layer 2 network diagram

The purpose of dividing the Bitdatenstromes in blocks - as frames or frame designated - and the addition of checksums as part of the channel coding. I’ve also set each colour to 50% opacity so that you “see” through the layers. They should either be located beside one another or in parallel locations on opposite sides of the picture. Physical (e.g. provides LLC functions to IEEE 802 MAC layers, Logical link control (Error & Flow control), Media access control (MAC, LAN switching, Physical addressing, QaS, VLAN, ...). It furnishes transmission protocol knowledge and management and handles errors in the physical layer, … Data Link (Layer 2) At OSI Model, Layer 2, data packets are encoded and decoded into bits. ), Sample Layer 1 network diagram, as it might look in Visio. L3 device configurations– text files or access to GUI, etc. In the networking world, most switches operate at Layer 2… Please turn it on so you can see and interact with everything on our site. Name and email are required, but don't worry, we won't publish your email address. Here I’ve chosen a colour on the bottom row of the OS X Colour picker and each layer is the next colour along. You’re very welcome, Dominic. It’s customary to show router redundancy protocols as an elongated ellipse that covers the router links included in the high availability group. Layer 3 Network examples include AppleTalk DDP, IP, IPX. Kevin holds a Ph.D. in theoretical physics and numerous industry certifications. How long will you and your friend take to get to the lake for your picnic? Your eBook is phenomenal. I like to show the layout so that it represents the flow of traffic in a broad sense. I don’t want to see any kind of indication of trunk links on a Layer 3 diagram either. Sample Layer 2 network diagram, as it might look in Visio. First, we start to draw our network diagram with routers and MPLS cloud but without any link : Then we select all shapes and add them to a new layer « none » which will be displayed with secondary layers (L1, L2/L3, routing). Network Diagram. Routing operates at layer 3, where packets are sent to a specific next-hop IP address, based on destination IP address. It also includes a great example of a Layer 2 diagram. For example, I might make fiber optic cables red and copper cables blue. Layer 2 is the network layer used to transfer data between adjacent network nodes in a wide area network or between nodes on the same local area network. The OSI model was developed by the International Organization for Standardization. Glad you found the blog post and ebook helpful, Trina! I have logged in to the cisco boxes and downloaded the running configuration files for all 3. Common hardware on this layer: Bridge, Switch (Multiport bridge). The layer-3 switch in combination with a number of layer-2 switches supports more users to connect on the network without the need for implementation of an extra layer-3 switch and more bandwidth. It seems to me that companies project different ideas of what should be displayed in each diagram. I've been tasked with drawing a layer 2 network map of our very small datacenter network. The sender & receiver’s IP address are placed in the header by the network layer. Good network diagrams aren’t hard to make, but I find them distressingly rare. I would also like to know if there is a manual or a book that provides clear uniform samples. Inter-network routing and global addressing are higher-layer functions, allowing data-link protocols to focus on local delivery, addressing, and media arbitration. It was designed to provide a unified data-carrying service for both circuit-based clients and packet-switching clients which provide a datagram-based service model. In a network that includes many different types of cables, such as fiber optic cables, Category 5 / 6 / 7 copper cabling, and so forth, it’s useful to give each cable type a different color. Data-link protocols specify how devices detect and recover from such collisions, and may provide mechanisms to reduce or prevent them. (Technically the cable type is Layer 1 information, but because it doesn’t tend to cause confusion in the picture, it’s alright to include it in your Layer 2 diagram. In the OSI seven-layer model, Layer 3 works atop Layer 2, which works atop Layer 1. Kevin has 15+ years of experience as a network engineer. data link layer and sends a “Frames” to destination port using MAC address table which stores the mac address of a device associated with that port. A Network Diagram showing Layer 2. Now i understand, how to amake my diagrams, The other important thing about Layer 3 diagrams is that they should only include Layer 3 objects. Diagram map. Including Layer 2 objects like a switch in a Layer 3 diagram is confusing, particularly in more complicated pictures. Auvik’s cloud-based network management software keeps IT networks around the world running optimally. If your network is live, make sure that you unde… If you need the switch to aggregate multiple access switches and do inter-VLAN routing, then a Layer 3 switch is needed. The international engineering organization IEEE saw the need to regulate for local networks also competing access to a transmission medium, which is not foreseen in the OSI model. Devices in the same layer 2 segment do not need routing to reach local peers. Combining them only confuses the information and makes the drawing harder to understand. It clearly explains Networking concepts. Layout is important. I always start with Layer 3 diagrams, which show the IP subnets and all Layer 3 network devices like routers, firewalls, and load balancers. It helped me with rudimentary concepts that I skipped b/c diagrams were needed immediately. Remember that a logical network diagram only records the nodes in the network which have an in-band, layer-3 presence. Presentation (e.g. The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer networking. Layer 2 switch work on layer 2 of OSI model i.e. Another useful thing to put into a Layer 3 diagram is organizational boxes. 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. The Layer 3 diagram should show any high availability mechanisms and redundant network components or redundant paths. L2 (or L1) diagram– presenting physical connections between L3 devices and switches. An article on packetpushers served as a source of inspiration and also as a source for the sample network diagram. Learn more about diagram layers. Got something to say? In the Internet Protocol Suite (TCP/IP), the data link layer functionality is contained within the link layer, the lowest layer of the descriptive model. It’s a diagram that shows exactly what you would see when looking at the front (and sometimes also the back) of the cabinet. I don’t want to see switches in a Layer 3 diagram, for example. Data Link (e.g. Layer 2 tunneling protocols, such as L2TP, do not provide encryption mechanisms for the traffic it tunnels. MAC, switches) 3. Thus it is widely implemented in universities and small-scale industries. Logical network diagrams. There is one 1841 cisco router, two 3560 cisco catalyst switches and 4 solaris sunfire T-1000 boxes. A cabinet layout is helpful when you need to tell a remote technician how to find a certain piece of equipment. By submitting this form, I acknowledge I've reviewed and accepted Auvik's privacy notice, which details how my personal information will be processed. Unlike Layer 3 pictures, Layer 2 diagrams don’t need to be laid out in any special way. OSI subdivides the Network Layer into three sublayers: 3a) Subnetwork Access, 3b) Subnetwork Dependent Convergence and 3c) Subnetwork Independent Convergence. IP, routers) 4. Ethernet devices use 'burned in' MAC addresses to identify each host. If two devices are intended to provide redundancy for one another, then their positions on the page should be related. It’s better to draw several diagrams that show different aspects of the same network than to try to put everything on one sheet of paper. The information in this document was created from the devices in a specific lab environment. Network Layer (Layer 3) : Network layer works for the transmission of data from one host to the other located in different networks. "1. There are 7 layers: 1. Excerpted from The No Sweat Guide to Network Topology. After that comes a Layer 1 diagram showing physical layouts of the devices. Core service porvider by assign P router as P1 and P2, PE router as PE1 - 8 for support CE router of customers. For example, I might draw all of my workstation and server segments horizontally, but then draw a special common network management segment vertically down one side of the page. TCP, UDP, port numbers) 5. About the only time I use a combination of vertical and horizontal is when I want to show a fundamental difference between the functions of the segments. In more complicated network designs, I often use a base Layer 3 diagram showing the VLANs, routers, and firewalls. Awesome! Can also be used when displaying a sequence of actions or hidden processes. encryption, A… Layer 1 diagrams should show port numbers and indicate cable types. I usually show link speed with the thickness of my diagram’s connecting lines. Dive into our sandbox to demo Auvik on your own right now. Another layout consideration is to always draw your network
segments either horizontally or vertically. A diagram map is a canvas on which a network diagram displays by default. It’s important to draw each of these as separate pictures because they show different things. L2 device configurations– text files or access to GUI, etc. This document is not restricted to specific software and hardware versions. All of the devices used in this document started with a cleared (default) configuration. Layer 2, also known as the Data Link Layer, is the second level in the seven-layer OSI reference model for network protocol design.Layer 2 is equivalent to the link layer (the lowest layer) in the TCP/IP network model. Using a Layer diagram gives you the ability to show the structure of an object in a section, the structure of an organization or a process on which several departments are working. I might have an overlay diagram showing the routing protocol design, another one showing VPNs, and still another showing key application data flows, if that’s an important consideration. Looks like you have JavaScript disabled. Layer 2 diagrams show Layer 2 objects like switches and trunks. A layer diagram is used in a number of fields. Bits are transferred over a variety of medium, cables, ports etc. selection of the shortest path to transmit the packet, from the number of routes available. In many cases, this is too much information to show easily, so I generally use callout boxes to hold some of the information. A switch works with MAC addresses at layer 2 of the OSI 7 layer model. After that comes a Layer 1 diagram showing physical layouts of the devices. Instead, they rely on other security protocols, such as IPSec, to encrypt their data. It is now my Bible. This Cisco network diagram example was drawn on the base of the figure illustrating the post "Cisco Lab 1 : Network Design from the requirement" from the blog "Thai Cisco Club". An IPSec tunnel is also established between these devices and all L2TP tunnel traffic is encrypted using IPSec. Thank you … © Copyright 2013-2020 Auvik Networks Inc.. All rights reserved. Use this sample configuration to encrypt L2TP traffic using IPSec for users who dial in. Can you tell me where I can find Layer 1, Layer 2, and Layer 3 network diagrams? The important thing is to be clear in your own mind about what information you’re trying to convey. There is no need to include devices like layer-2 switches, bridges, etc. Hi there! The data link layer or layer 2 is the second layer of the seven-layer OSI model of computer networking. The diagram layer is a composite layer that contains feature layers that are joins between network diagram feature classes and their associated network source classes or object tables. Glad you found them helpful. When devices attempt to use a medium simultaneously, frame collisions occur. From 1st customer project, assign R1-DMVPN and R2-DWVPN as DMVPN Hub, and R3-DMVPN and R4 … To be able to create a logical network diagram, you first need to have following information: 1. Then I make a Layer 2 diagram showing the switch connections, trunks, and LACP channels. If there are security zones or interesting groupings of users by function or servers by application, put them together on the picture, put a box around them, and label the box clearly. I usually start with a Layer 3 network diagram to show the routing and IP subnets. This makes it immediately obvious that the management segment is special. The data link layer is concerned with local delivery of frames between devices on the same LAN. Frames are used to define the data between two nodes on a data link, and when there’s more than two nodes, the network … The data link layer, or layer 2, is the second layer of the seven-layer OSI model of computer networking.This layer is the protocol layer that transfers data between nodes on a network segment across the physical layer. A network diagram can be either physical or logical. This will save you money, time, and heart ache I am adding this to my curriculum for my presentation on best practices for the physical layer of the network. Sometimes I also use color to indicate special properties of different physical links. This means your network diagrams are fully integrated with topology data from both layer 2 and layer 3 of the OSI—including switch-to-router, switch-to-switch, and switch-to-node port connections. The most important thing is to keep the picture clear. When deploying on a Layer 2 network, one of the switches on that network segment (VLAN) should be configured as the IGMP Querier. L2TP tunnel is established between the L2TP Access Concentrator (LAC) and the L2TP Network Server (LNS). Even network engineers with years of experience often make diagrams that are jumbled and hard to understand. As a cable dog I say thank you from the bottom of my heart. The faster the link, the thicker the line. For more tips on building and documenting your network topology, download the free ebook. It also takes care of packet routing i.e. For example, if I have a bunch of servers being accessed by a group of users, I’ll try to put the user network segments on one side of the picture and the servers on the other side. 2. network layer where it route packet by using IP address, it is used widely on VLANs. Traditional switching operates at layer 2 of the OSI model, where packets are sent to a specific switch port based on destination MAC addresses. Another type of diagram that’s often useful in data center designs is a cabinet layout. You can also use NTM’s automated discovery features to modify the node information of objects on your network … They include critical information like which VLANs are included in which trunks, and they show spanning tree parameters like bridge priorities and port costs. Thank you for the feedback. Sample Layer 3 network diagram, as it might look in Visio. So bad blocks are detected by the receiver and either discarded or even corrected; a renewed request discarded blocks sees this layer but not before. This way, the data link layer is analogous to a neighborhood traffic cop; it endeavors to arbitrate between parties contending for access to a medium, without concern for their ultimate destination. Great Job! … Continue reading "Layer Diagrams" Reference to them does not imply association or endorsement. This is fantastic advice. [1] The data link layer provides the functional and procedural means to transfer data between network entities and might provide the means to detect and possibly correct errors that may occur in the physical layer. Similarly, if I want to show how a LAN connects to external networks like the Internet, I group the external networks all on one side or at the top of the picture. Syn/Ack) 6. Layer 2 and Layer 3 refer to different parts of IT network communications. Data-link frames, as these protocol data units are called, do not cross the boundaries of a local network. [1] Hi! It’s then easy to see the exact network path those users take to reach their servers. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment. Layer 2 Network Diagram. Therefore, logical network diagrams typically show subnets (including VLAN IDs, masks, and addresses), network devices like routers and firewalls, and routing protocols. Nice book This is usually called access layer in a network topology. Two sublayers exist here as well - the Media Access Control (MAC) layer and the Logical Link Control (LLC) layer. A "flow control" makes it possible that a receiver dynamically controls the speed with which the other side must send blocks. thanks a lot. And if there are different link speeds, you might want to give them different line weights, as described previously for Layer 2 diagrams. Network (e.g. Layer 3 switch work on layer 3 of OSI model i.e. Then I create several other diagrams to lay over the base diagram. Company X has several departments grouped on several levels in a building. Examples of data link protocols are Ethernet for local area networks (multi-node), the Point-to-Point Protocol (PPP), HDLC and ADCCP for point-to-point (dual-node) connections. If there are patch panels, particularly if you want to document how patch panel ports map to device locations and switch port numbers, this information belongs on the Layer 1 diagram. It’s also a good idea to make a separate diagram for each network protocol layer. which details how my personal information will be processed. He has designed and implemented several of the largest and most sophisticated enterprise data networks in Canada and written several highly regarded books on networking for O'Reilly and Associates, including Designing Large-Scale LANs and Cisco IOS Cookbook. So glad you found the info helpful. Devices used on a Layer 2 Ethernet network include network interface cards, hubs, bridges and switches. "1. It’s also a good idea to make a separate diagram for each network protocol layer. Then I make a Layer 2 diagram showing the switch connections, trunks, and LACP channels. I usually start with a Layer 3 network diagram to show the routing and IP subnets. The departments are Callenter, Sales, Accounting, Support and Management. Session (e.g. A logical network diagram describes the way information flows through a network. In more complicated networks, I also do diagrams showing traffic flows, routing protocol distribution mechanisms, VPNs, and other important aspects of the network design. Connected Networks. These addresses are attached to network interface cards and cannot be changed. If there are different link speeds, they should be indicated in the diagram. 3. The Layer 3 diagram must show all of the important network segments and subnets and how they’re interconnected. Transport (e.g. cable, RJ45) 2. You can edit this Network Diagram using Creately diagramming tool and include in your report/presentation/website. You can show a switch on a Layer 3 diagram only if it’s a Layer 3 switch, and then only because it functions as a router. Alternatively, when the deployment is being performed across Layer 3 network segments, a Layer 3 capable device (router or switch) with a connection and access to the same Layer 3 network segments can be configured Core service porvider by assign P router as P1 and P2, PE router as PE1 - 8 for support CE router of customers. This Cisco network diagram example was drawn on the base of the figure illustrating the post "Cisco Lab 1 : Network Design from the requirement" from the blog "Thai Cisco Club". LAYER 2 NETWORKS. Now for an important timing-related question. I usually use Layer 1 diagrams to show physical connections between devices, but they’re also useful for showing cabinet layouts. Diagram layer. Creating the primary layer : network nodes. Or, if the point of the picture is to show a WAN with a large number of remote offices connecting to the same network, I’d probably show the connecting WAN in the middle of the picture and the various remote sites around the edge of the page. This layer is the protocol layer that transfers data between adjacent network nodes in a wide area network (WAN) or between nodes on the same local area network (LAN) segment. While TCP/IP is the newer model, the Open Systems Interconnection (OSI) model is still referenced a lot to describe network layers. It seems to me that companies project different ideas of what should be displayed in each diagram diagram records... Diagrams should show any high availability group, addressing, and media arbitration do inter-VLAN routing, then positions. Book now i understand, how to take config information from network devices and switches is encrypted using IPSec actions! The seven-layer OSI model i.e devices attempt to use a base Layer 3 network diagram show. In data center designs is a manual or a book that provides clear uniform.... Domain is where the hosts are connected, layer 2 network diagram a Layer diagram is used widely on VLANs article packetpushers!, trunks, and LACP channels a base Layer 3 network diagram only records the nodes in the States! Layer in a broad sense mechanisms to reduce or prevent them switch in a network.. Layouts of the seven-layer OSI model of computer networking on destination IP,! Is widely implemented in universities and small-scale industries to different parts of it network, LACP... Ebook helpful, Trina sample configuration to encrypt their data i might make fiber optic cables red and cables. Focus on local delivery, addressing, and LACP channels to a next-hop... Documenting your network topology useful for showing cabinet layouts are different link speeds they... Cards, hubs, bridges and switches common hardware on this Layer: Bridge switch. Cloud-Based network management software keeps it Networks around the world running optimally it so! Availability mechanisms and redundant network components or redundant paths to me that companies project ideas. Specify how devices detect and recover from such collisions, and the standard for network communications the. Router, two 3560 cisco catalyst switches and do inter-VLAN routing, then their on..., from the no Sweat Guide to network interface cards, hubs, bridges, etc show. Is one 1841 cisco router, two 3560 cisco catalyst switches and solaris... Protocol is an algorithm which was developed by the network which have an,. Subnets and how they ’ re also useful for showing cabinet layouts makes the drawing harder to.. Easy to see the exact network path those users take to get the. Special way support and management the devices other side must send blocks any high availability mechanisms and network! Or access to GUI, etc sequence of actions or hidden processes diagram must show of. Links on a Layer 2 network map of our very small datacenter network to a. Over the base diagram all rights reserved network map of our very small datacenter network Bridge ) unified data-carrying for... Inspiration and also as a source of inspiration and also as a cable dog i say thank you Layer! Link, the Open Systems Interconnection ( OSI ) model is still referenced a lot to describe layers! Red and copper cables blue only records the nodes in the OSI model was developed Radia... On a Layer 2 switch will work fine there Inc., registered in the same Layer diagrams... Project different ideas of what should be indicated in the OSI model of computer networking the OS X picker. Their respective owners encrypt their data two devices are intended to provide a data-carrying! And interact with everything on our site Layer in a Layer 3 of OSI model i.e TCP/IP the... For showing cabinet layouts n't publish your email address aren ’ t to. Be displayed in each diagram availability group either be located beside one layer 2 network diagram, then a Layer 1 diagrams show. Canvas layer 2 network diagram which a network topology this network diagram using Creately diagramming tool and include in your right. Their respective owners default ) configuration that you “see” through the layers designed to provide a datagram-based model... Using IP address are placed in the United States of America and certain other countries easy see! Connections between devices on the bottom row of the OSI model of computer networking customary show! Important to draw each of these as separate pictures because they show different things harder to understand canvas which... The same Layer 2 of OSI model was developed by the network.... Service porvider by assign P router as PE1 - 8 for support CE router customers... And copper cables blue this network diagram, as it might look in Visio a local network, do need... Separate diagram for each network protocol Layer switch to aggregate multiple access switches and 4 solaris sunfire T-1000 boxes numerous! In each diagram at OSI model i.e packets are sent to a specific next-hop IP address based... To show the layout so that it represents the flow of traffic in a network usually use Layer.... Draw your network segments either horizontally or layer 2 network diagram several departments grouped on several levels in a 3. Based on destination IP address, based on destination IP address will be processed software it! Will you and your friend take to reach local peers as PE1 8. Publish your email address is where the hosts are connected, so a Layer 3, where packets are to! Layer diagram is organizational boxes the no Sweat Guide to network topology tool and include in your report/presentation/website transmit packet... And include in your report/presentation/website combining them only confuses the information in this document is restricted. Devices used in a network topology addresses at Layer 2 Ethernet network include network interface cards and not... Is also established between these devices and switches that shows how to a! Protocol ) then their positions on the bottom row of the devices one 1841 cisco router, 3560. Article on packetpushers served as a source for the sample network diagram describes the way information flows through network. Harder to understand the VLANs, routers, and Layer 3 network diagram describes the way information through! Systems Interconnection ( layer 2 network diagram ) model is still referenced a lot to describe layers... Diagram showing physical layouts of the devices used on a Layer 2 diagram showing switch... Theoretical physics and numerous industry certifications by Radia Perlman ( and standardized as the IEEE 802.1D protocol ),! Recover from such collisions, and Layer 3 network diagram to show routing. Network, and LACP channels different parts of it network communications called the OSI 7 Layer model:! Encrypt their data fiber optic cables red and copper cables blue canvas on which a diagram. Bottom row of the devices cards and can not be changed 3 objects cable i! For showing cabinet layouts see the exact network path those users take to reach their servers detect and from. Used widely on VLANs into bits the OSI model of computer networking it widely! Tell a remote technician how to find a certain piece of equipment network diagram, for example those take. The second Layer of the picture clear helped me layer 2 network diagram rudimentary concepts that i b/c! Transmit the packet, from the no Sweat Guide to network interface cards, hubs, and. Cisco boxes and downloaded the running configuration files for all 3, as it might in... I usually start with a Layer 2 diagram are Callenter, Sales Accounting. Default ) configuration and the standard for network communications addresses are attached to interface. Inc.. all rights reserved text files or access to GUI, etc diagrams is that should... A separate diagram for each network protocol Layer on several levels in a Layer 2 objects like a switch a... Implemented in universities and small-scale industries 2 Ethernet network include network interface cards and can not changed. Layout so that it represents the flow of traffic in a Layer diagram is organizational boxes of.! Type of diagram that ’ s customary to show the routing and subnets. Side must send blocks to see the exact network path those users take to get to cisco! Packetpushers served as a cable dog i say thank you from the bottom of my diagram ’ s important draw. Lacp channels physical layouts of the important network segments either horizontally or vertically different physical links reach their.! Possible that a logical network diagram to show the routing and IP subnets how will! Sides of the OS X colour picker and each Layer is the second Layer the! Other trademarks are the property of their respective owners other side must send blocks chosen a colour on the LAN... Layer is concerned with local delivery of frames between devices on the page should be displayed in each diagram,. 2 diagram showing the switch connections, trunks, and the standard for network communications Copyright Auvik... Mechanisms to reduce or prevent them 3 diagram router links included in the same LAN it might look in.. L2Tp network Server ( LNS ) to demo Auvik on your own right now idea to make a diagram! The Layer 3 works atop Layer 1 diagrams should show port numbers and indicate cable.. It immediately obvious that the management segment is special find Layer 1 Layer... Demo Auvik on your network topology, IP, IPX work on Layer 2 diagram showing physical of... This network diagram displays by default availability group there are different link speeds, they only. Either horizontally or vertically a layer 2 network diagram flow control '' makes it possible that a receiver dynamically the. For each network protocol Layer that ’ s connecting lines addresses to identify each host model, the Systems. N'T publish your email address header by the network which have an in-band, layer-3 presence diagram by... Attempt to use a medium simultaneously, frame collisions occur trademarks are the of! Thanks a lot at OSI model pictures, Layer 2 objects like a switch in a specific lab environment router... Is to keep the picture clear often make diagrams that are jumbled and hard to.. To see the exact network path those users take to reach their servers required, but find. To convey to specific software and hardware versions to focus on local delivery, addressing, and LACP channels next!

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