This protocol is used to negotiate trunk links between VLAN aware switches using dot1q or isl. The negotiation process will also determine which trunking protocol is used either dot1q or isl. By default no trunking protocol is configured on either end. ISL is configured if supported by each switch.
DTP advertieses VTP domain, the status of the interface and its DTP type. These packets are transmitted on the native VLAN every 60 seconds.
DTP should not be confused with VTP, as they serve different purposes. VTP communicates VLAN existence information between switches. DTP aids with trunk port establishment. Neither protocol transmits the data frames that trunks carry.
The following switch port mode settings exist:
Access — Puts the LAN port into permanent nontrunking mode and negotiates to convert the link into a nontrunk link. The LAN port becomes a nontrunk port even if the neighboring LAN port does not agree to the change.
CLI command: switchport mode access
Trunk — Puts the LAN port into permanent trunking mode and negotiates to convert the link into a trunk link. The LAN port becomes a trunk port even if the neighboring port does not agree to the change.
CLI command: switchport mode trunk
Dynamic Auto — Makes the LAN port willing to convert the link to a trunk link. The LAN port becomes a trunk port if the neighboring LAN port is set to trunk or desirable mode.
CLI command: switchport mode dynamic auto
Dynamic Desirable — Makes the LAN port actively attempt to convert the link to a trunk link. The LAN port becomes a trunk port if the neighboring LAN port is set to trunk, desirable, or auto mode. This is the default mode for all LAN ports.
CLI command: switchport mode dynamic desirable
Nonegotiate — Puts the LAN port into permanent trunking mode but prevents the port from generating DTP frames. You must configure the neighboring port manually as a trunk port to establish a trunk link.
CLI command: switchport mode nonegotiate
DTP advertieses VTP domain, the status of the interface and its DTP type. These packets are transmitted on the native VLAN every 60 seconds.
DTP should not be confused with VTP, as they serve different purposes. VTP communicates VLAN existence information between switches. DTP aids with trunk port establishment. Neither protocol transmits the data frames that trunks carry.
The following switch port mode settings exist:
Access — Puts the LAN port into permanent nontrunking mode and negotiates to convert the link into a nontrunk link. The LAN port becomes a nontrunk port even if the neighboring LAN port does not agree to the change.
CLI command: switchport mode access
Trunk — Puts the LAN port into permanent trunking mode and negotiates to convert the link into a trunk link. The LAN port becomes a trunk port even if the neighboring port does not agree to the change.
CLI command: switchport mode trunk
Dynamic Auto — Makes the LAN port willing to convert the link to a trunk link. The LAN port becomes a trunk port if the neighboring LAN port is set to trunk or desirable mode.
CLI command: switchport mode dynamic auto
Dynamic Desirable — Makes the LAN port actively attempt to convert the link to a trunk link. The LAN port becomes a trunk port if the neighboring LAN port is set to trunk, desirable, or auto mode. This is the default mode for all LAN ports.
CLI command: switchport mode dynamic desirable
Nonegotiate — Puts the LAN port into permanent trunking mode but prevents the port from generating DTP frames. You must configure the neighboring port manually as a trunk port to establish a trunk link.
CLI command: switchport mode nonegotiate
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