Appendix C Switch Port Functionality

Port-Based VLAN

Figure C-1 Traditional LAN Segmentation versus VLAN Segmentation

Traditional LAN Segmentation

Virtual LAN Segmentation

VLAN1 VLAN2 VLAN3

Shared hub

LAN1

Shared hub

LAN2

Shared hub

LAN3

Router

L2 Switch

Floor 3

L2 Switch

Floor 2

Router

Floor 1

L2 Switch

82632

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:

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.

Cisco 3200 Series Router Hardware Reference

 

C-2

OL-5816-10

 

 

 

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Cisco Systems 3200 manual Port-Based Vlan, Traditional LAN Segmentation Virtual LAN Segmentation

3200 specifications

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