Broadcom unveils 25G Ethernet, SDN optimized chip

Broadcom unveils 25G Ethernet, SDN optimized chip

Cloud-scale switches based on Broadcom Tomahawk should emerge soon from vendors

Broadcom this week announced availability of new Ethernet switch silicon optimized for cloud-scale data centers.

Broadcom's StrataXGS Tomahawk chipset is built on the company's widely deployed StrataXGS Trident and StrataDNX products. Tomahawk delivers 3.2Tbps switching capacity -- 32 100G ports -- and SDN-optimized engines in a single chip, Broadcom says, and features all-25Gbps per-lane interconnect, enabling transformation to 25G and 50G Ethernet networks.

Broadcom was one of the founders of the 25 Gigabit Ethernet Consortium, a group of vendors and users looking to promote standardization of the 25/50G Ethernet speeds and product development. The IEEE also recently formed a 25G study group based on industry interest in the Ethernet spec.

By deploying Tomahawk-based switches, data center networks currently running 10G at the top-of-rack, or leaf, level and 40G at the end-of-row spine can upgrade to 25G and 100G interconnect to accommodate growth in distributed server/storage workloads without increasing network equipment footprint, Broadcom says. And instead of upgrading server-to-switch connections to 40G, a Tomahawk-based network driving 25G to the server reduces cabling elements within the rack by as much as 75%, while quadrupling the number of server and storage nodes that can be interconnected in a leaf-spine topology, Broadcom claims.

For SDNs, Tomahawk also incorporates application flow and debug statistics, link health and utilization monitors, streaming network congestion detection and packet tracing capabilities to provide the telemetry network operators require to troubleshoot large-scale networks, tweak performance and respond to potential problems, Broadcom says.

Tomahawk also includes packet processors for user configurable flow processing, security, network virtualization, measurement/monitoring, congestion management and traffic engineering, with in-field configurable forwarding and classification database profiles. These capabilities are accessible to the network control plane via common software APIs, Broadcom says.

Other SDN features of Tomahawk include OpenFlow 1.3+ support, VXLAN, NVGRE, MPLS, and Shortest Path Bridging overlay and tunneling support, and policy enforcement for existing and new virtualization protocols.

Port-to-port latency for Tomahawk is in the sub 400ns range, Broadcom says. The chipset also supports RoCE and RoCEv2 storage/RDMA protocols.

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