Layer 2 Vs Layer 3 Network Diagram

Responsible for logical addressing and routing ip icmp arp rip igrp and routers. I usually start with a layer 3 network diagram to show the routing and ip subnets. Since vlans exist in their own layer 3 subnet routing will need to occur for traffic to flow in between vlans.

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A layer 2 switch works with mac addresses only and does not care about ip address or any items of higher layers.

Layer 2 vs layer 3 network diagram. Then i make a layer 2 diagram showing the switch connections trunks and lacp channels. A layer 3 switch is a specialized hardware device used in network routing. The image below shows an example of a multi vlan environment on a layer 2 switch. Some advantages of layer 2 include lower costs only requires switching no routing gear is necessary and offers very low latency.

Layer 2 vs layer 3 switch. After that comes a layer 1 diagram showing physical layouts of the devices. For network engineers and architects understanding the difference between a layer 3 and layer 2 network can greatly enhance the overall security and speed of your network infrastructure. It s also a good idea to make a separate diagram for each network protocol layer.

The below diagram shows the operation of the inter vlan routing with the layer 3 switch in combination with the l 2 switch. This is where a layer 3 switch can be utilized. In a university the pc s of faculties staff and students are connected via l 2 and l 3 switches on a different set of vlan s. These comparisons are based on the original seven layer protocol model as defined in iso 7498 rather than refinements in the internal organization of the network layer.

The link layer corresponds to the osi data link layer and may include similar functions as the physical layer as well as some protocols of the osi s network layer. Also logical diagrams are in many cases more valuable than. The main difference between layer 2 and layer 3 is the routing function. Most of the time i m facing situations where a customer doesn t have any logical network diagrams to give.

This is also the biggest difference lies between layer 2 switch and layer 3 switch. L3 diagrams are vital for troubleshooting or for planning changes. Pros and cons of layer 2 vs layer 3. Let s go through it with the help of an example.

So many issues can arise with layer 2 and they are much harder to troubleshoot than layer 3 issues. The biggest single problem i m seeing when working on enterprise networks is the lack of l3 logical network diagrams. Data center network design options layer 2 core vs layer 3 core in my experience if you have the choice always go with layer 3. Layer 3 switches technically have a lot in common with typical routers and not just in physical appearance.

A layer 3 switch is basically a switch that can perform routing functions in addition to switching. Both can support the same routing protocols inspect incoming packets and make dynamic routing decisions based on the source and destination addresses inside. Generally speaking layer 2 is a broadcast media access control mac mac level network while layer 3 is a segmented routing over internet protocol ip network.