Configuring VLAN Trunks

How to Configure VLAN Trunks

Feature

Default Setting

VLAN range eligible for pruning

VLANs 2 to 1001

Default VLAN (for access ports)

VLAN 1

Native VLAN (for IEEE 802.1Q trunks)

VLAN 1

How to Configure VLAN Trunks

To avoid trunking misconfigurations, configure interfaces connected to devices that do not support DTP to not forward DTP frames, that is, to turn off DTP.

•If you do not intend to trunk across those links, use the switchport mode access interface configuration command to disable trunking.

•To enable trunking to a device that does not support DTP, use the switchport mode trunk and switchport nonegotiate interface configuration commands to cause the interface to become a trunk but to not generate DTP frames.

Configuring an Ethernet Interface as a Trunk Port

Configuring a Trunk Port

Because trunk ports send and receive VTP advertisements, to use VTP you must ensure that at least one trunk port is configured on the switch and that this trunk port is connected to the trunk port of a second switch. Otherwise, the switch cannot receive any VTP advertisements.

Before You Begin

SUMMARY STEPS

1.configure terminal

2.interface interface-id

3.switchport mode {dynamic {auto desirable} trunk}

4.switchport access vlan vlan-id

5.switchport trunk native vlan vlan-id

6.end

7.show interfaces interface-idswitchport

8.show interfaces interface-idtrunk

9.copy running-config startup-config

Catalyst 2960-XR Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX1

OL-29440-01

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Cisco Systems WSC2960XR48FPSI manual How to Configure Vlan Trunks, Configuring an Ethernet Interface as a Trunk Port
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WSC2960XR48FPSI specifications

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