Cisco 3200 Series Hardware Reference Manual page 126

Port-Based VLAN
Figure C-1
LAN1
LAN2
LAN3
Port-Based VLAN
By default, the 10/100 Fast Ethernet interfaces on the FESMIC are defaulted to Layer 2 switch ports and
all four interfaces belong to VLAN 1. You can partition the switch ports to belong to different VLAN
groups by using the switchport vlan access <vlan-id> command. The following is a brief function
description of a FESMIC port-based VLAN:
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Cisco 3200 Series Router Hardware Reference
C-2
Traditional LAN Segmentation versus VLAN Segmentation
Traditional LAN Segmentation
Shared hub
Shared hub
Shared hub
Router
Each VLAN has its own MAC address table.
Packets received are forwarded only to ports that are members of the same VLAN as the receiving
port. VLAN partitions provide hard firewalls for all traffic in different VLANs.
A VLAN comes into existence when a user adds a VLAN to the local VLAN database. A maximum
of 32 VLANs are supported. VLAN IDs can range from 1 to 1005.
By default, a spanning tree instance is created for each VLAN.
Appendix C
Virtual LAN Segmentation
VLAN1
L2 Switch
Floor 3
L2 Switch
Floor 2
Router
Floor 1
L2 Switch
Switch Port Functionality
VLAN2 VLAN3
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