10-4
Cisco ME 3800X and 3600X Switch Software Configuration Guide
OL-23400-01
Chapter 10 Configuring VLANs
Understanding VLANs
• VLAN number to use when translating from one VLAN type to another
• UNI VLAN configuration
For extended-range VLANs, you can configure only VLAN MTU.
Note This chapter does not provide configuration details for most of these parameters. For complete
information on the commands and parameters that control VLAN configuration, see the command
reference for this release.
Extended-Range VLANs
You can create extended-range VLANs (in the range 1006 to 4094) to enable service providers to extend
their infrastructure to a greater number of customers. The extended-range VLAN IDs are allowed for any
switchport commands that allow VLAN IDs. Extended-range VLAN configurations are not stored in
the VLAN database, but they are stored in the switch running configuration file, and you can save the
configuration in the startup configuration file by using the copy running-config startup-config
privileged EXEC command.
VLAN Port Membership Modes
You configure a port to belong to a VLAN by assigning a membership mode that specifies the kind of
traffic that the port carries and the number of VLANs to which it can belong. Table 10-1 lists the
membership modes and characteristics.
For more detailed definitions of access and trunk modes and their functions, see Table 10-4 on
page 10-10.
When a port belongs to a VLAN, the switch learns and manages the addresses associated with the port
on a per-VLAN basis. For more information, see the “Managing the MAC Address Table” section on
page 5-19.
UNI VLANs
The Cisco ME 3800X and 3600X have commands for configuring user network interface (UNI) VLANs
to isolate traffic between some ports on a switch.
Table 10-1 Port Membership Modes
Membership Mode VLAN Membership Characteristics
Static-access A static-access port can belong to one VLAN and is manually assigned to that VLAN.
For more information, see the “Assigning Static-Access Ports to a VLAN” section on page 10-8.
Trunk (IEEE 802.1Q) A trunk port is a member of all VLANs by default, including extended-range VLANs, but
membership can be limited by configuring the allowed-VLAN list.
For information about configuring trunk ports, see the “Configuring an Ethernet Interface as a
Trunk Port” section on page 10-11.
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