Specifications

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR
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Chapter 7 Configuring VLANs
Understanding VLANs
• VLAN number to use when translating from one VLAN type to another
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.
Note Although the switch supports 4094 VLAN IDs, the actual number of VLANs supported is 1005.
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 7-1 lists the
membership modes and characteristics.
For more detailed definitions of access and trunk modes and their functions, see Table 7-4 on page 7-12.
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 Chapter 12, “Managing the MAC Address Table.”.
Table 7-1 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 7-8.
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 7-13.
Tunnel
(dot1q-tunnel)
Tunnel ports are used for IEEE 802.1Q tunneling to maintain customer VLAN integrity across a
service-provider network. You configure a tunnel port on an edge switch in the service-provider
network and connect it to an IEEE 802.1Q trunk port on a customer interface, creating an
assymetric link. A tunnel port belongs to a single VLAN that is dedicated to tunneling.
For more information about tunnel ports, see Chapter 8, “Configuring IEEE 802.1Q Tunneling
and Layer 2 Protocol Tunneling.”