Author Archives: Kelly.Zeng

10G SFP+ and 25G SFP28 Compatibility Analysis

In recent years, data centers are expanding at an unprecedented pace to drive the need for increasing bandwidth between the server and switches. 10GbE is not adequate bandwidth for today’s networks. There’s a tendency that 25GbE (based on SFP28) is on route to displace 10GbE (based on SFP+) from its leading role as the work horse in networking construction. As this transition takes place, questions about SFP+ and SFP28 compatibility arise for anyone who’s planning to upgrade the 10GbE to the higher and faster 25GbE. This post will provide a thorough presentation to 25GbE and clarify the compatibility issues between 10G SFP+ and 25G SFP28.

What Is 25G and Why Do We Need It?

25G Ethernet was based on the IEEE 802.3by standard and released in 2016. 25GbE specification makes use of single-lane 25 Gbps Ethernet links, providing a simpler path to future Ethernet speeds of 50 Gbps, 100 Gbps and beyond. By offering the advantages listed below, 25GbE is gained more and more momentum among service providers and data centers.

Backward Compatibility With 10GbE

The high performance 25G chips use single-lane 25G serdes technology similar in operation to 10GbE, supporting technology advancements from 10G in packaging and silicon. 25GbE allows existing switch architectures to support link speeds faster than 10G with no increase in cable/ trace interconnect.

Faster Network Performance

The 25G Ethernet based on the SFP28 form factor delivers 2.5 times more performance and bandwidth compared to 10G speeds. It also provides easy migration path to 50GE (2x25GE) & 100GE (4x25G), laying a path to higher networking speeds like 200G and 400G.

Significant Cost Benefits

25GbE delivers 2.5 times more data vs. 10GbE, thus reducing the power and cost per gigabit significantly. This power savings will in turn result in lower cooling requirements and operational expenditure for data center operators.

Available 25G Optical Modules and Cables

Every new Ethernet speed has gone through multiple pluggable form factor migrations to achieve higher density and lower power consumption goals. For instance, 10G moved successively to the X2 and XFP form factors before finally converging on the SFP+ form factor that allows for up to 48 ports per 1U. Similar form factor transitions happened for 40G (CFP to QSFP) and 100G (CFP, CFP2, CFP4 and QSFP), in achieving the highest density and lowest power. With the release of the 25GbE specification, 25 Gigabit Ethernet equipment is available on the market using the SFP28 form factors. For optical modules, FS offers cost-effective 25GBASE-SR, 25GBASE-LR, and 25G CWDM SFP28 transceivers to cut your hardware costs. For short-haul transmission, 25G SFP28 DAC (direct attach cable) and 100G QSFP28 to 4x SFP28 AOC (active optical cable) in various lengths are also available for all needs and specifications.

25G SFP28 DAC and AOC

10G SFP+ and 25G SFP28 Compatibility

With 10G and 25G Ethernet equipment coexisting on the market today, we may frequently encounter the compatibility issues related to SFP+ and SFP28 form factors. Anyway, the newer 25GbE technologies are backward compatible with 10GbE, allowing customers to build and cross-connect a heterogeneous-speed Ethernet network. Here we list the frequently asked questions coming through average customers.

1.What is the difference between SFP28 and SFP+?

The pinouts of SFP28 and SFP+ connectors are mating compatible. However, SFP+ is designed to operate at speed up to 10 Gb/s whereas SFP28 can handle 25Gbps, 10Gbps and even 1Gbps. SFP28 has increased bandwidth, superior impedance control and less crosstalk than the SFP+ solution. Besides, the SFP28 copper cable has significantly greater bandwidth and lower loss compared to the SFP+ version.

2.Can the SFP28 be used in SFP+ slot, and what speed will I get?

Theoretically, plugging an SFP28 transceiver or cable into the 10G interface is feasible for certain devices to get 10Gb/s data rate, but this solution is not recommended, because it would be limited by the NIC and switch port that you have. Only when your SFP28 module is 100% compatible with your server or switch can you ensure that the links can go seamlessly and efficiently.

3.Can the SFP+ be used in SFP28 slot, and what speed will I get?

Theoretically, plugging an SFP+ transceiver or cable into the 25G SFP28 slot is feasible. But you also need to make sure ensure that your existing modules will be compatible with your switch gear. That is to say, although a switch that accepts the SFP28 form factor can physically accept a SFP+ connector in the same port, it doesn’t mean that your SFP+ modules will work on your equipment.

Note: When shopping for new 25G leaf switches, if you have SFP+ modules you want to use, look for switches that accept the SFP28 form factor, which is physically capable of taking existing SFP+ modules. The same holds true for QSFP+ modules and QSFP28 ports. Carefully read the product specs to ensure that your existing modules will work with your new equipment.

Conclusion

As the majority of 25G switches and network interface cards offer backward compatibility to 10G, there is lots of flexibility to manage a gradual migration to higher speed servers and mix and match port speeds. Theoretically, all SFP28 based 25G ports on switches and 25G NICs can be used at 10G speed via port self-negotiation, but the premise should be that your existing modules are compatible with the NIC and switch port that you have. With a minimal premium for 25G based systems compared to 10G systems, it becomes a wise choice to deploy 25G capable systems to realize the performance advantages for migrations & future proofing initiatives.

Related Article:
10G – 25G – 100G Network Upgrade: An Inevitable Roadmap for Future Data Centers
FS 25G Portfolio for Data Center 25G/100G Leaf-Spine Network

How to Mount a Network Switch to a Rack?

A network switch has been recognized as one of the most important devices for today’s networking technology. It allows simultaneous transmission of multiple packets and partition a network more efficiently than bridges or routers. The rack mount switch can be installed in a standard 19-inch equipment rack or on a desktop or shelf. So how do you mount a network switch to a rack to establish network wiring connections? Here’s a step-by-step guide to teach you how to mount a network switch to a rack.

Preparations Before Mounting the Network Switch

Before rack mounting the switch, please pay attention to the following factors:

  • Location: The site should be at the center of all the devices you want to link and near a power outlet, so that it is accessible for installing, cabling and maintaining the devices in the rack.
  • Temperature: Since the temperature within a rack assembly may be higher than the ambient room temperature, check that the rack-environment temperature is within the specified operating temperature range (0 to 40 °C).
  • Mechanical Loading: Do not place any equipment on top of a rack-mounted unit.
  • Circuit Overloading: Be sure that the supply circuit to the rack assembly is not overloaded.
  • Grounding: The switch rack should be properly grounded.

How to Mount a Network Switch to a Rack?

Step1. Attaching the Brackets to the Switch

Attach the brackets to the network switch using the screws provided in the mounting accessory.

network switch to rack

Step2. Installing the Switch in the Rack

Mount the switch in the rack with the optional rack mount kit, usually using the rack-mounting screws. Be sure to secure the lower rack-mounting screws first to prevent the brackets being bent by the weight of the switch.

switch rack

Step3. Adding Other Switches into the Rack

If there is only one data switch to be installed in the rack, then you can make the connection to a power source now. If there are multiple switches to be mounted, you need to install the another switch on the top of the first one in the rack, and then attach the power cords.

Step4. Attaching the Power Cords

After you complete mounting all of the switches in the rack, it’s time to connect the switch rack to the power source. Remember to verify that you have the correct power supply (AC-input or DC-input and the correct wattage) for your configuration.

Caution: To prevent bodily injury when mounting or servicing the switches in a rack, you must take special precautions to ensure that the system remains stable. The following guidelines are provided to ensure your safety:

  • This network switch should be mounted at the bottom of the rack if it is the only unit in the rack.
  • When mounting the switch in a partially filled rack, load the rack from the bottom to the top with the heaviest component at the bottom of the rack.
  • If the rack is provided with stabilizing devices, install the stabilizers before mounting or servicing the switches in the rack.

Establishing Network Wiring Connections

After mounting your network switches to a rack, you can establish the network wiring connections according to your requirements now. If you’re using a Gigabit Ethernet switch, it can be connected to 10, 100 or 1000Mbps network interface cards in PCs and servers, as well as to other switches and hubs. It may also be connected to remote devices using optional SFP transceivers. No matter which type of network switches you are using, make sure that they are securely mounted in the rack and connected to the corresponding networking wiring systems.

Proper Horizontal Cable Management for Rack

Cable management is a critical part of network cabling systems that require a large number of moves, adds and changes. The improper cable management may result in cable damage or cause transmission errors and performance issues as well as system downtime. In a horizontal manager system, the cable management for rack is important in telecommunications rooms for leased office space, brokerages and trading houses where the workstations will move or add additional ports frequently. This post will analyze why the horizontal rack cable management is important and offers FS horizontal cable management solutions for rack.

Why Is Proper Horizontal Rack Cable Management Important?

  • Poorly routed cables can lead to an assortment of problems over time. Jumbled cables would increase the risk of cables to be tangled up, and a possibility of interruption when reconnecting the cables.
  • The rack cable management is directly related to hardware safety. All equipment running on the server rack is going to generate heat, so organizing a rack with a conception involving space will help promote the airflow and hardware management.
  • Cable labels in a proper horizontal rack cable management can save a lot of time on troubleshooting. Just imagine how difficult it would be to trace a cable through that mess.
  • If rack cables were unorganized, a technician would spend hours tracing wires when something goes wrong. In most circumstances, we can’t afford to stay offline while a technician unravels a tangled nest of cables. Thus a proper horizontal cable management makes it easy for the technician to identify and access where goes wrong and fix it in far less time.

Horizontal Cable Management for Rack: Where to Start with?

Horizontal cable management system is often installed within racks or cabinets to manage cables on front racks and draw cables away from equipment neatly. The rack space of a horizontal cable management infrastructure is typically 1U or 2U high. The following part gives the FS plastic & metal horizontal fiber patch panel, cable managers, lacer panels to promote a proper cable management in your horizontal network cabling systems.

Horizontal Rackmount Fiber Patch Panel

Horizontal rackmount fiber patch panels help to organize cables and eliminate cable stress for your rack enclosure cabinet. FS offers 1U 19’’ blank rackmount fiber patch panels with plastic D-rings on the cable management panel and lacing bar. These rackmount fiber patch panels can be used to organize cables for fiber optic adapters, fiber enclosures, Ethernet switches, WDM chassis, etc.

ID 59576 72910
FS P/N FHD-1U-CMP300 FHD-FPP5DRL
Fiber Counts Max.96 Fibers Max.96 Fibers
Material Metal (SPCC) Metal+Plastic
No. of D-rings 5 (Metal) 5 (Plastic)
Detachability Yes (with Screws and Tools) Yes (Without Tool)
Horizontal Cable Managers with Finger Duct & Brush Strip

Horizontal cable managers with finger duct and brush strip allow neat and proper routing of the patch cables from equipment in racks and protect cables from damage. Fixed inset fingers on the front and back allow easier access to the ports for moves, adds, and changes. And the brush strip horizontal cable manager is constructed of high-quality steel with high-density nylon bristles, which can promote proper airflow through the rack and meet the demand for front-to-back cable runs.

ID 29038 29040 29039 68690 29033
FS P/N CMH-SFD1U CMH-DFD1U CMH-SFD2U CMH-4DRB1U 1U-BR-CMP
Material Plastic Plastic Plastic Metal (SPCC) Metal (SPCC)
Style Finger Duct Finger Duct Finger Duct Brush Strip & D-rings Brush Strip
Cable Capacity 44(Cat6) 44(Cat6) 100(Cat6) 100(Cat6)
Horizontal Lacer Panel with D-rings

Horizontal lacer panels are efficient tools for rack or enclosure cabling. These D-rings on the lacer panel are essential to avoid cable strain and prevent damage to the ports on your rack-mount equipment. The five rotating D-rings can be easily assembled or disassembled manually according to your needs.

ID 64457 72911
FS P/N FHD-1U-CMP100 FHD-CMP5DR
Style D Rings Plastic D Rings
Number of Rings 5 5
Material Metal (SPCC) Metal+Plastic
Detachability Yes Yes

Conclusion

This post provides users with a horizontal cable management solution that simplifies cable routing in a finished professional appearance. With proper and efficient horizontal cable management tools, cable spaghetti is not a problem anymore. You can just have a peace of mind and reap the great benefits of sound cable management. FS horizontal cable management tools provide an efficient way to manage high performance copper, fiber optic, or coaxial cables on any 1U or 2U rack. For more details, please kindly visit www.fs.com.

Related Article: FS.COM 1U Cable Management Solutions Guide

Related Article: Selecting the Right Horizontal Cable Manager

Cloud Computing vs Big Data: What Is the Relationship?

Cloud computing and big data are two of the most trending terms in the ever-lasting IT sector nowadays. You may think that they both do the same thing but actually, both of them have their own ways to work to perform. Cloud computing vs big data, what are they? What is the relationship between them?

cloud computing vs big data

Cloud Computing Tutorial

Cloud computing is a technology used to store data and information on a remote server rather than on a physical hard drive. It uses the servers hosted on the Internet to store, manage, and process data, rather than a local server or a personal computer. It means accessing resources of organization from any remote location in the world. In simple term accessing RAM, HDD, Processor of organization’s server from laptop, desktop from any of the location where Internet is available.

what is cloud computing with example

As shown in the figure above, cloud computing is collection of different services, providing services to end user via the Internet. Services like storage, virtual desktop applications, Web/App hosting process power from servers. In the following architecture, the infrastructure built to provide services is called cloud computing. This infrastructure from where the services gets accessible is front end.

Big Data Wiki

The term big data is very popular nowadays, representing huge sets of data that can be further processed to extract information. Big data carries hidden patterns and algorithms which are unlocked by using various tools available in the market. These data sets are further analyzed to provide business insights. Big data is all about storing and processing of data that is exponentially growing these days. Giants like Google, Facebook are having their own data centers to keep track and to secure their users’ data. That’s also why many big companies are equipped with reliable network equipment (including the server, router or fiber switch) for data storage or traffic forwarding in their data centers. For high performance and cost-effective enterprise routers, Gigabit Ethernet switch and 10gbe switch, FS is a case in point.

what is big data technology

Big data requires a large amount of storage space. While the price of storage continued to decline, the resources required to leverage big data can still pose financial difficulties for SMBs (small to medium sized businesses). A typical big data storage and analysis infrastructure will be based on clustered network-attached storage (NAS). Clustered NAS infrastructure requires configuration of several NAS pods with each NAS pod comprised of several storage devices connected to an NAS device. The series of NAS devices are then interconnected to allow massive sharing and searching of data.

Key Comparisons Over Cloud Computing vs Big Data

The cloud computing works in a consolidated manner, while the big data comes under the technology of cloud computing. The crucial difference between cloud computing vs big data is that cloud computing is used to handle the huge storage capacity to provide various flexible and techniques to tackle a magnificent amount of the data. While big data is the information processed with cloud computing platform. The following chart gives a more detailed comparison over cloud computing vs big data.

Cloud Computing Big Data
Basic On-demand services are provided by using integrated computer resources and systems. Extensive set of structured, unstructured, complex data forbidding the traditional processing technique to work on it.
Purpose Enable the data to be stored and processed on the remote server and accessed from any place. Organization of the large volume of data and information to the extract hidden valuable knowledge.
Working Mode Distributed computing is used to analyse the data and produce more useful data. Internet is used to provide the cloud-based services.
Benefits Low maintenance expense, centralized platform, provision for backup and recovery. Cost effective parallelism, scalable, robust.
Challenges Availability, transformation, security, charging model. Data variety, data storage, data integration, data processing, and resource management.

Cloud Computing vs Big Data: They Work Hand in Hand

Both cloud computing and big data are good at their marks. Cloud computing vs big data: they differ from each other but work hand in hand. They are the perfect combination for data storage and processing. The cloud computing has been a precursor and facilitator to the emergence of big data. If big data is the content, then cloud computing is the infrastructure.

VLAN Configuration Guidelines on Layer 3 Switch

As networks grow larger and larger, scalability becomes an issue. Every device in the network needs to send broadcasts to communicate in a broadcast domain . As more devices are added to the broadcast domain, more broadcasts start to saturate the network. In this case, VLAN (Virtual LAN) is needed to separate broadcast domains virtually, eliminating the need to create completely separate hardware LANs to overcome this large-broadcast-domain issue. In this post, we’re gonna expound the motivators to deploy VLAN and how to set up VLAN configuration step by step.

VLAN Configuration

Motivators to Implement VLAN

VLAN is a way of creating multiple virtual switches inside one physical data switch. There are a lot of reasons to implement VLAN, some of which are listed as follows.

  • Link Utilization: Link utilization is another big reason to use VLANs. Spanning tree by function builds a single path through your layer 2 network to prevent loops. If you have multiple redundant links to your aggregating devices then some of these links will go unused. To get around this you can build multiple STP topology with different VLANs.
  • Service Separation: If you have IP security cameras, IP Phones, and Desktops all connecting into the same switch it might be easier to separate these services out into their own subnet. This would also allow you to apply QoS markings to these services based on VLAN instead of some higher layer service. You can also apply ACLs on the device performing Layer 3 routing to prevent communication between VLANs that might not be desired.
  • Subnet Size: If a single site becomes too large you can break that site down into different VLANs which will reduce the number of hosts that see need to process each broadcast.

VLAN Configuration Guidelines on Layer 3 Switch

Configuring two or more VLANs to communicate with each other requires the use of either a VLAN-aware router or a Layer 3 switch. VLAN configuration can be accomplished either in CLI interface or in Web interface. The following video is a VLAN configuration example on FS S5800/S5850 10 gigabit switch.

Configure VLAN in CLI (command-line interface)

Here we take FS S5850-32S2Q Layer 3 switch as an example to configure VLAN. To create a VLAN via CLI interface, SecureCRT software is required to enter CLI interface, then perform the VLAN configuration command in the chart below:

Procedure Command Purpose
Step 1 Set the parameters of COM2 port Quick connect on startup
Step 2 #enter Enter CLI interface
Step 3 #configure terminal Enter the global configure mode
Step 4 #vlan database Enter VLAN configure mode
Step 5 #show vlan all Check the details of all VLANs on the switch
Configure VLAN in Web Interface

Configuring VLAN in Web Interface is quite simple. Just perform the following two steps and you would see the basic info of the VLAN that is created.

Step 1: Log in the Web user interface using the account and password

Step 2: Find the service management and create a new VLAN, and set its ID as 10 or 20.

Note: Ports configured to use VLAN 10 act as if they’re connected to the exact same switch. Ports in VLAN 20 can not directly talk to ports in VLAN 10. They must be routed between the two or have a link that bridges the two VLANs

Summary

VLAN deployments make it easy for network engineers to partition a single switched network to match the functional and security requirements of their systems without having to run new cables or make major changes in their current network infrastructure. The proper VLAN configuration on Layer 3 switches ensures reliable and secure data link access to all hosts connected to switch ports. Knowing more about VLAN configuration would allow you to use them when you need them and to use them correctly when you do.

Related Article: Voice VLAN Configuration Guidelines on Ethernet Switches

Related Article: VLAN: How Does It Change Your Network Management?

Related Article: QinQ vs VLAN vs VXLAN