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Managing Cloud Complexity

Fabric wars: Cisco vs. Brocade vs. Juniper

Avaya, Enterasys, HP and Alcatel-Lucent also in fabric mix

By , Network World
November 02, 2011 06:06 AM ET

Network World - The past three years have been very noisy on the data center fabric and architecture front. Every quarter seems to bring about a new convergence blueprint from another vendor - and a variety from one or two.

Fibre Channel over Ethernet (FCoE) is being pushed hard by Cisco. It consolidates server adapter ports by tunneling FCoE instead of requiring a separate Fibre Channel network.

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FCoE with Cisco's FabricPath lossless Ethernet software on the company's Nexus switches forms the network backbone. But Cisco is also looking to unify compute and storage with the network through its Unified Computing System (UCS), which includes Cisco blade servers with memory extensions to accommodate a high number of virtual machines and their service profiles.

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FCoE is a standard, but FabricPath and UCS are Cisco-specific innovations. Cisco says FabricPath supports the IETF's TRILL method for solving scalability problems in data center networks, but is also a "superset" of it.

Brocade has some FCoE products but is not as bullish as Cisco on the technology. That's because Brocade has the lion's share of the Fibre Channel SAN market - it would lose Fibre Channel revenue to Cisco, which has 65% or more of the Ethernet switching market, if the FCoE market takes off.

Brocade also claims its BrocadeOne architecture is standards-compliant in that it also supports TRILL and the IEEE's Data Center Bridging standard for lossless Ethernet. Its fabric element is Virtual Cluster Switching (VCS), which was developed to provide a lossless, low latency, deterministic multi-path Ethernet network.

BrocadeOne seeks to transform physical data center assets and resources into virtual services allocated via software commands rather than physical relocation or deployment of systems.

Juniper's QFabric seeks to flatten and simplify data center networks to accommodate growth of devices and applications, virtualized servers and storage, and cloud-enabled on-demand access to virtualized pools of IT resources. With QFabric, switches and routers that make up a data center network or interconnected data center networks behave as one logical switch or router, meaning applications are no more than a hop away from requester and server.

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The QFabric network, in Juniper's view, is a single-tier construct that eliminates two of the three layers - access, aggregation and core - of the data center network.

Juniper eschews TRILL for this purpose in favor of its own technology, which is based on the company's Virtual Chassis scheme. Virtual Chassis combines physical switches into a single logical device.

Indeed, Juniper has been outspoken in its aversion to TRILL, with CTO and Founder Pradeep Sindhu called it "a solution looking for a problem" and "a joke" for data center networks.

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