In this lab, you will configure ssh access and layer 2 security for s1. May 10, 2017 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. S1 is a layer 2 switch, so it makes forwarding decisions based on the layer 2 header. Cisco nexus 7000 series nxos layer 2 switching configuration. Apr 05, 2008 the data link layer is often overlooked and trusted as it is limited by the organization physical boundaries is this true. In a typical lan, all hosts are connected to one central device. The diagram above shows one layer 3 switch used for aggregation, three layer 2 switches used for access purposes and one router for internet connectivity. This attack will also fill the cam tables of adjacent switches.
We have a cisco switch on each side but the fiber it runs over is leased and encryption aes256 minimum is required on a leased line. Cisco catalyst 385024ps 24port gigabit ethernet switch. Cisco industrial ethernet 3000 layer 2 layer 3 series switches product overview the cisco industrial ethernet 3000 series ie 3000 series is a family of layer 2 and layer 3 switches that bring cisco s leadership in switching to industrial ethernet applications with innovative features, robust security, and superior ease of use. Cisco stackpower enables power redundancy across a group of four cisco catalyst 3850 series switches within same stack.
The cisco catalyst 2960x series switches provide a range of security features to limit access to the network and mitigate threats, including. Network switches, lan and enterprise switches cisco. Fragmentation is a layer 3 function where the ip header can contain information indicating that fragmentation has occurred and whether this packet is the last packet or not. The switch cisco ios software provides many security features that are specific to switch functions and protocols. Difference between layer 2 switch and layer 3 switch. Understanding and preparing for network threats is important, and hardening layer 2 is becoming imperative.
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. Each site has a cisco 3560 switch that connects to the providers network on fa01. Layer 2 attacks and mitigation techniques for the cisco. How to install cisco layer 2 switch in gns3 with myanmar. A layer 2 network device is a multiport device that uses hardware addresses, mac address, to process and forward data at the data link layer layer 2. Default layer 2 ethernet interface vlan configuration 1216. All testing was done on cisco equipment, ethernet switch attack resilience varies. The bridge learns the mac address of each connected device. The cisco industrial ethernet 3000 series ie 3000 series is a family of layer 2 and layer 3 switches that bring ciscos leadership in switching to industrial ethernet applications with innovative features, robust security, and superior ease of use. The category of layer 2 switch recommends you various cisco series switches, including cisco catalyst 2960, cisco catalyst 2960s series switches.
Vmware virtual san layer 2 and layer 3 network topologies. Access controls user and workgroup access to the resources on the network. Changing arp bindings requires manual intervention. Layer 2 switching methods how a lan switch works cisco. Create a basic switch configuration, including a name and an ip address. Cisco nexus 7000 series nxos layer 2 switching command.
Cisco is continuously raising the bar for security, and security feature availability at layer 2 is no exception. After all, any network devices routers, firewalls, computers, servers etc have to be connected to a switch. By default, each cisco switch port uses ethernet autonegoti. Solved encryption on cisco switches over layer 2 ethernet.
Datasheet ms125 switches ms125 switches cloudmanaged access switches cisco meraki ms125 switches provide layer 2 access switching ideal for branch and campus. Cisco nexus 3000 series nxos layer 2 switching configuration. This video will show you the diferrences between a layer 3 switch and a layer 2 switch using multiple vlans and a remote network. A layer 2 switch is a type of network switch or device that works on the data link layer osi layer 2. A maclevel switch operates in layer 2 of the osi model and can also operate in a combination of layers 2 and 3. Layer2 and layer3 switches are the foundation of any network.
Cisco switches can be used as plugandplay devices out of the box but they also offer an enormous amount of features. Routing in layer 2 and layer 3 switch switching operates at layer 2 of the osi reference model, where data packets are redirected to a destination port based on mac addresses. Layer 2 switch is responsible for a lot of operations at the data link layer of the osi model. Vlans allow for greater flexibility by allowing different layer 3 networks to be sharing the same layer 2 infrastructure. Layer 2 switching also known as bridging in the access layer. This chapter describes how to identify and resolve problems that can occur with layer 2 switching in the cisco nexus 5000 series switch. Routing operates at layer 3, where packets are sent to a specific nexthop ip address, based on destination ip address. In this lab, you will configure ssh access and layer 2 security for s1 and s2. The departments are callenter, sales, accounting, support and management.
Layer 2 3 command reference, cisco ios xe release 3se catalyst 3850 switches chapter title. Campus lan with layer 2 access and simplified distribution. Layer 2 lan access deployment cisco catalyst 3650 series and catalyst 3850 series switches are fixedport, stackable, 10100 ethernet. Layer 2 switching or data link layer switching is the process of using devices mac addresses to decide where to forward frames. This article describes the functionality and expected behavior of lan ports on mx and zseries devices, and how they handle and interact with layer 2. To enable multilayer switching, lan switches must use storeandforward techniques because the switch must receive the entire frame before it performs any protocol layer. Layer 2 switch security technical implementation guide cisco. This will turn a vlan on a switch basically into a hub. Traditional switching operates at layer 2 of the osi model, where packets are sent to a specific switch port based on destination mac addresses. This document covers the vlan configurations for the below listed supermicro switch. Unfortunately this means if one layer is hacked, communications are compromised without the other layers being aware of the problem security is only as strong as the weakest link. Let say r1 sends a packet of size 1510 bytes, which means the whole frame with be 1524 bytes with 14 bytes for l2.
Finding degraded performance across link approaching steps. You can configure layer 2 switching ports as access or trunk ports. Layer visibility meraki is the only switch to include integrated layer 7 fingerprinting. Cvd to deploy a layer 2 access and a simplified distribution using a switch stack. Troubleshooting layer 2 switching issues layer 2 is the data link layer of the open systems interconnection model osi model of computer networking. A layer 2 switch can assign vlans to specific switch ports, which in turn are in different layer 3 subnets, and therefore in different broadcast domains.
Here is an example of the cisco hierarchical model. Security features on switches securing layer 2 cisco press. Trunks carry the traffic of multiple vlans over a single link and allow you to. The cisco industrial ethernet 3000 series ie 3000 series is a family of layer 2 and layer 3 switches that bring cisco s leadership in switching to industrial ethernet applications with innovative features, robust security, and superior ease of use. 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. Portbased acls for layer 2 interfaces allow security policies to be applied on individual switch ports. Catalyst 2960 switch software configuration guide full book in pdf. Cloudmanaged switching for branch and small campus. Sitetosite communications using layer 2 wan services 4. Security features found in more expensive full layer 2 managed switches. Cisco s unified access data plane uadp applicationspecific integrated circuit asic powers the switch and enables uniform wiredwireless policy enforcement, application.
As such, when connecting an mx to a more complex layer 2 network, additional planning may be required to ensure there are no issues with layer 2 traffic. Security technical implementation guides stigs that provides a. Differences between layer 2 and layer 3 switches compare. Although this chapter shows you how to configure layer 3 switching on the catalyst 60006500, the same concepts and configurations discussed in scenarios based around layer 3 switching using cisco express forwarding cef can be applied to other cefbased cisco catalyst layer 3 switching platforms, such as the catalyst 3550 and catalyst 40004500 supervisor 34 engines. Devices in the same layer 2 segment do not need routing to reach local peers. 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. The sections that follow highlight the layer 2 security features available on cisco catalyst switches.
Cisco switch layer2 layer3 design and configuration. It offers 24 gigabit copper ports and 2 shared small formfactor pluggable sfp modules for. Cisco switch commands cheat sheet cli cisco switches can be used as plugandplay devices out of the box but they also offer an enormous amount of features. Multilayer switches apply the same behavior as layer 2 switches but add an additional parallel lookup for how to route a packet, as illustrated in figure 2 15. Security technical implementation guides stigs that provides a methodology for standardized secure installation and maintenance of dod ia and iaenabled devices and systems. Iplevel switches operate in layer 3, layer 4, or a combination of the two. In a properly designed network, lan switches are responsible for directing and controlling the data the flow at the access layer to networked resources. This layer usually incorporates layer 2 switches and access points that provide connectivity between workstations and servers. Network switch is a device, which connects end stations or end users at data link layer level. Macbased vlan assignment enables different users to authenticate on different vlans. To support vlan interfaces, create and configure vlans on the switch stack, and assign vlan membership to layer 2 interfaces. Cisco slm2024 manual pdf view and download cisco slm user manual online. Cisco nexus 7000 series nxos layer 2 switching command reference pdf complete book 2. Layer 2 overview although nxos is a single operating system for the nexus line of switches, the hardware architecture of the switches might differ slightly.
Multilayer switching is a switching technique that switches at both the data link osi layer 2 and network osi layer 3 layers. Although the main purpose of the switch is to provide interconnectivity in layer 2. Layer 2 is the data link layer of the open systems interconnection model osi model of computer networking. They break up one large collision domain into multiple smaller ones. The layer 2 local switching feature allows you to switch layer 2 data between two interfaces on the same router, and in some cases to switch layer 2 data between two circuits. A switch operating as a network bridge may interconnect devices in a home or office. Switches came to market as an intelligent solution for network hubs, which provide highspeed networking facilities.
Identify hundreds of applications from business apps to bittorrent and youtube. Layer 2 wan technology design guide august 2014 cisco. The erspan feature is not supported on layer 2 switching interfaces. A second layer of switches can be added to build a hierarchical network.
Cisco industrial ethernet 3000 layer 2layer 3 series switches product overview the cisco industrial ethernet 3000 series ie 3000 series is a family of layer 2 and layer 3 switches that bring ciscos leadership in switching to industrial ethernet applications with innovative features, robust security, and superior ease of use. 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. L2tpv3 layer 2 tunnel protocol version 3 l2tpv3 layer two tunneling protocol version 3 is a pointtopoint layer two over ip tunnel. Company x has several departments grouped on several levels in a building. When a layer 2 switch forwards traffic, the switch will not modify the original frame. Some of their works involve mac address forwarding, ingress queue, access control list. Aug 04, 2014 i have three sites that are connected to each other with a layer 2 ethernet provider in a mesh configuration. Layer 2 switches are a category of switch products that are the closest hardware descendants of the network bridge. This video will show you the diferrences between a layer 3 switch and a layer 2 switch using multiple vlans and a. Introduction this document will explain you initial layer 2 troubleshooting steps with some helpful ios command. Layer 2 switches do not process transit frames at layer 3. As mentioned earlier, a layer 2 switch operates at the datalink layer, which means the switch forwards traffic based on mac addresses.
They get their name from the sense that they may operate primarily on layer 2 of the osi model of networking where the data link information is examined and the switching. Layer 23 command reference, cisco ios xe release 3se. This allows the flexible arrangement of power supplies in the stack, and. Layer 2 vpn architectures is a comprehensive guide to consolidating network infrastructures and extending vpn services. The cisco sps switches facilitate the delivery of multiple services over a layer 2 network with support for qinq. Gigabit ethernet interfaces for layer 2 switching on catalyst 4500 series switches. These stackable 48 x 1g switches provide layer 2 access switching along with the centralized management platform that offers deep visibility into your network. This means you can tunnel l2 protocols like ethernet. We have a situation where we need to encrypt the traffic on a layer 2 vlan. Layer 2 interface configuration guidelines and restrictions, page 105. Simple, flexible software subscription suites help you achieve the latest cisco dna innovations in policybased automation, secure connectivity, and critical analytics and assurance across your network.
The cisco catalyst 3650 is built on the advanced cisco stackwise160, and takes advantage of the new cisco unified access data plane uadp applicationspecific integrated circuit asic. Vlans would be terminated at the access layer switch no userto switch 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. The book opens by discussing layer 2 vpn applications utilizing both atom and l2tpv3 protocols and comparing layer 3 versus layer 2 providerprovisioned vpns. Check for physical interface problems like duplex mismatch. 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. Perhaps the strongest driving force to deploying a layer 2 network was that layer 3 devices could not keep up with layer 2 switching engines.
Fun with ethernet switches sean convery, cisco systems. The cisco catalyst 3850 series is the enterpriseclass stackable access layer switches that provide full convergence between wired and wireless on a single platform. 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. How to enable layer 3 routing on switch cisco community. Cisco ip multicast networking, authors josh loveless, ray blair, and arvind durai take an indepth look at ip multicast messages at layer 2 and how they are transported in a layer 2 domain. Download layer 2 switch bin image file i86bilinuxl2adventerprisek915. This section provides an overview and description of the different physical network and vsphere technologies that are required for deployments of virtual san across layer 2 and layer 3 ip network topologies. Industrial design and compliance tools for easy deployment, management, and replacement. Cisco nexus 7000 series nxos configuration examples, release 5. The only exception is when you implement quality of service qos on your switch.
Some ios version may require a manual shutdown command before. Configuring an ethernet interface as a trunk port 1216. Layer 2 ethernet ports on cisco switches support simultaneous, parallel connections between layer 2. When it comes to networking, layer 2 can be a very weak link. This chapter covers the basic elements of multicast functionality in layer 2.
This feature enables each user to have a different data vlan on the same interface. With the introduction of cisco s powerful switches and vlan feature, most companies started to deploy a switched network with vlans extending throughout the lan campus. This switch can enable uniform wiredwireless policy enforcement, application visibility, flexibility, application optimization, and superior resiliency. Cisco catalysts switches equipped with the enhanced multilayer image emi can work as layer 3 devices with full routing capabilities.
How to configure a cisco layer 3 switchintervlan routing. This is done by specifying a default gateway address that points to a router or layer 3 switch. These stackable 48 x 1g switches provide layer 2 access switching along with the centralized management platform that offers. Switches and bridges are used for layer 2 switching. Layer 2 wan services, a remote site distribution layer switch, and wan qos. Cisco industrial ethernet 3000 layer 2layer 3 series.
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