How to Configure Inter VLAN Routing on Layer 3 Switches?

With the development of technology, no matter how far you are away from families, you can communicate with them at any time in any places. The same is true to the optic communication, regardless of the physical locations of two hosts or the different VLANs they belong to, they can exchange with each other by inter VLAN routing. Then what is inter VLAN routing and how to configure inter VLAN routing on layer 3 switches?

What Is Inter VLAN Routing?

In figure 1, three computers connected to a gigabit Ethernet switch form a LAN (local area network) within a limited area. However, they cannot communicate with hosts in another LAN, because there is no connection between these Ethernet switches. Then there comes the VLAN which provides us with logical separation or segmentation of our networks to facilitate communication among hosts in different LANs. However, each VLAN is a unique broadcast domain, so computers on separate VLANs are unable to communicate with each other by default. There is a way to solve the problem, and that’s what we are going to shed light on—inter VLAN routing.

LAN and VLAN in NetworkingFig. 1 LAN and VLAN in Networking

The process of forwarding network traffic from one VLAN to another VLAN using routing is known as inter-VLAN routing. One of the ways to carry out inter-VLAN routing is by connecting a router to the switch infrastructure. When using a router to facilitate inter-VLAN routing, the router interfaces can be connected to separate VLANs. Devices on those VLANs communicate with each other via the router. Apart from that, a more convenient way is introduced—configure inter VLAN routing on layer 3 switches. Layer 3 switching is more scalable than a router which only provides a limited number of available ports.

How to Configure Inter VLAN Routing on Layer 3 Switches?

To enable a layer 3 switch to perform routing functions, the switch must have IP routing enabled. 10gb Ethernet switch and 40gb Ethernet switch are recommended for working as layer 3 switch.

Inter VLAN Routing

Fig.2 Inter VLAN Routing on Layer 3 Switches

In figure 2, layer 3 switch is configured with IP address 10.0.0.1. VLAN10 and VLAN20, with IP address 10.10.10.10 and IP address 10.20.20.20 respectively are configured on layer 2 switches. These two IP addresses will be the default gateway addresses for hosts belonging to VLAN10 and VLAN20 on the layer 2 switches respectively. Also, all interfaces connecting the three switches must be configured as trunk ports to allow VLAN10 and VLAN20 tagged frames to pass between switches. Traffic between VLAN10 and VLAN20 will be routed by the layer 3 switch after configuring inter VLAN routing. These steps can be achieved by VLAN configuration command below.

Create VLANs 10 and 20 in the switch database

inter VLAN routing configuration 1
Assign port Fe0/1 in VLAN 10 and port Fe0/2 in VLAN 20

inter VLAN routing configuration 2

Create trunk port Fe0/24

inter VLAN routing configuration 3

Enable layer 3 routing and create VLANs 10 and 20 in the switch database

inter VLAN routing configuration 4

Create trunk ports Fe0/47 Fe0/46

inter VLAN routing configuration 5

Configure Switch VLAN Interfaces (SVI) to acts as a virtual layer 3 interface on the layer 3 switch

inter VLAN routing configuration 6

Conclusion

VLAN is created to enable the communication among hosts in different LANs. Inter VLAN routing is developed to realize the exchange among hosts in different VLANs. Inter VLAN routing on layer 3 switch without a router is also approachable with the development of technology. For more configuration about network switches, please refer to our website www.fs.com.

Gigabit PoE Switch vs Normal Switch

The telecommunication industry has always been developing with leaps and bounds and technology changes with each passing day. For common people with few network knowledge, the evolving optional network devices like PoE switch can be a big puzzle. What is PoE? What is the distinction of gigabit PoE switch vs normal switch? Read this article for reference.

What Are PoE and PoE Switch?

PoE, abbreviation of Power over Ethernet, is a technology that enables Ethernet cable to supply power. Thus power sourcing equipment (PSE) can transmit both data and power to powered devices (PD) simultaneously via one single cable. PoE has two standards available on network switch: IEEE 802.3af/at. The former orginal PoE standard is defined in 2003, which provides 15.4 W power budget to PDs (12.95 W available for accessing). The latter PoE+/PoE Plus standard defined in 2009 provides up to 30 W (25.5 W) power.

PoE switch is one of the two types of PSE for PoE implement: endspan switch and midspan PoE injector. To enhance network resiliency, gigabit PoE switches provided by FS.COM are highly compatible IEEE 802.3af/at managed PoE+ switches. For example, S1130-8T2F managed gigabit 8 port PoE switch with 2 SFP ports can connect to gigabit Ethernet network while S1600-48T4S 48 port PoE switch can use the SFP+ ports to connect with 10gbe switch for higher performance data transfer.

S1130-8T2F 8 port PoE switch

Figure 1: FS S1130-8T2F 8 port PoE managed switch can be flexibly placed in a rack, on a wall or on desktop.

PoE Switch vs Normal Switch: What’s the Difference?

In a word, PoE switch and normal switch differ from PoE accessibility. A regular Ethernet switch is not PoE enabled to supply power for end users over Ethernet. Therefore the user requires one extra cable to connect power outlets. However a normal switch can also become PoE ready by employing a midspan injector between the switch and PDs. The injector will add electrical power while receiving data signal from Ethernet switch end cable, and then deliver both data and power to PDs. But in this circumstance the injector also needs a wire for power. When using gigabit PoE switch, only one power cable is required. Then the PDs can be directly plugged into the PoE gigabit switch port for both data transmission and power supply. The illustration and table below list the differences of employing PoE switch vs normal switch while adding PoE to network.

gigabit PoE switch vs normal switch

Figure 2: An illustration of deploying PoE gigabit switch vs normal switch when adding PoE to network.

PoE Switch Normal Switch
Required Accessories Easy for management (power and transmission) Require separate two wires for powering on normal switch and PoE injector
PoE Access Method Upgrade to PoE network by replacing the normal Ethernet switch with PoE Ethernet switch Install PoE injector between switch and PDs to add PoE capability to the existing non-PoE switch
Emergency Reaction Potential chance of the whole system’s outage Only one device be affected
What Are the Advantages of PoE Switch?

As mentioned above, PoE switch differs from normal switch for supplying power to PDs in the meantime of data delivery. Though the normal switch system can also acquire PoE by installing injector, PoE endspan has the superiority of direct Power over Ethernet ability. Counting to this, gigabit PoE switch owns edges over normal switch as follows. First, it enables PDs like IP surveillance cameras to be placed almost anywhere: on the ceiling, concealed in a wall, or even underwater while only one cable is needed to run to them. Second, it saves extra expanse and time for power cabling and injector installation. Third, with simplified cabling of all PDs directly connected to gigabit PoE switch, the data center is easy for management and control. Besides, PoE gigabit switch itself is designed with advanced features like high-performance hardware with software, auto-sensing PoE compatibility, strong network security and environmental adaptability.

Conclusion

Gigabit PoE switch can supply power to PDs in the meantime of data transmission via one single Ethernet cable while normal switch can only send data to them. For PoE implement, normal switch requires a power-on auxiliary injector as midspan between switch and powered devices. Thus PoE switch owns advantages of direct PoE connection, easy and flexible placement, cost-efficiency, simplified management and etc. For any applications of IP surveillance cameras, VoIP phones and wireless APs, PoE switch over normal switch is a good solution to go.

How to Add PoE to Your Network?

In data centers, there are a lot of electrical devices and each one requires a power supply cable and at least one connection wire for transmission. It’s a disaster to see all those wires scattering all over the floor and tangling together. To introduce Power over Ethernet technology, we can cut down the number of wire drops and simplify the management control. So what’s the practical methods for adding PoE to your network? Read the following passage, to learn about the two solutions: adopting PoE switch or PoE injector.

Overview of PoE Implement Method

PoE requires PoE-enabled networking devices for power supply on the Ethernet cable. To realize this technology, there are two types of power sourcing equipment (PSE) for adopting: endspan (IEEE 802.3af refers to it as “endpoint”) and midspan. Endspan is an Ethernet switch that has built-in PoE data transmission circuitry. A midspan is an intermediary device between a non-PoE switch and powered devices (PD). Thereinto PoE injector is a frequently used available external midspan device.

Adding PoE by PoE Switch (Endspan)

When you need to set up a new Ethernet network with power over Ethernet technology or you want to upgrade system and replace older non- PoE switches, employing endspan is a good choice. How to add PoE to your network by PoE switch? Just connect it to other network devices, and the switch itself will figure whether they are PoE supportable devices and control power automatically. There are various types of PoE switch available, ranging from “dumb” unmanaged one, smart partly managed one and fully managed one with advanced management. It is also various from port quantity, such as 8, 16, 24 and 48 port.

It is noted that the PoE+ switch is a PoE plus switch for providing up to 30W power consumption. For example, FS S1130-8T2F 8 port PoE switch is a managed PoE+ switch with 2 SFP port, IEEE 802.3at complied and IEEE 802.3af backward compatible. It has maximum power supply of 130W and switching capacity of 20Gbps. FS S1130-8T2F supports various PoE devices and is best fit for network equipment such as wireless APs, IP phones and weather-proof IP cameras.

Adding PoE by PoE Injector (Midspan)

If you don’t want to discard your already used network switch and only PoE capability is needed to be added, you can simply adopt midspans. PoE injector is a device that can add electrical power while receiving signal from one end of the cable, and then deliver both the data signal and the power via the other end of the cable. Instead of PoE switch, midspan can also be used as an economical and functional solution where only a few PoE ports are in demand. How to add PoE to your existing LAN by PoE injector? First, power on PoE injector and non-PoE Ethernet switch respectively, next connect them via an Ethernet cable. Then connect PDs such as IP phones with PoE injector and finally the system can run as a whole.

In the case of older end devices are not PoE-ready, a splitter can be helpful for adding PoE to your network. To apply a splitter onto the end of the Ethernet cable will enable signal and power to be split into two different lines.

PoE switch vs PoE injector installation

This figure shows the installation of PoE switch vs PoE injector for adding PoE to network.

PoE Switch or PoE Injector: Which to Employ?

After diving into each respectively, we made a comparison of PoE switch vs PoE injector for concerning about adding PoE to network.

PoE Switch PoE Injector
Price Higher Cost Economical
Management and Control Easy for management (power and transmission) Requiring separate two wires for powering on switch and PoE injector
Implement Method Upgrade to PoE network by replacing the old Ethernet switch with PoE switch Install PoE injector to add PoE capability to the existing non-PoE switch
Emergency Reaction Potential chance of the whole system’s outage Only one device be affected

For most concerns about cost-efficiency and PoE capability required, you can go for PoE injector. However, for upgrading system and future-proof superior functionality concern, PoE switch is obviously a better choice.

Conclusion

Both PoE switch and PoE injector are power sourcing equipment for adding PoE to a network. PoE switch is an endspan, naturally fitting for new set-up or upgrade-needed network. PoE injector is a midspan, better fitting for existing non-PoE network without switch replacement requirement. For PoE switch purchase, FS.COM is a reliable vendor providing a wide rage of types for different demands. Any other information to know, just visit our official website and blog.