If they do not exist, add them on the switch. Use the show vlan command in order to verify that the VLANs exist in the VLAN database. In this example, you want to route traffic between VLANs 2, 3 and 10. Make note of the VLANs that you want to route between. The command, if enabled, appears towards the top of the output. Tip: Check the show running-configuration. See the Prerequisites section for more information. Note: If the switch does not accept the ip routing command, upgrade to either SMI image Cisco IOS Software Release12.1(11)EA1 or later, or an EMI image, and repeat this step.
Even if IP routing was previously enabled, this step ensures that it is activated. For such a scenario that uses a Catalyst 3550, refer to Configuring InterVLAN Routing with Catalyst 3550 Series Switches.Ĭomplete these steps in order to configure a switch to perform interVLAN routing.Įnable routing on the switch with the ip routing command. The scenario can be expanded to include a multi-switch environment if you first configure and test inter-switch connectivity across the network before you configure the routing capability. This logical diagram explains a simple interVLAN routing scenario. In this section, you are presented with the information to configure the features described in this document. However, the concepts can also be applied to other Layer 3 switches that run Cisco IOS ® (for example, Catalyst 3560, 3750, Catalyst 4500/4000 Series with Sup II+ or later, or Catalyst 6500/6000 Series that run Cisco IOS System software). 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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