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Understanding VLANs
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For extended-range VLANs, you can configure only MTU, private VLAN, remote SPAN VLAN, and
UNI VLAN parameters.
This chapter does not provide configuration details for most of these parameters. For complete
Note
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.
Although the switch supports 4094 VLAN IDs, the actual number of VLANs supported is 1005.
Note
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.
membership modes and characteristics.
Table 11-1
Port Membership Modes
Membership Mode
Static-access
Trunk (IEEE 802.1Q)
Cisco ME 3400 Ethernet Access Switch Software Configuration Guide
11-4
Ring number for FDDI and TrCRF VLANs
Parent VLAN number for TrCRF VLANs
Spanning Tree Protocol (STP) type for TrCRF VLANs
VLAN number to use when translating from one VLAN type to another
Private VLAN. Configure the VLAN as a primary or secondary private VLAN. For information
about private VLANs, see
Remote SPAN VLAN. Configure the VLAN as the Remote Switched Port Analyzer (RSPAN)
VLAN for a remote SPAN session. For more information on remote SPAN, see
"Configuring SPAN and RSPAN."
UNI VLAN configuration
VLAN Membership Characteristics
A static-access port can belong to one VLAN and is manually assigned to that VLAN.
For more information, see the
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
Trunk Port" section on page
Chapter 12, "Configuring Private VLANs."
"Assigning Static-Access Ports to a VLAN" section on page
11-16.
Chapter 11
Chapter 24,
Table 11-1
"Configuring an Ethernet Interface as a
Configuring VLANs
lists the
11-10.
78-17058-01
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