Dynamic Trunking Characteristics

DTP characteristics are as follows:

• On by default on Catalyst 2960 and 2950 switches
• Dynamic-auto is default on the 2960 and 2950 switches
• May be turned off with the nonegotiate command
• May be turned back on by setting the interface to dynamic-auto

Dynamic Trunking Protocol (DTP) is a proprietary Cisco protocol

Setting a switch to a static trunk or static access will avoid negotiation issues with the switchport mode trunk or the switchport mode access commands