Dune

Introduced March 15, 2015

Press release

Summary from Packet Pushers

Strata DNX Family – Dune.

Used for higher cost devices with more demanding needs.

  • 800 Gbps of packet processing
  • HQOS, external packet buffers and advanced packet processing.
    • QumranMX BCM88370 – A single-chip switch delivering 800 Gbps Ethernet for compact carrier Ethernet and data center top-of-rack switches
      Introduced November 2016 to backfil product offering
      • QumranAX/BCM88470 300 Gb/s diagram
      • QumranUX/BCM88270 120 Gb/s
    • Jericho BCM88670 – A 720 Gbps packet processor and traffic manager with DNX fabric interfaces for carrier Ethernet switch router, data center chassis, and enterprise campus applications
    • Jericho+ BCM88680 – A 900 Gbps packet processor and traffic manager with DNX fabric interfaces for carrier Ethernet switch router, data center chassis, and enterprise campus applications. This part first mentioned in 2017 and not from the Packet Pushers summary.
  • Up to 800 Gbps forwarding capacity per device
  • Advanced, flexible and configurable packet processor
  • Integrated accelerators for carrier service management
  • Carrier feature support including Ethernet OAM, MPLS, VPLS
  • Integrated hierarchical traffic manager with support for thousands of flows
  • External packet buffer memory supporting DDR4 or GDDR5 DRAM
  • Data center virtual network tunneling including VXLAN, NVGRE and Geneve
  • Support for 10 GE, 25 GE, 40 GE, 50 GE, 100 GE Ethernet port interfaces
  • Support for 200G-400G Interlaken™ port interfaces
  • IEEE 1588 network timing engine
    • BCM88770 – A high density switch fabric device providing 3.6Tbps throughput per device enabling over 100Tbps switching capacity in a single stage system when combined with BCM88670
  • Chassis switch fabric supporting 3.6 Tbps per device
  • Single-stage interconnect for up to 144 BCM88670 devices
  • Dual-plane Ethernet/optical switch fabric
  • Backwards compatible to legacy DNX switch fabric chipsets

    --------------------------

    Some 2017 additions to the family that are targetted at the network edge.

    • BCM88476 - A 300 Gbps packet processor and traffic manager including StrataDNX fabric interfaces compatible with BCM88750 and BCM88770 Fabric Elements, plus external packet buffer and table expansion. (.Kalia.)

    • BCM88470 - A single-chip packet processor and traffic manager delivering 160 to 300 Gbps of Ethernet capacity with external packet buffer and table expansion. (.Qumran-AX.)

    • BCM88270 - A small footprint single-chip packet processor and traffic manager delivering 30 to 120 Gbps of Ethernet capacity with external packet buffer expansion. (.Qumran-uX.)

    • From Cisco Presentation at Tech Field Day June 12, 2019

    Jericho Jericho+ Jericho2 Jericho2c Jericho2c+
    Bandwidth 720G 900G 4.8T 2.4-3.0T 14.4T
    Network Interface 24x25G+36x12.5G 48x25G+24x12.5G 96x50G 32x50G+96x25G 144x50G
    Fabric Interface 36x25G 48x25G 112x50G 48x50G 192x50G
    Power 120W 150W 300-350W 150-200W 350W
    Geometry 28 nm 28 nm 16 nm 16 nm 7 nm
    Jericho2c+ is not part of the Cisco presentation from 2019. It was introduced in Sept 2020. Jericho2 has 16 nm geometry and Jericho2c+ has 7 nm. This explains the increase in power efficiency.

    Perhaps this table should also include Qumran 2C. At the September 2019 regional OCP conference Carsten Michel (Deutsche Telekom) presented on new switches designed to fill the BNG (border Network Gateway) slot. These switches -- one leaf, one spine -- will use the Qumran 2C when it becomes available. Meanwhile, Delta is building prototypes with the Jericho 2C which is a pin-for-pin equivalent except that the latter has a fabric interface that is not needed here.

    Buffering

    Cisco has prepared a series of youtube videos and PDFs that explain Dune internals. The first one of these covers the basics. The youtube presentation date is March 27, 2019. The others are good, too. Of special interest, if you're smart about how you organize your FIB the external TCAM models are not needed to carry full routes. The second video covers how the buffer works in a large test bed.