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EVPN vs VPLS: What Are They? What Are Their Differences?

2018-07-25 12:19:08 | Switch

EVPN and VPLS are two technologies that provide Ethernet multipoint services over IP/MPLS networks. And as everyone knows, VPLS has been available and widely deployed for many years. EVPN, however, is a new upcoming technology which is considered to be a more efficient and feasible alternative to VPLS. Even so, someone still configure VPLS on their networks and use it to good effect. Then what’s exactly the difference between EVPN and VPLS? Which one is better? This post will focus on EVPN and VPLS tutorials, and discuss EVPN vs VPLS differences.

EVPN vs VPLS: What Is VPLS?

VPLS, be short for virtual private LAN service, is a telecom carrier-provided service. It enables customer to create a logical LAN structure between geographically separate sites. Actually, VPLS creates a virtualized data switch at the service provider, which links multiple remote sites together as if they were connected to a same physical switch. This helps a lot in simplifying network deployment and management, especially for data center interconnection.

EVPN vs VPLS-VPLS

EVPN vs VPLS: What Is EVPN?

Like VPLS, EVPN also provides virtual multipoint bridged connectivity between different Layer 2 domains over IP/MPLS backbone network. it is typically composed of customer edge (CE) devices (host, router, or Gigabit Ethernet switch) and provider edge (PE) routers. The PE routers often include an MPLS edge switch (MES) such as a 10GbE switch, which acts at the edge of the MPLS infrastructure. The following is a typical EVPN deployment. Traffic from data center 1 is transported over the service provider’s network through MES1 to MES2 and then onto data center 2. DCS1, DCS2, DCS3, and DCS4 are the data center switches.

EVPN vs VPLS-evpn

EVPN vs VPLS: What’s the Difference?

As mentioned above, EVPN is a more recent technology which aims to overcome the challenges VPLS meets. So it is more advanced in the following aspects:

EVPN vs VPLS - Signaling Protocols

VPLS features two kinds of signaling protocols: LDP and BGP. EVPN, however, adopts BGP as the only one service signaling protocol.

EVPN vs VPLS - CE Multihoming

VPLS only implements single-active solutions. EVPN implements two CE multihoming solutions: single-active (one active, N standby) and all-active (with known uni-cast per-flow load balancing).

EVPN vs VPLS - MAC Learning

VPLS only supports data-plane MAC learning on its local Attachment Circuit (AC), which can easily lead to stale forwarding state. EVPN also performs data-plane MAC learning on its local AC, but it relies on control-plane MAC learning between PEs. This will reduce unknown uni-cast flooding and implement a flush mechanism in BGP.

Will EVPN Replace MPLS?

Though EVPN has much advantages than MPLS, it doesn’t mean it’s the best solution for everything. For example, VPLS is much less consuming in terms of control plane and it uses up more service MPLS labels than EVPN. In these circumstances, EVPN will not replace MPLS. EVPN vs VPLS, which will you choose for your network?

Originally published at http://www.fiber-optic-transceiver-module.com/evpn-vs-vpls-whats-the-difference.html
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AC Switch vs DC Switch: What's the Difference?

2018-07-18 16:27:39 | Switch

The first step on integrating a switch into the network is to get it powered up. And as to power supply, there are AC and DC power for network switch, both of which are used for increasing network uptime. Then what’s the difference between AC power Switch and DC power switch? Which type shall we used for our network? This post will give a detailed introduction for the difference between AC Switch and DC switch, and set out how to make a proper decision over AC Switch vs DC Switch.

AC Switch vs DC Switch: What Are They?

AC powered Ethernet switch often has a fixed AC power supply connector, thus it generally gets powered up through power cables such as IEC power cord, NEMA power cord, etc. PoE switches are typical AC switches. Take FS 24 port PoE switch as example, which is equipped with a single 100-240V AC power supply connector (as shown below). It is easy to power up AC switch. All you need to do is connect it to the power socket with proper power cable. For some advanced network switch, turning on its power switch is also necessary.

AC switch vs DC switch

DC powered Ethernet switch can be configured with an internal or external DC power supply. And the external DC power supply is more popular nowadays, which is also known as redundant power supply. Modern fiber switch often has more than one redundant power supply (e.g the following FS 10GbE switch is equipped with two DC power supply). Except for powering up switch, the DC redundant power supply can also protect other power supply when it fails with shorted outputs.

AC switch vs DC switch

AC Switch vs DC Switch: What's the Difference?

In the market, there are Ethernet switches that support only AC power supply or DC power supply, and there are also some switches which can be used with both AC and DC power supplies. However, the switch can only support one type of power supply at the same time. That’s to say, if you use DC power supply to power up your switch initially, the switch will detect it and operate with DC power. In this case, AC power supply installed in the switch will be disabled. Even if you try to install AC power supply when the switch is operating with DC power, it will also disable the AC power and generates an alarm. So remember not to mix AC and DC power supplies in a switch.

Conclusion

AC and DC power supplied Ethernet switches are all commonly used nowadays. You can select one or the other according to your own case and needs. FS provides both AC and DC switches. For example, we have AC switches such as 8/24/48 port PoE+ Managed Switches which support up to 600W. High quality DC switches are also available. Customers can also custom the power type of switches.

Originally published at http://www.fiber-optic-transceiver-module.com/ac-switch-vs-dc-switch-whats-the-difference.html

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VLAN vs Subnet: What Are Their Differences?

2018-07-12 09:58:01 | Switch

VLAN and Subnet are both developed to deal with segmenting or partitioning a portion of the network. And they also share such similarities as restricting broadcast domains or ensuring security through isolation of different sub-networks. However, there are obvious differences between them on operation, functionality and deeper objectives. This post will focus on VLAN vs Subnet: what's the difference?

VLAN vs Subnet: What Are They?

Subnet is a small network composed by a group of IP addresses. It is part of a larger network. Any IP address within the same Subnet can communicate with each other without using routing devices. To be clear, we can think Subnet as the department of a company, people in the same department can talk freely without going out of their department. If you want to reach a address outside of your Subnet, you will have to go through a router or modern Gigabit Ethernet switch with router functionality. Since Subnet is related to IP address, it often works at layer 3.

VLAN, also known as virtual LAN, is a group of devices on one or more LANs in regardless of physical location. That’s to say, it allows devices to be grouped together even though they are not connected on the same fiber switch. However, it often requires the network hardware/software to support VLAN functionality, for example, VLAN switch is essential for setting up a VLAN network. In VLAN, configuration of the network can be done via software extensively. Basically, VLANs are used at layer 2 to break up broadcast domains.

VLAN vs Subnet: What’s the Difference?

As mentioned above, VLAN and Subnet are totally different things in a close look. The following chart lists the differences between VLAN and Subnet in details:

Parameter
VLAN
Subnet
Definition
VLAN is a logical LAN that contains broadcasts within itself, and only hosts belonged to that VLAN will see those broadcasts.
Subnet is an IP address range of IP addresses that help hosts communicate over layer 3.
Logical and Physical Network
VLAN allows us to create different logical and physical networks.
Subnet allows us to create logical networks through the same physical network.
Network Member Control
A VLAN is configured at server/router side. The one who controls the router/server decides which computer/port is assigned to which VLAN. For example, if you have a 24 port 10GbE switch, you can assign 12 ports to VLAN 1 and the others to VLAN 2.
A Subnet is determined by the IP you use and the IP can be chosen by the admin of a computer (or device). Therefore it is done on client side - you can not control it.
OSI Layer
VLAN is a layer 2 term where MAC addresses work.
Subnet is a layer 3 term where IP layer works.
Hardware/Software Based
More of software-based terminology.
More of hardware-based terminology.
Security & Control
VLANs perceived to be more secure and provide more robust control for the network.
Subnet has limited control in comparison to VLAN.
Major Benefit
VLAN is extremely flexible, it brings better work performance, less traffic, and more efficiency.
A Subnet will not be affected when other Subnets going down or having technical breakdowns.

VLAN vs Subnet: Which One Do You Like?

VLAN and Subnet both have their advantages and limits. For example, VLAN allows for creation of different logical and physical networks while Subnet only allows for creation of different logical networks. However, if a network sniffer is employed, users from one Subnet can discover the existence of other Subnets, this will not happen to users of different VLANs. So VLAN vs Subnet: which do you prefer?

Originally Published at http://www.fiber-optic-transceiver-module.com/vlan-vs-subnet.html

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8 Port PoE Switch Selection Guide And Tips

2018-01-19 17:30:26 | Switch

POE(Power over Ethernet) is ideal for using in smart applications which makes CCTV even more effective and easier to manage. The network can be monitored, controlled, and managed from a smartphone or tablet. With a POE switch such as the Netgear ProSAFE 8 port switch, remote IP surveillance cameras can be controlled and managed no matter where they are located. Facing the selection of 8 port PoE switch, most of people would occur allodoxaphobia. For fixing this hard-decision problem, this article would put emphasis on 8 port PoE switch selection guide and tips.

8 Port PoE switch-FS.COM

Overview on 8 Port PoE switch

There is a variety of 8 port PoE switches with different brands. Today, we would take FS.COM 8 port switch as an example to introduce 8 port PoE switches. FS.COM S1130-8T2F managed PoE+ switch comes with 8x 10/100/1000Base-T RJ45 Ethernet ports, 1x console port, and 2x gigabit SFP slots. It can supply power to network equipment such as weather-proof IP cameras with windshield wiper and heater, high-performance AP and IP telephone. This managed PoE+ switch are highly flexible, the transmission distance of the SFP fiber port can be up to 120km, and with high resistance to electromagnetic interference. It also features superior performance in stability, environmental adaptability. FS.COM PoE+ Gigabit switch comes with a one-year limited warranty, including any quality problems during the free maintenance. The detailed specification of FS.COM S1130-8T2F managed PoE+ 8 port switch is shown in the below.

8 port PoE switch price table

8 Port PoE switch Selection Guide & Tips
—Power Requirements

Review the data sheets of the camera’s you have specified on the installation to see if any have higher power requires known as PoE+. If you have 1 or more camera’s requiring PoE+ power you will need to heavily consider this when choosing your switch. (Please note PoE+ switches will happily power standard PoE devices but a standard PoE switch cannot power any PoE+ device, regardless of the amount of wattage unused by the other connected equipment). However some switches are designed to power both PoE and PoE+ devices, please check the specification sheet of that exact switch model to see if this is possible on your selection. If this is the case you will usually find a the switch will handle half the PoE+ devices. An 8 port switch can power 8 standard PoE devices or 4 PoE+ devices.

—Cable Run Length

Make sure when planning your network you do not have cable runs longer than 90 meters. This is particularly important when using PoE due to voltage drop. PoE is particularly hard to measure voltage on so if you break the 90 meter cable rule you could be in for a world of pain if devices do not operate correctly.

—8 Port Switch Price

There are many 8 port PoE switches of major brands on the market, such as Cisco, Netgear, HP, TP-Link and etc. The 8 port switch price varies in difference brands. But they all controlled in a certain range, it’s around $40~$300. For brand selection of 8 port PoE switch, that depends on your preference. You can check the price discrepancy with major brands in the following table. Notice: All the following prices except FS.COM are from Amazon.

FS.COM S1130-8T2F 8 port PoE switch

Conclusion

This article mainly introduce FS.COM S1130-8T2F 8 port PoE switch and provide 8 port switch selection guide and tips. How to choose a reliable supplier from so many 8 port switch manufacturers? Before buying 8 port PoE switch, the quality, power requirement, price, cable run length should be considered. As one of well-known 3rd-party optics manufacturers, FS.COM is suggested to be a good choice for 8 port PoE switch.

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Stacking Vs. Chassis Switch: How to Choose?

2017-11-03 10:38:13 | Switch

Maximizing scalability and optimizing performance are two paramount factors when you design or upgrade your network. It is hard to find the right balance. Given that you need more than 48 ports in a wiring closet, but you could not decide which type of switches to buy. Stacking switch or non-stacking switch? Or does a modular chassis solution make more sense? In this article, we would make a comparison between stacking and chassis access switches and guide you to make an appropriate decision.

Stacking Switches Solutions

Over the years, stacking network switches have been highly favored by lots of Ethernet users and been a core component of an enterprise-grade switch. So what is reason for the popularity of stacking switches? By using stacking switches, we can add ports as we need them by simply purchasing another switch and adding it to the stack. We can stack up to nine Cisco 3750-X switches and have 432 x 10/100/1000 ports and 18 x 10 Gbps ports. We can do this using only 9RU's of rack space. A chassis would require over double the rack space to achieve this access port density. This makes these switches very popular as top-of-rack switches in the data center.

brocad-stackable-switches

Figure1: Brocade Stackable Switches

Pros of Stacking Switches
  • Pay-as-you-grow
  • Small Physical Footprint
  • Convenient 100v Power Standard
  • Virtual Chassis Capability
  • Cross-Stack EtherChannel
Cons of Stacking Switches
  • Management Difficulties
  • Power Demands
  • Software Complexity
  • Instability
Chassis Switches Solutions

Chassis devices, often being "premier" devices, may offer software and/or hardware features unavailable on a stack. They are the flagship models of every vendor's switching line. In contrast to the fixed configuration switches, it is engineered to operate as single integrated system. Configuring high availability is simple and it works every single time. A failed line card will not bring down the entire chassis. Additionally, a chassis will drive consistency in deployment.

Cisco Chassis Switches

Figure2: Cisco Chassis Switches

Pros of Stacking Switches
  • Solid High Availability Features
  • Modular Design
  • Supports Wide Range of Line Cards
  • Simple to Deploy
Cons of Stacking Switches
  • Physical Space (twice the space of stacks)
  • Expensive Power Supplies
  • 220v Power for PoE Solutions
How to Choose?

Just as the same as the every comparison on the similar kits, the decision really depends on your actual requirements. Once we have this, finding the right hardware is very straightforward. It is important to balance the cost of acquisition versus the cost of operations and impact to the business due to outages. And that is what we always thinking about when we make a decision.

In this article, we mainly provide the detailed information about stacking and chassis switches solutions, and offer you relatively enough information to help you to make a decision on choosing the best switching solutions for setting up or upgrading your network. There are too many variables to give a one-size-fits-all recommendation, but in general chassis Ethernet switches' solutions are our preference. In addition, you should keep in mind that pricing should not be the focused too much. We can get both designs for a pretty reasonable price, regardless of requirements. If your network can benefit from both stackables and chassis, the chassis solution would be a good choice.

Originally published at http://www.fiber-optic-cable-sale.com/stacking-vs-chassis-switch-how-to-choose.html.

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