![]() The show vlan-switch command is used insteadġ default active Fa1/1, Fa1/2, Fa1/3, Fa1/4 ![]() Unlike a switch, there is no show vlan command on the router IOS. Configuration on S0, this is the same on S1 and S2 Based on many industry recommendations, I configure the switches to be in VTP transparent mode (effectively disabling VTP on the particular switch, but allowing VTP frames to be forwarded through the switch for switches that support VTP version 2). ![]() In this example I configure 2 VLANS named MikesBlog (10) and Internet (20) on all of the routers. The familiar commands from the global configuration mode of the router are available to configure VLANs and VLAN Trunking Protocol (VTP) settings. Multiple VLANs travel across a single link using a trunking protocol such as the industry standard 802.1Q or the Cisco-proprietary Inter-Switch link (ISL). VLANs allow broadcast domains to be isolated to specific ports across a number of switches in a layer 2 topology. S0(config)#interface range fastethernet 1/0 - 15 Use the switchport command to make the ports switched (rather than routed) ports, Let's get started with the basics of the layer 2 network.Ĭonfiguring the NM-16ESW for Switch-mode Operation In all of the examples, I will be working with the following topology using the Advanced Enterprise Services version of 12.4(15)T7, In this post, I will show how a Cisco c3725 with an NM-16ESW module can be configured to perform specific layer 2 functions such as Spanning Tree Protocol (IEEE, but not Rapid STP or Multipe STP ), VLANs, VLAN Trunking, VLAN Trunk Protocol (VTP). There are ways to perform some of the important features of the layer 2 network that managed switches provide when working with a routed (layer 3) network in GNS3. GNS3 and Dynamips are not good testing and training platforms for the CCNA, CCNP, or CCIE switching topics and not good tools for any IT training courses that need to cover switching related exam objectives. Why is this? Cisco has designed a number of application specific integrated circuits (ASICs) that have not been reversed engineered by the Dynamips team or anyone else in the community to create a viable software emulation. In this guide, I will be demonstrating how to may a router act as a layer two device on the network.To clarify one thing at the beginning, there is no version of dynamips or GNS3 currently that has the capability of running a Cisco Switch IOS image. A Router provides routing capabilities (intent-based networking for the WAN, LAN, and cloudRouters connect computers and other devices to the Internet). In this article, I will be discussing the Graphical Network Simulator (GNS3). When it comes to network simulators and emulators, everyone has their favorite. For some articles I have written on GNS3, please see the following guides “Error– Failed to open a session for the virtual machine GNS3 VM, how to make a router function as a switch in GNS3 and Graphical Network Simulator: How to connect GNS3 to the internet on Windows. GNS3 enables you to run a Cisco IOS in a virtual environment and serves as a graphical user interface to Dynamics. ![]() GNS3 is open-source software that helps in emulating networks using the Cisco Internetwork Operating Systems (IOS). ![]()
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