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  • GLink access switches (customer access)
    • Juniper QFX 5100s using 10 Gbps Ethernet
    • Each customer connects to an 'A' switch and a 'B' switch
      • All GLink switches are deployed in pairs
    • Each GLink switch is connected to three spines at 40 Gbps.  'A' feed Glink access switches do not connect to the 'B' feed spine, 'B' feed Glink access switches do not connect to the 'A' feed spine
    • Count:
      • 12 pairs of GLink switches
  •  Spine switches
    • Juniper QFX 5100s using a mix of 40 Gbps and 10 Gbps (legacy connectivity to distribution/WAN) 
    • Spine 'A' and Spine 'B' pass market data multicast traffic
    • Non multicast spines pass order entry (MSG/CGW) unicast traffic
    • Spine ‘A’ and Spine ‘B’ also pass non order-entry unicast traffic to services outside of Glink.  This class of traffic does not affect receipt of market data across multiple customer switches.
    • Count: 4 switches
  • MSG access switches
    • Juniper QFX 3500s 5100s using 10 Gbps Ethernet for gateway connectivity
    • Each MSG access switch is connected to the 2 non-multicast Spine switches at 40 Gbps
    • MSGs connect to only one gateway access switch at 10 Gbps. Fault tolerant pairs should be on separate switches
    • Count: 4 switches
  • CGW access switches
    • Juniper QFX 3500s 5100s using 10 Gbps Ethernet for gateway connectivity 
    • Each CGW access switch is connected to the 2 non-multicast Spine switches at 40 Gbps
    • Count: 2 switches
  • WAN distributions (to the left and right of the spines)
    • Switches using 10 Gbps Ethernet connectivity
    • Each WAN distribution is connected to all four spines
    • Market data routes through this distribution layer into the 'A' and 'B' spines
    • Count: 2 switches

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