Configuring VLAN Trunks

Feature Interactions

Feature Interactions

Trunking interacts with other features in these ways:

A trunk port cannot be a secure port.

A trunk port cannot be a tunnel port.

Trunk ports can be grouped into EtherChannel port groups, but all trunks in the group must have the same configuration. When a group is first created, all ports follow the parameters set for the first port to be added to the group. If you change the configuration of one of these parameters, the switch propagates the setting that you entered to all ports in the group:

Allowed-VLAN list.

STP port priority for each VLAN.

STP Port Fast setting.

Trunk status:

If one port in a port group ceases to be a trunk, all ports cease to be trunks.

We recommend that you configure no more than 24 trunk ports in Per VLAN Spanning Tree (PVST) mode and no more than 40 trunk ports in Multiple Spanning Tree (MST) mode.

If you try to enable IEEE 802.1x on a trunk port, an error message appears, and IEEE 802.1x is not enabled. If you try to change the mode of an IEEE 802.1x-enabled port to trunk, the port mode is not changed.

A port in dynamic mode can negotiate with its neighbor to become a trunk port. If you try to enable IEEE 802.1x on a dynamic port, an error message appears, and IEEE 802.1x is not enabled. If you try to change the mode of an IEEE 802.1x-enabled port to dynamic, the port mode is not changed.

Related Topics

Configuring a Trunk Port, on page 67

Example: Configuring an IEEE 802.1Q Trunk, on page 80

Default Layer 2 Ethernet Interface VLAN Configuration

The following table shows the default Layer 2 Ethernet interface VLAN configuration.

Table 11: Default Layer 2 Ethernet Interface VLAN Configuration

Feature

Default Setting

Interface mode

switchport mode dynamic auto

Trunk encapsulation

switchport trunk encapsulation negotiate

Allowed VLAN range

VLANs 1 to 4094

 

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Cisco Systems WSC2960XR48FPSI manual Feature Interactions, Default Layer 2 Ethernet Interface Vlan Configuration

WSC2960XR48FPSI specifications

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