Dell EMC Networking Z9264F-ON review

Are you ready for 100-Gigabit Ethernet? Dell EMC’s Z9264F-ON certainly is the right one.

The migration of data centers from 40GbE to 100GbE is accumulating momentum and becoming mainstream, with port shipments expected to increase twice times next year. Dell EMC is a major player in this market, and in this exclusive review, we look at its new Z9264F-ON core switch, which is designed to provide low-cost, high-density 100GbE solutions to every port for businesses, data centers, and Tier1/2 cloud service providers.

Z9264F-ON is supported by Broadcom’s StrataXGS Tomahawk II ASIC, which compresses the impressive 64 100GbE QSFP28 ports into its low-key 2U chassis.

With a backplane capacity of 12.8Tb/sec, performance and port density are increased by a few times compared to the Dell EMC Z9100-ON introduced in 2016. Because Z9264F-ON is a multi-rate switch, it can use ports at maximum speed, and Dell EMC offers a variety of branch cable options. These allow switches to support up to 128 10/25/50Gbe links, as well as a series of QSFP+ transceivers that can be used to convert selected ports to 40GbE speeds.

Dell EMC Networking Z9264F-ON review: Open networking

“On” in the model name indicates that this switch is a fully paid member of the Dell EMC Open Network Club. Along with Dell EMC’s OS10 software, the switch can run a range of other operating systems, including Cumulus Linux and Big Switch Networks, and is about to launch a product that supports Pluribus Networks.

Cumulus Linux has been built as a data center-level network operating system from the start, running almost any Linux application you want.

For 0 contact configurations, Cumulus can use Ansible automation tools and their scripts and templates, or many other tools, including Puppet and Chef. Alternatively, you can use the big Switch Networks big Cloud Fabric to specify the switch. This changes Z9264F-ON to a true software-defined network (SDN) physical layer switch managed by a separate SDN controller.

Dell EMC Networking Z9264F-ON review: OS10 Enterprise Edition

Dell EMC’s own OS10 Enterprise Edition (OS10 EE) software provides all the traditional switching and routing capabilities without hidden costs.

It includes advanced L3 features, such as BGP Routing and OSPF as standards, rather than expensive optional additional features. OS 10 uses traditional CLI access, and so far Dell EMC has resisted the temptation to implement a Web GUI.

Because OS10 is a standard, unmodified Linux kernel, it also allows you to run certified automation tools such as Chef, puppet, ansible, and SaltStack. The switch supports up to 128 link aggregation groups (LAGS), each containing up to 16 ports for high-performance switch-to-switch links. Dell EMC’s VLT (virtual link relay) goes a step further because they allow two of switches to be placed in a high-availability domain.

In a VLT domain, both switches are active, they share the same virtual MAC address and if one goes down, the other assumes all primary functions and carries on regardless with no loss of service. The mVLT (multi-VLT) feature also allows LAGs to be used to create multiple redundant connections between logical VLT domains.

Dell EMC Networking Z9264F-ON review: Optic pricing

The Z9264F-ON undoubtedly delivers a big reduction in the cost per 100GbE port but it’s a shame Dell EMC can’t do the same with its 100GbE optics. The 100G SR4 850nm optic and its 100-meter reach have a list price of £3,313, while the full 100G LR4 optic increases the reach to 10kms but costs £15,490.

Looking back at our Z9100-ON review, we can see that the same SR4 and LR4 optics three years ago had list prices of just over £2,000 and £14,609 so they’ve actually increased in cost. True, you don’t have to use Dell EMC’s own optics – but it would seem sensible if the company had made them more competitively priced.

For direct 100GbE server-to-switch connections over short distances, it’s more cost-effective to use QSFP28 DAC (direct attach copper) cables. A 5-meter 100G DAC cable costs about £572, won’t require expensive optics at each end and uses a lot less power as well.

Dell EMC Networking Z9264F-ON review: 100GbE speed

For performance testing, we used two Dell EMC PowerEdge R640 1U rack servers equipped with dual Xeon Scalable Gold 6150 CPUs, plus 256GB of DDR4. Both systems were running Windows Server 2016 and equipped with QLogic FastLinQ QL45611H 100GbE HBAs cabled directly to the Z9264F-ON test switch over 100GbE links.

To generate the high throughput required to stress the 100GbE ports, we used the jPerf Windows app on both servers with one side configured as a server and the other as a client. We configured jPerf to test network throughput from the client to the server using 800 parallel streams back to the jPerf server.

After letting it settle for 15 minutes, we could see it recording a very impressive network throughput of up to 89Gbits/sec. From the switch’s OS10 CLI console, we pulled up interface statistics for both ports the servers were attached to. Whilst running jPerf, we could see the CLI registering a link utilization of around 89% for each 100GbE interface thus confirming our jPerf results.

Dell EMC Networking Z9264F-ON review: Verdict

With exponential growth forecast in the data center switching and routing market, the Z9264F-ON puts Dell EMC in a prime position. It delivers a wealth of 100GbE ports in a compact 2U form-factor allowing businesses to break away from expensive and often underutilized chassis-based solutions.

As one of the first blue-chip vendors to introduce open networking switches, it’s also uniquely positioned to offer more software choices than the competition and release businesses from vendor lock-in. Dell EMC also delivers on its promise to reduce per 100GbE port costs. When the 32-port Z9100-ON was released, its list price was a shade under £31,000, whereas the starting price for the 64-port Z9264F-ON is only around four grand more.


Chassis: 2U rack
Ports: 64 x 100GbE QSFP28, 2 x 10GbE SFP+
Backplane: 12.8Tbps full duplex
Forwarding capacity: 2,900 Mpps
Packet buffer: 42MB
CPU memory: 16GB
Power: 2 x 1600W hot-plug PSUs
Cooling: 4 x fan standard or reverse flow modules
Software: OS10.4.2 preinstalled

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