Cisco 2950 - Catalyst Switch Dokumentacja Pobierz pdf (Strona 530)

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Catalyst 2950 and Catalyst 2955 Switch Command Reference

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Chapter 2 Catalyst 2950 and 2955 Cisco IOS Commands

switchport trunk

• If a packet has a VLAN ID that is the same as the sending port native VLAN ID, the packet is sent

without a tag; otherwise, the switch sends the packet with a tag.

• The no form of the native vlan command resets the native mode VLAN to the appropriate default

VLAN for the device.

Trunk Pruning:

• The pruning-eligible list applies only to trunk ports.

• Each trunk port has its own eligibility list.

• If you do not want a VLAN to be pruned, remove it from the pruning-eligible list. VLANs that are

pruning-ineligible receive flooded traffic.

• VLAN 1, VLANs 1002 to 1005, and extended-range VLANs (VLANs 1006 to 4094) cannot be

pruned.

Note The switch does not support Inter-Switch Link (ISL) trunking.

Examples This example shows how to configure VLAN 3 as the default port to send all untagged traffic:

Switch(config-if)# switchport trunk native vlan 3

This example shows how to add VLANs 1, 2, 5, and 6 to the allowed list:

Switch(config-if)# switchport trunk allowed vlan add 1,2,5,6

This example shows how to remove VLANs 3 and 10 to 15 from the pruning-eligible list:

Switch(config-if)# switchport trunk pruning vlan remove 3,10-15

You can verify your settings by entering the show interfaces interface-id switchport privileged EXEC

command.

Related Commands Command Description

show interfaces switchport Displays the administrative and operational status of a switching

(nonrouting) port.

switchport mode Configures the VLAN membership mode of a port.

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