Restrictions for VLANs
Thefollowing arethe restrictionsfor configuringVLANs:
•Theswitch supports homogeneous stacking, but does not support mixed stacking.
Information About VLANs

Logical Networks

AVLAN is a switched network that is logically segmented by function, project team, or application, without
regardto the physical locations of the users. VLANs have the same attributes as physical LANs, but you can
groupend stationseven if they are not physicallylocated on the same LAN segment. Any switch port can
belongto a VLAN, and unicast, broadcast, and multicast packets are forwarded and flooded only to end
stationsin the VLAN. EachVLAN is considered a logical network, andpackets destined for stations that do
notbelong to the VLAN must be forwarded through a router or a switch supporting fallback bridging. In a
switchstack, VLANs can be formed with ports across the stack. Because a VLAN is considered a separate
logicalnetwork, it contains its own bridge Management Information Base (MIB) information and can support
itsown implementationof spanningtree.
Figure 3: VLANs as Logically Defined Networks
VLANsare often associated with IP subnetworks. For example, all the end stations in a particular IP subnet
belongto the same VLAN. Interface VLAN membership on the switch is assigned manually on an
Catalyst 2960-XR Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX1
40 OL-29440-01
Configuring VLANs
Restrictions for VLANs