Cisco Systems EA6500 Manual De Usuario

 lists the Ethernet trunk encapsulation types.

The trunking mode, the trunk encapsulation type, and the hardware capabilities of the two connected 
LAN ports determine whether a link becomes an ISL or 802.1Q trunk.

 lists the Layer 2 LAN port modes and describes how they function on LAN ports. 

switchport trunk encapsulation isl 

Specifies ISL encapsulation on the trunk link.

10-Gigabit Ethernet ports do not support 
ISL encapsulation.

switchport trunk encapsulation dot1q 

Specifies 802.1Q encapsulation on the trunk link.

switchport trunk encapsulation negotiate 

Specifies that the LAN port negotiate with the 
neighboring LAN port to become an ISL 
(preferred) or 802.1Q trunk, depending on the 
configuration and capabilities of the neighboring 
LAN port.

switchport mode 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.

switchport mode 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.

switchport mode 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.

switchport mode 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.

switchport 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.