Figure 25. QSFP28-DD connection between MX9116n FSE and MX7116n FEM
Note: Compute sleds with dual-port NICs require only MX7116n FEM port 1 to be connected.
Besides fabric-expander-mode, QSFP28-DD port groups support the following Ethernet
breakout configurations:
• 8x 10GbE – Breakout a QSFP28-DD port into eight 10GbE interfaces
• 8x 25GbE – Breakout a QSFP28-DD port into eight 25GbE interfaces
• 2x 40GbE – Breakout a QSFP28-DD port into two 40GbE interfaces
• 2x 100GbE – Breakout a QSFP28-DD port into two 100GbE interfaces
By default, QSFP28-DD port groups 10 through 12 are in 2x 100 GbE breakout mode.
Note: Before changing the port breakout configuration from one setting to another, the port must
first be set back to the default setting.
On the MX9116n FSE, single-density QSFP28 port groups are 13 and 14 and contain
ports Ethernet 1/1/41 and 1/1/42 and are used to connect to upstream networking
devices. By default, both port groups are set to 1x100GbE. Port groups 13 and 14 support
the following Ethernet breakout modes:
The MX9116n FSE single-density QSFP28 port groups support the following Ethernet
breakout configurations:
• 4x 10GbE – Breakout a QSFP28 port into four 10GbE interfaces
• 1x 40GbE – Set a QSFP28 port to 40GbE mode
• 4x 25GbE – Breakout a QSFP28 port into four 25GbE interfaces
• 2x 50GbE – Breakout a QSFP28 port into two 50GbE interfaces
• 1x 100GbE – Reset the unified port back to the default, 100GbE mode
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