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What Is Multilayer Switch?

by Antra Kamble

Are you familiar with the term called multilayer switch? We know that there is an increase in the diversity of network applications all over the globe. These switches are growing rapidly in data centers and networks. In my article, I will share all the necessary information about these switches. I have also shared some important features of these switches. They are regarded as a technology to enhance the network routing performance in LANs. Continue reading to get a clear explanation of the multilayer switch and how to use it.

What Is A Multilayer Switch?

A multilayer switch is a network device that enables operation at multiple layers of the OSI model. They can perform the functions of a switch as well as a router at incredibly fast speeds. These switches forward the data packets based on the Layer 2 information like media access control (MAC) addresses. As this switching technology developed, more higher-level functions were added. For example, the ability to look deep inside packets for information.

Usually, an MLS has a 10gbe switch and a Gigabit Ethernet switch. By the way, the OSI has seven layers in it. This includes the Physical Layer, Data Link Layer, Network Layer, Transport Layer, Session Layer, Presentation Layer, and Application Layer. So, the MLS performs its functions mostly in the application layer i.e. Layer 7. This switch can do the context-based access control, which is the primary function of later 7. Besides, the Layer 3 switch is the most commonly used multilayer switch.

Cisco offers multiple varieties of multilayer switch models. These switches are designed according to their structure. On the lower end, there are the single rack unit (1 RU) models that are designed for wiring closets and small installations. Some of these switches can be stacked in several ways depending on the model.

How To Use A Multilayer Switch?

You have to follow three main steps to configure this switch. Continue reading to know more about it.

Preparation

  • To start, determine the number of VLANs that will be used, and the IP address range (subnet) of each VLAN.
  • Next, identify the addresses that will be used for the default gateway and DNS server within each subnet.
  • Determine if you are going to use DHCP or static addressing in each VLAN.

Configuration

You can now start the multilayer switch configuration by using the following steps.

  • Enable routing on the switch with the help of an IP routing command.
  • Next, you can log into the MLS management interface.
  • Finally, create the VLANs in the MLS and assign ports to each VLAN.

Verification

In the end, you still need to offer a snapshot of the routing table entries. You have to list a summary of an interface’s IP information and status.

Multilayer Switch Features

Below I have mentioned down some important factors of these switches.

Feature Description
Easy to use Usually, MLS are configured automatically. Its Layer 3 flow cache is set up automatically. You no longer need to learn new IP switching technologies for its plug-and-play design.
Faster Connectivity In an MLS, you can gain the benefits of both switchings and routing on the same platform. This can meet the higher performance needed for the connectivity of intranets and multimedia applications.
Transparency They require no end-system changes and no renumbering of subnets.
Standard Based It uses IETF2 standard routing protocols such as OSPF and RIP for route determination. You can also deploy MLS in a multivendor network.
Investment Protection You are free to use MLS with your existing framework and models. While MLS allows you to use either an integrated RSM or an external router also.
Resilience This particular feature enables the switches to transparently switch over the Hot Standby backup router. It helps to eliminate network failure.
Access Lists This feature allows you to set up an access list to filter or prevent traffic between members of different subnets.
Accounting And Traffic Management They allow you to see data flows as they are switched for troubleshooting, traffic management, and accounting purposes.
Fast Convergence It allows you to quickly respond to route failures and routing topology changes.
Network Design Simplification This enables you to speed up your network while retaining the existing subnet structure.

Multilayer Switches Examples

Below I have sorted out the best multiple switches for you.

  • Cisco Catalyst 9400 Series MLS
  • Cisco Catalyst 9300 Series MLS
  • Cisco Catalyst 9200 Series MLS
  • Cisco Catalyst 4500 Series MLS
  • Cisco Catalyst 3650 Series MLS

Multilayer Switch Vs Router

However, you may find three key differences in MLS vs routers. Continue reading to know more about it.

  • Firstly, MLS route packers on Application Specific Integrated Circuit (ASIC) hardware. While routers typically use software to the route.
  • Another main difference is that MLS route packets faster than routers.
  • Lastly, the MLS lacks some Quality of Service (QoS) features. However, routers support numerous different WAN technologies.

Multilayer Switch Vs Layer 2 Switch

In simple words, the Layer 2 switch forwards data packets based on the Layer 2 information and can inspect frames. However, these switches work exactly like the Layer 2 switches but it has a routing function as well. This includes static routing and dynamic routing.

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FAQ

What Are The Advantages Of Multilayer Switching?

The advantages of this switching are as follows.

  • It provides high-speed scalability with low latency.
  • It helps to move traffic at wire speed.
  • MLS also provides layer 3 routings.

What Is The Main Difference Between A Layer 2 Switch And A Multilayer Switch?

The main difference between a layer 2 switch and an MLS is as follows.

  • In simple words, the Layer 2 switch forwards data packets based on the Layer 2 information and can inspect frames.
  • However, an MLS works exactly like the Layer 2 switches but it has a routing function as well.

Do I Need Layer 3 Switching?

Yes, you do need a Layer 3 switch for improving switching performance. Sometimes, it is optional as Layer 3 switches act as switches and routers. Generally, they are ideal for VLANs only, as they do not have a WAN interface.

What Is The Difference Between A Layer 2 Switch And A Layer 3 Switch?

The difference between a Layer 2 switch and a Layer 3 switch is as follows.

  • A Layer 2 switch only works with media access control (MAC) addresses. They don’t interact with any higher layer addresses such as IP addresses.
  • While a Layer 3 switch does static routing and dynamic routing, which includes IP and VLAN communications.

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Conclusion

Thus, a multilayer switch provides high functions in networking. The MLS is the network device that forwards the data packets based on Layer 2. They inspect the deeper into the protocol description unit. In these switches, higher-level functions are also added such as the ability to look inside packets for information. Generally, they use ASIC hardware circuits to perform routing functions. In short, you can say MLS has become the device that examine Layer 2 through Layer 7. In my above article, I have explained the term multilayer switch you should know.

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