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Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
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Chapter 11 Configuring VLANs
Configuring VLAN Trunks
Default Layer 2 Ethernet Interface VLAN Configuration
Table 11-5 shows the default Layer 2 Ethernet interface VLAN configuration.
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
• Configuring the Native VLAN for Untagged Traffic, page 11-19
Interaction with Other Features
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 (NNIs only).
–
STP Port Fast setting (NNIs only).
–
trunk status: if one port in a port group ceases to be a trunk, all ports cease to be trunks.
• 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.
Table 11-5 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
