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Layer 3 switch4/16/2023 ![]() Note: This document uses a Catalyst 3550 as an example. On Catalyst switches it is accomplished by the creation of Layer 3 interfaces (switch virtual interfaces (SVIs) ). Whenever hosts in one VLAN need to communicate with hosts in another VLAN, the traffic must be routed between them. VLANs divide broadcast domains in a LAN environment. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. The information in this document is based on a Catalyst 3550-48 that runs Cisco IOS Software Release 12.2(44)SE6 EMI. If you need information on how to configure VLANs, access ports, and trunking on the 3550, refer to Creating Ethernet VLANs on Catalyst Switches for the specific Cisco IOS version you run on the switch. This document assumes that Layer 2 has been configured and that the devices within the same VLAN connected to the 3550 communicate with one another. This document also provides the procedure to upgrade the Cisco IOS code to a version that supports interVLAN routing. For more information on the differences between SMI and EMI, refer to Upgrading Software Images on Catalyst 3550 Series Switches Using the Command Line Interface.
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