Cisco Systems ME3400G2CSA Default Layer 2 Ethernet Interface VLAN Configuration, Configuring an Ethernet Interface as a Trunk Port

11-16

Cisco ME 3400 EthernetAccess Switch SoftwareConfiguration Guide

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Chapter11 Configuring VLANs

Configuring VLAN Trunks

Default Layer 2 Ethernet Interface VLAN Configuration

Table11-5 shows the de fault Lay er 2 E t herne t i nte rface V LAN co nfigurat ion.

Configuring an Ethernet Interface as a Trunk Port

These sections contain this configuration information about trunk ports:

•Interaction with Other Features, page 11-16

•Defining the Allowed VLANs on a Trunk, page 11-17

•Configuring the Native VLAN for Untagged Traffic, page 11-19

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 co nfiguration of one of these parameters, the switch

propagates the setting that you entered to all ports in the grou p:

–

allowed-VLAN list.

–

STP port priority for each VLAN (NNIs only).

–

STP Port Fast setting (NNIs only).

–

trunk status: if one port in a port group ceases to b e a t runk, a ll por t s ce ase t o be t runk s.

•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 po rt mode is

not changed.

Table11-5 Default Layer 2 Ethernet Interface VLAN Configuration

Feature Default Setting

Interface mode switchport mode access

Allowed VLAN range VLANs 1 to 4094

Default VLAN (for access ports) VLAN 1

Native VLAN (for IEEE 802.1Q trunks) VLAN 1