Switchport Trunk - Cisco Catalyst 3550 Command Reference Manual
Multilayer switch
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switchport trunk
switchport trunk
Use the switchport trunk interface configuration command to set the trunk characteristics when the
interface is in trunking mode. Use the no form of this command to reset a trunking characteristic to the
default.
Syntax Description
allowed vlan vlan-list
encapsulation dot1q
encapsulation isl
encapsulation
negotiate
native vlan vlan-id
pruning vlan vlan-list
The vlan-list format is all | none | [add | remove | except] vlan-atom [,vlan-atom...] where:
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Catalyst 3550 Multilayer Switch Command Reference
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switchport trunk {allowed vlan vlan-list} | {encapsulation {dot1q | isl | negotiate}} |
{native vlan vlan-id} | {pruning vlan vlan-list}
no switchport trunk {allowed vlan vlan-list} | {encapsulation {dot1q | isl | negotiate}} |
{native vlan vlan-id} | {pruning vlan vlan-list}
Set the list of allowed VLANs that can receive and send traffic on this
interface in tagged format when in trunking mode. See the following vlan-list
format. The none keyword is not valid. The default is all.
Set the encapsulation format on the trunk port to IEEE 802.1Q. With this
format, the switch supports simultaneous tagged and untagged traffic on a
port.
Set the encapsulation format on the trunk port to Inter-Switch Link (ISL).
The switch encapsulates all received and sent packets with an ISL header and
filters native frames received from an ISL trunk port.
Specify that if Dynamic Inter-Switch Link (DISL) and Dynamic Trunking
Protocol (DTP) negotiation do not resolve the encapsulation format, ISL is
the selected format.
Set the native VLAN for sending and receiving untagged traffic when the
interface is in IEEE 802.1Q trunking mode. The range is 1 to 4094.
Set the list of VLANs that are eligible for VTP pruning when in trunking
mode. The all keyword is not valid.
all specifies all VLANs from 1 to 4094. This keyword is not allowed on commands that do not
permit all VLANs in the list to be set at the same time.
none means an empty list. This keyword is not allowed on commands that require certain VLANs
to be set or at least one VLAN to be set.
add adds the defined list of VLANs to those currently set instead of replacing the list. The range is
1 to 1005; extended-range VLANs (VLAN IDs greater than 1005) are valid in some cases.
Note
You can add extended-range VLANs to the allowed VLAN list, but not to the
pruning-eligible VLAN list.
Separate nonconsecutive VLAN IDs with a comma; use a hyphen to designate a range of
IDs.remove removes the defined list of VLANs from those currently set instead of replacing the list.
The range is 1 to 1005; extended-range VLAN IDs are valid in some cases.
You can remove extended-range VLANs from the allowed VLAN list, but you cannot
Note
remove them from the pruning-eligible list.
Chapter 2 Catalyst 3550 Switch Cisco IOS Commands
OL-8566-01
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