If you change the con?¬?guration of
one of these parameters, the switch propagates the setting that you enter
to all ports in the group. The settings include the following:
??? Allowed VLAN list
??? STP1 path cost for each VLAN
??? STP port priority for each VLAN
??? STP PortFast setting
??? Trunk status; if one port in a port group ceases to be a trunk, all ports
cease to be trunks
Table 2-7 switchport mode Parameters
Parameter Description
trunk Con?¬?gures the port into permanent 802.1Q trunk mode and negotiates with
the connected device to convert the link to trunk mode.
access Disables port trunk mode and negotiates with the connected device to
convert the link to nontrunk.
dynamic
desirable
Triggers the port to negotiate the link from nontrunk to trunk mode. The port
negotiates to a trunk port if the connected device is in trunk state, desirable
state, or auto state. Otherwise, the port becomes a nontrunk port.
dynamic
auto
Enables a port to become a trunk only if the connected device has the state
set to trunk or desirable. Otherwise, the port becomes a nontrunk port.
34 Chapter 2: Medium-Sized Switched Network Construction
The switchport nonegotiate interface command speci?¬?es that DTP negotiation packets are
not sent on the Layer 2 interface.
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