Refer to Table 1 for a sample list of switch models that support trunking: To create the examples in this document, the next switches in a lab environment were used with cleared configurations:Ĭatalyst 3512XL switch that runs Cisco IOS 12.0(5.x)XUĬisco 2621 router that runs Cisco IOS 12.1(3)Tįor Catalyst 2900XL/3500XL/2940/2950/2970 Switches: The Cisco router is used to do the Inter-VLAN routing between VLAN-X and VLAN-Y, this configuration can be useful when the Catalyst series switches are Layer 2 (L2) only and cannot route or communicate between the VLANs (such as 2900XL/3500XL/2940/2950/2970). Institute of Electrical and Electronics Engineers (IEEE) 802.1Q standard.Ī trunk link is created and used to carry traffic from two or more VLANs, for example, VLAN1 and VLAN2 across a single link between Catalyst switches and/or a Cisco router. InterSwitch Link (ISL) Cisco proprietary protocol. Initially, there were two ways in which Ethernet trunking was implemented: Trunking is a way to carry traffic from several VLANs over a point-to-point link between the two devices. Cisco 3600 or other members of the Cisco 2600 series routers, with FastEthernet interfaces, and any Catalyst switch can be used in the scenarios presented in this document to obtain the same results. This document describes the configurations to setup Inter-VLAN routing with the use of an external Cisco routers and explains it with sample configurations on 802.1Q trunking between a Catalyst 3500-XL switch and a Cisco 2600 router the results of each command are displayed as they are executed. Conventionsįor more information on document conventions, refer to the Cisco Technical Tips Conventions. 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. Cisco 2621 router that runs Cisco IOS 12.1(3)T.Catalyst 3512XL switch that runs Cisco IOS 12.0(5.x)XU.The information in this document is based on these software and hardware versions: Prerequisites RequirementsĬisco recommends that you have knowledge of this topics: This document describes how to configure the configurations to set up Inter VLAN routing with the use of an external Cisco router.
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