Overview; Chapter 8 Configuring Vlan - Cisco WS-C2955T-12 Software Manual

Overview

Overview
A virtual LAN (VLAN) is a switched network that is logically segmented by function, project team, or
application, without regard to the physical locations of the users. Any switch port can belong to a VLAN,
and unicast, broadcast, and multicast packets are forwarded and flooded only to 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 bridge as shown in
a number of 1 to 1001.
Because a VLAN is considered a separate logical network, it contains its own bridge Management
Information Base (MIB) information and can support its own implementation of the Spanning Tree
Protocol (STP). For information about managing VLAN STP instances, see the
Instances" section on page
Table 8-1
Table 8-1
Switch
Catalyst 2912 XL, Catalyst 2924 XL, and
Catalyst 2924C XL switches
Catalyst 2900 LRE XL switches
Catalyst 2912M and Catalyst 2924M
modular switches
Catalyst 3500 XL switches
Figure 8-1
Cisco router
Catalyst 2900 Series XL and Catalyst 3500 Series XL Software Configuration Guide
8-2
6-33.
lists the number of supported VLANs and STP instances on the switches.
Maximum Number of Supported VLANs
VLANs as Logically Defined Networks
Catalyst 3500
series XL
Catalyst 2900
series XL
Fast
Ethernet
Catalyst 2900
series XL
Maximum Number
of VLANs
64
250
250
250
Engineering Marketing
VLAN VLAN
Chapter 8 Configuring VLANs
Figure 8-1. VLANs are identified with
"Supported STP
Maximum Number
of STP Instances
64
64
64
64
Accounting
VLAN
Floor 3
Floor 2
Floor 1
Trunking
Supported?
Yes
Yes
Yes
Yes
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