• All Categories

  • Solutions

  • About Us

Networking / Network Switch / FS 25G Portfolio for Data Center 25G/100G Leaf-Spine Network

FS 25G Portfolio for Data Center 25G/100G Leaf-Spine Network

Posted on By FS.COM

FS 25G Portfolio for Data Center


FS 25G Portfolio for Data Center 25G/100G Leaf-Spine Network

25G Ethernet is a standard for Ethernet connectivity, which is developed by IEEE 802.3 Task Force P802.3by. Looking back at the evolution of Ethernet standard, 40G and 100G standards have long been active in the market since 2010, while 25G standard was not introduced until 2016. It seems that 25G standard is a step backward, as 40G and 100G already exist. But in fact, the emergence of 25G standard indicates that the market needs a cost-optimized solution for server-to-switch connectivity.

Why Use 25G/100G Leaf-Spine Network in Data Center?

With the rapid expansion of data centers, faster speed and higher bandwidth are required between servers and switches. 10G is not fast enough, while 25G can provide 2.5 times the performance of 10G as well as offers higher bandwidth at the same power consumption. Then why use 25G rather than 40G? Compared to 40G, 25G can provide a higher port density with maximum switch I/O performance and fabric capability. When data center operators apply 25G based server, 25G offers the benefit of re-using the same server rack designs and works with the same cabling infrastructure, so the only associated cost is that of upgrading the network equipment. In addition, most switch silicons that support 25G and 100G are backward compatible with 10G and 40G speeds, providing great flexibility to mix and match port speeds with a gradual migration to higher speed servers.

What Is 25G/100G Leaf-Spine Network and How to Design It?

25G/100G Leaf-Spine network architecture contains two layers — the spine layer and the leaf layer. The spine layer is the backbone of the network, where every leaf switch is interconnected with every spine switch. The leaf layer consists of 25G access switches that connect to devices such as 25G servers, firewalls, and edge routers. In cloud and hyper-scale data centers, the Leaf-Spine network can create a fast, predictable, scalable, and efficient communication architecture for data center switches. When designing a Leaf-Spine architecture, there is one important factor to consider—oversubscription ratio. It is the ratio between downlink ports (to servers/storage) and uplink ports (to spine switches). Generally speaking, a 3:1 oversubscription rate between leaf and spine layer is deemed acceptable.

Leaf-Spine architecture

FS Provides A full 25G Portfolio for 25G/100G Leaf-Spine Network Deployment

Since the introduction of 25G Ethernet, its low-cost and high-efficiency advantages have been favored by many cloud computing providers. Therefore, many suppliers provide a variety of 25G products. FS is one of the first suppliers to offer a complete range of 25G products. The 25G products are available in switches, modules, cables, etc. Now we will introduce a series of FS 25G products to guide your purchase.

Leaf-Spine deployment

N8500-48B6C 25G Leaf Switch

N8500-48B6C switch is an SDN (Software Defined Network) switch that delivers excellent low latency and power efficiency in a PHYless design while offering high-reliability features. It comes pre-loaded with Cumulus system to provide users with a highly flexible, scalable and programmable network. The price and warranty are also the key points for N8500-48B6C to stand out from other switches. It offers a cost-effective price (nearly half of others) with a five-year warranty (4 years longer than others), and FS global warehousing system enables fast delivery.

25G Leaf Switch

25G Server Adapter

25G server adapter (PCI Express x8 Dual Port SFP28, US$345) based on Intel XXV710® chipset, is compatible with PCIe x16 slot. It delivers excellent performance for 25GbE connectivity that is backward compatible with 1/10GbE, making the migration to a higher speed easier.

25G Server Adapter

25G Fiber Transceivers

For connections between leaf switches and servers, FS offers 25GBASE-SR, 25GBASE-LR, and CWDM SFP28 25G fiber transceivers. For all those transceivers, FS provides a lifetime warranty to ensure product quality and the transceivers are all compatible with famous brand companies such as Cisco, Arista, Brocade, Mellanox, Generic etc.to satisfy all your needs.

25G Fiber Transceivers

25G DAC/AOC Cables

For the cabling solution, FS provides 25G SFP28 DAC cables for short transmission distance (≤5m), 25G SFP28 AOC cables for longer transmission distance (up to 30m). In addition, FS supplies 100G QSFP28 to 4x25G SFP28 DAC/AOC cables for you to achieve direct connections between spine switches and servers. They are the ideal cables for the interconnection of switches, routers, storage devices, and servers.

25G DAC/AOC Cables

FAQs on FS 25G Products for 25G/100G Leaf-Spine Network

FS provides a wide variety of 25G portfolio for 25G/100G Leaf-Spine network deployment. For your better understanding, we gather some frequently mentioned questions for your reference when purchasing them.

Why should I trust FS compatible direct attach cables?

Besides the price advantage we have compared to branded cables, FS DACs also maintain the same performance and reliability. To satisfy our customers' needs of high performance, all of our DACs are tested multiple times in mainstream original brand switches in our test center before shipped out. What's more, using compatible optics in brand devices will not negatively affect manufacturers' warranty if that's your concern.

Can I connect switch-to-server using copper cables for under 5 meters?

Yes. FS provides SFP28 DAC copper cables for server-to-switch connectivity under 5 meters.

What kind of cables should I use for the distance longer than 5 meters?

FS offers SFP28 AOC cables or SFP28 modules with LC cables for distance longer than 5 meters.

Can I have different compatibilities for each end of my direct attach cables?

Yes. FS supplies customized dual compatibility solutions for direct attach cables so that you can choose compatibilities for each end individually. All you need to do is to select "Dual Compatibility Solutions" option in Compatible Brands drop-down box and note down your devices' model numbers in the custom page.

Does FS provide customized Arista Networks 25G DAC cables?

Yes. FS provides cost-effective customized 25G DAC cables compatible with major brands like Cisco, Arista, Juniper, Mellanox, Generic etc.

What cables lengths does FS offer for 100G QSFP28 to 4x25G SFP28 Passive Direct Attach Copper Breakout Cables?

FS offers 100G QSFP28 to 4x25G SFP28 Passive Direct Attach Copper Breakout Cables in 1m, 2m, 3m, 5m and inquiries for customized length are also welcomed.

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

Yes. SFP28 is backward compatible with SFP+ ports and will work sufficiently. But SFP+ is designed to operate at 10Gb/s instead of SFP28 at 25Gb/s. Therefore, you will get 10G.

Does FS offer 25G CWDM 80km modules?

No. FS currently provides 25G CWDM modules with wavelength from 1270nm to 1330nm of 10km.

What is the maximum power consumption of FS QSFP28-LR4-100G transceivers?

The maximum power consumption of FS QSFP28-LR4-100G transceivers is 3.5W. If it draws greater than 3.5W, FS can not guarantee the performance since there are other dependencies like airflow direction, ambient temperature, elevation and etc.

Which single-mode 100G QSFP28 module that is compatible with Arista can be used to break out 100G in 4x25G lanes?

Among the 100G QSFP28 modules, FS recommends QSFP-100G-PSM4 to meet your needs.

Can FS 100G QSFP28 to 25G SFP28 module support Juniper devices?

Yes. FS 100G QSFP28 to 25G SFP28 modules not only support Juniper devices but also support other major brands like Cisco, Arista, Dell, Mellanox, Generic, Extreme, etc.

Does FS provide 25G modules that support both Arista and Mellanox switches?

Yes. FS provides 25G modules that can support both switches, for example, SFP-25G-SR.

Does FS offer 25G BIDI modules?

No. FS offers 25G CWDM 10km modules that function the same as 25G BIDI modules.

Can N8500-48B6C 25G switch support otu4 channelization on the 100G interfaces?

Yes. This N8500-48B6C can support otu4 channelization on the 100G interfaces for sure.

Can N8500-48B6C 25G switch operate at 10/25 for the SFP ports and 40/100 for the QSFP ports?

Yes. This switch supports up to 48 x 10/25 GbE and 6 x 40/100 GbE connections.

Do FS 25G/100G switches support VXLAN with MP-BGP EVPN control plane?

Yes. FS N-Series bare-metal switches such as N8000-48B6C and N8500-32C can support EVPN. And the switches come pre-loaded with Cumulus system can also support EVPN.