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Download free Configuring InterVLAN Routing with Catalyst 3750/3560/3550 Series Switches.pdf This document explains how to configure interVLAN routing with Cisco Catalyst 3750/3560/3550 series switches. The document provides a sample configuration for interVLAN routing with a Catalyst 3550 series switch that runs enhanced multilayer image (EMI) software in a typical network scenario. The document uses a Catalyst 2950 series switch and a Catalyst 2948G switch as Layer 2 (L2) closet switches that connect to the Catalyst 3550. The Catalyst 3550 configuration also has a default route for all traffic that goes to the Internet when the next hop points to a Cisco 7200VXR router. You can substitute a firewall or other routers for the Cisco 7200VXR router.In a switched network, VLANs separate devices into different collision domains and Layer 3 (L3) subnets. Devices within a VLAN can communicate with each other without the need for routing. Devices in separate VLANs require a routing device to communicate with one another.L2−only switches require an L3 routing device. The device is either external to the switch or in another module on the same chassis. A new breed of switches incorporate routing capability within the switch. An example is the 3550. The switch receives a packet, determines that the packet belongs to another VLAN, and sends the packet to the appropriate port on the other VLAN.A typical network design segments the network based on the group or function to which the device belongs. For example, the engineering VLAN only has devices that relate to the engineering department, and the finance VLAN only has devices that relate to finance. If you enable routing, the devices in each VLAN can talk to one another without the need for all the devices to be in the same broadcast domain. Such a VLAN design also has an additional benefit. The design allows the administrator to restrict communication between VLANs with use of access lists. In the example in this document, you can use access lists to restrict the engineering VLAN from access to devices on the finance VLAN. The switch does not route non−IP packets between VLANs and routed ports. You can forward these non−IP packets with fallback bridging. In order to use this feature, you must have the IP services image, formerly known as the enhanced multilayer image (EMI), installed on your switch.

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