This are few method which enable DTP ( dyanamic trunking protocol) ,
If the access keyword is specified, then the interface is configured as an access port and trunking is disabled, which is equivalent to the DTP mode of off. If the dynamic keyword is specified, a DTP mode of auto or desirable can be selected by configuring the appropriate keyword. By default, all interfaces are configured to operate in a DTP mode of desirable, i.e., switchport mode dynamic desirable. Finally, if the trunk keyword is specified, this forces the interface to trunk unconditionally, which is equivalent to a DTP mode of on. If the trunk keyword is specified, you can also optionally use the switchport nonegotiate interface configuration command to force the DTP mode for the interface to nonegotiate.
Please refer attached document for more information, rate this if this helpful
3361-Scenario 3-2 Configuring Trunking Between Switches.mht
switcport mode access - only on VLAN is supported over this port
switcport mode trunk - set the port to trunk in static mode, there is no communication between the switch like in dynamic mode. Over trunk you can transfer multiple VLANs traffic.
switcport mode dynamic desirable - dynamic mode can the switch communicate with other end about the port role - functional as trunk or access - desirable start the conversation (it's kind of master in the communication), if the other end is desirable or auto trunk will be formed anyway no
switcport mode dynamic auto - te switchport just wait for the incoming DTP (dynamic trunking protocol) messages, since of this two port in auto mode never form trunk.
switchport mode trunk - switchport mode trunk
......................- switchport mode dynamic auto
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