A layer 2 switch is a type of network switch or device that works on the data link layer osi layer 2 and utilizes mac address to determine the path through where the frames are to be forwarded. Layer 2 lan interface configura tion guidelines and restrictions when configuring layer 2 lan ports, follow these guidelines and restrictions. Example switch models that support layer 3 routing are the 3550, 3750, 3560 etc. In most cases, the default configuration of switches will. To configure layer 2 ports as layer 3 you have to give a command no switchport at interface config mode and assign an ip address and no shut. Avaya ethernet routing switch 3500 series configuration. The configuration tasks in this chapter apply to fast. Gigabit ethernet interfaces for layer 2 switching on catalyst. If multiple networks are connected to a switch, you need to specify how the switch forwards the internetwork frames, because the path must be determined at layer three. In this chapter, we will explore switching concepts and the basic configuration of a switch. Vlans would be terminated at the accesslayer switch no usertoswitch redundancy, thus no hsrp, the links between access and distribution layer would be p2p l3 links routed interfaces and every single switch would participate in the ospf routing. Enhanced layer 2 cli configuration statement and command changes.
We will conclude with the basic configuration of a switch and this will lead us into the discussion on. In this beginners networking training series, our previous tutorial briefed us about subnetting and network classes in detail we will learn the various features and application of switches at layer2 and layer3 of the osi reference model. Although physically separate, the nexus 5000 and 2000 are managed as a single entity from a software image, configuration. As mentioned earlier, a layer 2 switch operates at the datalink layer, which means the switch forwards traffic based on mac addresses. Cisco industrial ethernet 3000 layer 2layer 3 series. As each bridge is a separate layer 2 domain you have isolated the ports from each other symptoms you start to use your switch and notice that one set of. To configure vlan on the switch, firstly enable the ios. Switch concepts and configuration part i ccna blog. It can be best described by what more it does compared to a layer 2 switch and what less it does compared to a gateway router. Cisco switches can be used as plugandplay devices out of the box but they also offer an enormous amount of features. Layer 2 support and configurations 39 continue this analogy, the nexus 5000 operates as a supervisor module for the virtual chassis. Sdx smb switch layer 2 services configuration guide version 3 created by adtranendocuments on jan 3, 2019 9. Before proceeding, please refer to the layer 3 switch overview for general information and configuration options.
Configuration guide of layer3 managed switch planet technology. Spanning tree protocol overview the plugandplay spanning tree protocol stp, a layer 2 protocol that ensures a loopfree topology in bridged lans, has been around for decades. It also provides guidelines, procedures, and configuration examples. Configuring bridge domains as switches for layer 2 trunk ports 46 iii. Trunks carry the traffic of multiple vlans over a single link and allow you to. Activestandby redundancy in a layer 2 switched domain. This article outlines a basic example of how layer 3 routing functionality on ms series switches could be implemented. You can configure layer 2 switching ports as access or trunk ports. Vmware virtual san layer 2 and layer 3 network topologies deployments. Cisco switch layer2 layer3 design and configuration. Layer2 switching also known as bridging in the access layer.
The extremeswitching 200 series is an economical, fixedconfiguration family of gigabit ethernet layer 23 switches designed for enterprises, branch offices, and small to mediumsized businesses looking for key features in a flexible, yet easytomanage solution. Layer 3 network pim source specific mode communication flow. Since vlans exist in their own layer 3 subnet, routing will need to occur for traffic to flow in between vlans. If the layer 2 configuration does not provide an option to eliminate redundancy for the management vlan, separate physical connections supporting only the management vlan should be considered. To switch frames between lan ports efficiently, the router maintains an address table.
Save the running configuration to the startup configuration from the privileged exec mode prompt. To remove the userconfigured name from a vlan, use the no form of this command. Switches and bridges are used for layer 2 switching. Table 103 shows the layer 2 lan port default configuration. This is done by specifying a default gateway address that. Represents a generic switch, such as a layer 2 or layer 3 switch, or a router that supports layer 2 forwarding and other layer 2 features. All about layer 2 and layer 3 switches in networking system. Cisco nexus 3548 switch nxos layer 2 switching command reference ol2784703 chapter layer 2 commands name vlan configuration name vlan configuration to set the name for a vlan, use the name command. It uses hardware based switching techniques to connect and transmit data in a local area network lan. Layer 2 design and configuration when isl comes up, each vlag switch installs its peer mac address as a static macaddress entry in fdb for isl portchannel and each vlan it is a member of, need to. Avaya ethernet routing switch 3500 series configuration layer 2 5. Layer 2 switch is responsible for a lot of operations at the data link layer of the osi model.
This chapter covers common implementations and syntax for layer 2 features such as virtual localarea networks vlans, private vlans pvlans, spanning tree protocol stp, unidirectional link detection udld, and virtual port channel vpc. Spanning tree protocol in layer 2layer 3 environments. Layer 2 vpn architectures is a comprehensive guide to consolidating network infrastructures and extending vpn services. The only exception is when you implement quality of service qos on your switch. With source specific multicast, shortestpath trees are built and are rooted in just one source, offering a more secure and scalable model for a limited amount of applications mostly broadcasting of. Layer 2 network design guidelines always connect hierarchically if there are multiple switches in a building, use an aggregation switch locate the aggregation switch close to the building entry point e. Although the main purpose of the switch is to provide interconnectivity in layer 2 for the connected devices of the network, there are myriad features and functionalities that can be configured on cisco switches. By default, all the vlans configured on a switch are allowed on the trunk interfaces.
How to enable layer 3 routing on switch cisco community. However, a best practice for basic switch configuration is to change the management vlan to a vlan. In most cases, the default configuration of switches will enable the switch to connect pcs and servers together with ease plug and play. Vlan configuration guide supermicro l2l3 switches configuration guide 4 1 vlan configuration guide this document describes the virtual local area network vlan feature supported in supermicro layer 2 layer 3 switch products. Ip routing layer 2 and 3 switch ports dhcp pool acls stacking then applying a basic configuration. Layer2 and layer3 switches are the foundation of any network.
The book opens by discussing layer 2 vpn applications utilizing both atom and l2tpv3 protocols and comparing layer 3 versus layer 2 providerprovisioned vpns. They break up one large collision domain into multiple smaller ones in a typical lan, all hosts are connected to. On a layer3capable switch, the port interfaces work as layer 2 access ports by default, but you can also configure them as routed ports which act as normal router interfaces. Layer 2 switching or data link layer switching is the process of using devices mac addresses to decide where to forward frames. This is not a comprehensive talk on configuring ethernet switches for security. When a layer 2 switch forwards traffic, the switch will not modify the original frame. Security technical implementation guides stigs that provides a methodology for standardized secure installation and maintenance of dod ia and iaenabled devices and systems. The image below shows an example of a multivlan environment on a layer 2 switch.
Ccna security lab securing layer 2 switches topology. Some of their works involve mac address forwarding, ingress queue, access control list. The default configuration on the switch is to have the management of the switch controlled through vlan 1. In the diagram, the access switches are connected directly to an aggregation switch which is connected to other services like the server farm and the internet service provider. Ensure that the management vlan does not have any user traffic on it by only allowing switch management interfaces to be members of that vlan. A layer 3 switch is basically a switch that can perform routing functions in addition to switching. Cisco nexus 7000 series nxos configuration examples, release 5. Featuring complete layer 2 and layer 3 switching capabilities, the ex3200 satisfies the. The category of layer 2 switch recommends you various cisco series switches, including cisco catalyst 2960, cisco catalyst 2960s series switches. If you are buying a layer 2 or layer 3 switch, there are some key parameters that you should check out, including the forwarding rate, backplane bandwidth, number of vlans, memory of mac address, latency, etc. Vmware virtual san layer 2 and layer 3 network topologies. You are using a crs3xx series switch you need to isolate certain ports from each other. Configuring layer 2 ethernet interfaces this chapter describes how to use the commandline interface cli to configure fast ethernet and gigabit ethernet interfaces for layer 2 switching on catalyst 4500 series switches. The truck port is smart enough to bear the traffic of several vlans.
The ruckus icx 7750 campus switch delivers industryleading. This chapter describes how to use the commandline interface cli to configure fast ethernet and. Chapter 2 layer 2 support and configurations the nexus line of switches provides a robust layer 2 feature set. Switches are layer 2 devices and are therefore relatively easy to configure in comparison to routers. Save the basic configurations for the router and both switches. After all, any network devices routers, firewalls, computers, servers etc have to be connected to a switch. Seethecisconexus7000seriesnxoshighavailabilityandredundancyguideforcompleteinformation onhighavailabilityfeatures. One untagged port within each vlan is used to connect the layer 2 switch to a layer 3 switch for layer 3 connectivity between the two portbased vlans. Layer 2 switch security technical implementation guide cisco. Layer 2 misconfigurations multiple bridges scenario. Switch configuration by the end of this session, you will be able to. Cisco nexus 9000 series nxos layer 2 switching configuration. To configure routing protocol you have to configure it the way you do on normal routers. But very imp is that by default ip routing is disable you have to enable it first for any routing to work.
Cisco nexus 7000 series nxos layer 2 switching configuration. We will discuss the switchs operation, layer 2 and layer 3 switching as well as other concepts. S1 is a layer 2 switch, so it makes forwarding decisions based on the layer 2 header. In addition to describing the concepts related to layer 2 vpns, this book provides an extensive collection of case. Ruckus fastiron layer 2 switching configuration guide, 08. A network switch also called switching hub, bridging hub, officially mac bridge is networking hardware that connects devices on a computer network by using packet switching to receive, and forward data to the destination device a network switch is a multiport network bridge that uses media access control addresses to forward data at the data link layer layer 2 of the osi model. Last modified by adtranendocuments on jul 1, 2019 5. How to configure a cisco layer 3 switchintervlan routing.
Fastiron ethernet switch platform and layer 2 switching. After a few seconds, vlan 99 will come up because at least one port is now assigned to vlan 99. Spanning treeenabled switches go through a root election process based on bridge p rotocol data unit. When comparing the layer 2 switch to a layer 3 switch the first thing to look at is what additional software functionality you are getting.