But according to the DOC CD (Thanks JAY ! :D )
Mode Function *switchport mode access* *Puts the interface (access port) into permanent nontrunking mode **and negotiates to convert the link into a nontrunk link. *The interface becomes a nontrunk interface regardless of whether or not the neighboring interface is a trunk interface. *switchport mode dynamic auto* Makes the interface able to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to *trunk* or *desirable* mode. The default switchport mode for all Ethernet interfaces is *dynamic auto*. *switchport mode dynamic desirable* Makes the interface actively attempt to convert the link to a trunk link. The interface becomes a trunk interface if the neighboring interface is set to *trunk*, *desirable*, or *auto* mode. *switchport mode trunk* Puts the interface into permanent trunking mode and negotiates to convert the neighboring link into a trunk link. The interface becomes a trunk interface even if the neighboring interface is not a trunk interface. *switchport nonegotiate* ** *Prevents the interface from generating DTP frames. You can use this command only when the interface switchport mode is access or trunk. You must manually configure the neighboring interface as a trunk interface to establish a trunk link.* *switchport mode dot1q-tunnel* Configures the interface as a tunnel (nontrunking) port to be connected in an asymmetric link with an IEEE 802.1Q trunk port. The IEEE 802.1Q tunneling is used to maintain customer VLAN integrity across a service provider network. See Chapter 16, "Configuring IEEE 802.1Q and Layer 2 Protocol Tunneling,"<http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_55_se/configuration/guide/swtunnel.html#wpxref19505> for more information on tunnel ports 2011/1/18 Nicolas MICHEL <[email protected]> > > Hey there. > > > DTP is such an easy protocol . There are only few commands to enable or > disable it. > I've been reading so much crap about this since my CCNA on cisco forums > that I d like to discuss about it with you guys. > > > Some people says that DTP can only be shutted with the command switchport > nonegotiage. > Some people says that DTP can only be shutted with the command switchport > mode access .... > > > I disagree and I noticed that switchport mode access did indeed shut the > DTP process .... > > Rack1SW1(config-if)#do sh int fa0/21 sw > Name: Fa0/21 > Switchport: Enabled > Administrative Mode: static access > Operational Mode: static access > Administrative Trunking Encapsulation: dot1q > Operational Trunking Encapsulation: native > *Negotiation of Trunking: Off* > Access Mode VLAN: 1 (default) > Trunking Native Mode VLAN: 146 (VLAN0146) > Administrative Native VLAN tagging: enabled > Voice VLAN: none > Administrative private-vlan host-association: none > Administrative private-vlan mapping: none > Administrative private-vlan trunk native VLAN: none > Administrative private-vlan trunk Native VLAN tagging: enabled > Administrative private-vlan trunk encapsulation: dot1q > Administrative private-vlan trunk normal VLANs: none > Administrative private-vlan trunk associations: none > Administrative private-vlan trunk mappings: none > Operational private-vlan: none > Trunking VLANs Enabled: ALL > Pruning VLANs Enabled: 2-1001 > Capture Mode Disabled > > > > So what do you guys think about this newbie question ? :) > > > -- > Nicolas MICHEL > Ingenieur Réseaux et Securité (CCNA/CCNP) > > > > > -- Nicolas MICHEL Ingenieur Réseaux et Securité (CCNA/CCNP) _______________________________________________ For more information regarding industry leading CCIE Lab training, please visit www.ipexpert.com
