CLI ReferenceInterface Configuration Commands Interface Configuration Commands
switchport trunk
Use this command to assign a native VLAN and the allowed-VLAN list for the trunk
port. Add no in the command to restore it to the default setting.
switchport trunk {allowed vlan {all | [add | remove | except] vlan-list }| native
vlan vlan-id}
no switchport trunk {allowed vlan | native vlan}
Configure the list of VLANs allowed on the trunk port. Vlan-list
can be a VLAN or a range of VLANs starting with the smaller
VLAN ID and ending with the larger VLAN ID that are
separated by hyphens; for example, 10 to 20. The segments
can be separated by a comma (,), for example, 1 to 10, 20 to
25, 30, and 33.
all: The allowed VLAN list contains all supported VLANs;
add: adds a specified VLAN list to the allowed VLAN list;
remove: removes a specified VLAN list from the allowed VLAN
list;
except: adds all the VLANs other than those in the specified
VLAN list to the allowed VLAN list;
The allowed VLAN list is all, the Native VLAN is VLAN1.
Interface configuration mode.
Native VLAN:
A Trunk port belongs to one native VLAN. Untagged packets that are received or
sent on the trunk port belong to the VLAN. Obviously, the default VLAN ID of the
interface (that is, the PVID in the IEEE 802.1Q) is the VLAN ID of the native VLAN.
In addition, when frames within the native VLAN are sent over the trunk port, they
are untagged.
Allowed-VLAN List:
By default, a trunk port receives and sends traffic from or to all VLANs (ID 1 to
4094). However, you can prevent the traffic from passing through the trunk by
configuring allowed VLAN lists.
Use show interfaces switchport to display configuration.
The example below removes port 1/15 from VLAN 2:
Ruijie(config)# interface fastethernet 1/15
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