I was wondering if anyone had some perspective on the following behavior, as I thought making a switchport an access port with "switchport mode access" would make it statically permanently a non-trunk, thus not enabling DTP on it.
My switch platform is a 3750v2, running code:
System image file is "flash:/c3750-ipservicesk9-mz.150-2.SE9/c3750-ipservicesk9-mz.150-2.SE9.bin"
However for some reason it would add to the "global" dtp interfaces #, as can be seen below:
SW1#sh dtp
Global DTP information
Sending DTP Hello packets every 30 seconds
Dynamic Trunk timeout is 300 seconds
5 interfaces using DTP
SW1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
SW1(config)#int fa1/0/18
SW1(config-if)#switchport mode access
SW1(config-if)#do sh dtp
Global DTP information
Sending DTP Hello packets every 30 seconds
Dynamic Trunk timeout is 300 seconds
6 interfaces using DTP
However when I go to verify the interface has DTP enabled:
SW1(config-if)#do sh int switchport | b Fa1/0/18
Name: Fa1/0/18
Switchport: Enabled
Administrative Mode: static access
Operational Mode: down
Administrative Trunking Encapsulation: negotiate
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
For my last confirmation it is not DTP enabled:
SW1(config-if)#do sh dtp int fa1/0/18 | i Enabled:
Enabled: no
SW1(config-if)#
So I went through "sh int switchport"port by port, and it appears that any Trunk port or non-statically assigned access port shows "Negotation of Trunking" as enabled when the port is completely otherwise unconfigured and no cable is plugged into it so it is not Up/Up or active.
So I am wondering... is there a reason why the ports show they are not negotiating, and that DTP not enabled on the interface, but it adds to the number of global DTP interfaces with "sh dtp"?
Is this a bug possibly? I've read through wikipedia and cisco documentation and cannot find an answer, so any help is greeeeatly appreciated and will get a ***** for a good explanation or link to one :)
Thanks!
