Cisco 3020 - Cisco Catalyst Blade Switch Specifications download pdf (Page 540)

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Cisco Catalyst Blade Switch for HP Command Reference

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Chapter 2 Cisco Catalyst Blade Switch 3020 for HP Cisco IOS Commands

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.

switchport trunk {allowed vlan vlan-list | encapsulation {dot1q | isl | negotiate} | native vlan

vlan-id | pruning vlan vlan-list}

no switchport trunk {allowed vlan | encapsulation | native vlan | {pruning vlan}

Syntax Description

The vlan-list format is all | none | [add | remove | except] vlan-atom [,vlan-atom...] where:

• 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. Valid IDs are

from 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.

Valid IDs are from 1 to 1005; extended-range VLAN IDs are valid in some cases.

Note You can remove extended-range VLANs from the allowed VLAN list, but you cannot

remove them from the pruning-eligible list.

allowed 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.

encapsulation dot1q 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.

encapsulation isl 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.

encapsulation

negotiate

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.

native vlan vlan-id 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.

pruning vlan vlan-list Set the list of VLANs that are eligible for VTP pruning when in trunking

mode. The all keyword is not valid.

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