found from Cisco Documentation that "switchport
> nonegotiate" is valid when the interface switchport mode is access or
> trunk.
>
> As DTP is used to negotiate interfaces to become trunk, what is the
> use of "switchport nonegotiate" when I already hardcode the interface
> to become access port. Is DTP still being sent even when the interface
> port is in access port?
>
> i.e.
> Rack2R7#s run int f0/25
> Building configuration...
>
> Current configuration : 82 bytes
> !
> interface FastEthernet0/25
> switchport mode access
> switchport nonegotiate
> end
>
>
>
> Ryan
>
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