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7-2
Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR
OL-26895-01
Chapter 7 Configuring VLANs
Understanding VLANs
Figure 7-1 shows an example of VLANs segmented into logically defined networks.
Figure 7-1 VLANs as Logically Defined Networks
VLANs are often associated with IP subnetworks. For example, all the end stations in a particular IP
subnet belong to the same VLAN. Interface VLAN membership on the switch is assigned manually on
an interface-by-interface basis. When you assign switch interfaces to VLANs by using this method, it is
known as interface-based, or static, VLAN membership.
Traffic between VLANs must be routed. Switches that are running the metro IP access image can route
traffic between VLANs by using switch virtual interfaces (SVIs). To route traffic between VLANs, an
SVI must be explicitly configured and assigned an IP address. For more information, see the Interface
and Hardware Component Configuration Guide, Cisco IOS Release 15.0S..
This section includes these topics:
• Supported VLANs, page 7-2
• Normal-Range VLANs, page 7-3
• Extended-Range VLANs, page 7-4
• VLAN Port Membership Modes, page 7-4
Supported VLANs
VLANs are identified with a number from 1 to 4094. VLAN IDs 1002 through 1005 are reserved for
Token Ring and FDDI VLANs. VLAN IDs greater than 1005 are extended-range VLANs and are not
stored in the VLAN database.
Although the router supports a total of 1005 (normal-range and extended-range) VLANs, the number of
routed ports, SVIs, and other configured features affects the use of the switch hardware.