Restrictions For Vlans; Information About Vlans; Logical Networks - Cisco Catalyst 2960 series Configuration Manual

Restrictions for VLANs

• The switch supports homogeneous stacking and mixed stacking. Mixed stacking is supported only with

Restrictions for VLANs

The following are restrictions for configuring VLANs:
• 1K VLAN is supported only on switches running the LAN Base image with the lanbase-default template
• To avoid warning messages of high CPU utilization with a normal-range VLAN configuration, we
• Private VLANs are not supported on the switch.

Information About VLANs

Logical Networks

A VLAN is a switched network that is logically segmented by function, project team, or application, without
regard to the physical locations of the users. VLANs have the same attributes as physical LANs, but you can
group end stations even if they are not physically located on the same LAN segment. Any switch port can
belong to a VLAN, and unicast, broadcast, and multicast packets are forwarded and flooded only to end
stations in the VLAN. Each VLAN is considered a logical network, and packets destined for stations that do
not belong to the VLAN must be forwarded through a router or a switch supporting fallback bridging. In a
switch stack, VLANs can be formed with ports across the stack. Because a VLAN is considered a separate
Catalyst 2960-X Switch VLAN Configuration Guide, Cisco IOS Release 15.0(2)EX
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On using the LAN Base image, only the lanbase-default template supports 1000 VLANs.
Note
The remaining templates (default and lanbase-routing) only supports 255 VLANs. Up
to 64 VLANs are supported when the switch is running the LAN Lite image.
the Catalyst 2960-S switches. A homogenous stack can have up to eight stack members, while a mixed
stack can have up to four stack members. All switches in a switch stack must be running the LAN Base
image.
set.
recommend that you have no more than 256 VLANs. In such cases, approximately 10 access interfaces
or 5 trunk interfaces can flap simultaneously with negligible impact to CPU utilization (if there are more
interfaces that flap simultaneously, then CPU usage may be excessively high.)
Configuring VLANs
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