Users Guide
• Connect to a Fabric Expander to extend the fabric.
• Connect to an Ethernet rack server or storage device.
• Connect to another switch or router.
Figure 1. MX9116n Fabric Switching Engine — QSFP28-DD port groups
QSFP28-DD port groups are 1 to 12 and contain physical ports 1/1/17 to 1/1/40. Server-facing ports are 1/1/1 to 1/1/16.
QSFP28-DD Ethernet interfaces support Fabric Expander mode (FEM) and native Ethernet mode.
• In FEM mode, an 8x25GE interface connects only to an attached Fabric Expander using supported cables.
• In native Ethernet mode, an interface connects to an upstream switch, rack server, or other Ethernet device.
By default, QSFP28-DD port groups 1 to 9 are congured in FEM mode with 8x25GE breakout interfaces enabled. QSFP28-DD port groups
10 to 12 are congured in native mode with 2x100GE breakout interfaces enabled.
• For information about how to congure single-density QSFP28 Ethernet port groups 13 and 14, see Single-density QSFP28 interfaces.
• For information about how to congure unied port groups 15 and 16 to operate in Ethernet or Fibre Channel mode, see Unied port
groups.
1 To congure a QSFP28-DD port interface, enter PORT-GROUP mode from CONFIGURATION mode. Enter 1/1 for node/slot. The
QSFP28-DD port-group range is 1 to 12.
port-group node/slot/port-group
2 (Optional) To verify the current QSFP28-DD port-group conguration, enter the show port-group command.
OS10(config)# do show port-group
Port-group Mode Ports FEM
port-group1/1/1 Eth 25g-8x 17 18 FEM
port-group1/1/2 Eth 25g-8x 19 20 FEM
port-group1/1/3 Eth 25g-8x 21 22 FEM
port-group1/1/4 Eth 25g-8x 23 24 FEM
port-group1/1/5 Eth 25g-8x 25 26 FEM
port-group1/1/6 Eth 25g-8x 27 28 FEM
port-group1/1/7 Eth 25g-8x 29 30 FEM
port-group1/1/8 Eth 25g-8x 31 32 FEM
port-group1/1/9 Eth 25g-8x 33 34 FEM
port-group1/1/10 Eth 100g-2x 35 36 -
port-group1/1/11 Eth 100g-2x 37 38 -
port-group1/1/12 Eth 100g-2x 39 40 -
...
To reset a QSFP28-DD port group to its default setting, enter the no mode command in PORT-GROUP mode. This command sets
QSFP-DD port groups 1 to 9 to 8x25GE FEM mode and QSFP-DD port groups 10 to 12 to 2x100GE mode.
no mode
3 To activate a QSFP28-DD interface for Ethernet operation, enter the mode Eth command in PORT-GROUP mode.
mode Eth {100g-2x | 50g-4x | 40g-2x | 25g-8x fabric-expander-mode | 25g-8x | 10g-8x}
• 100g-2x — Split a QSFP28-DD port into two 100GE interfaces.
• 50g-4x — Split a QSFP28-DD port into four 50GE interfaces.
• 40g-2x — Split a QSFP28-DD port into two 40GE interfaces.
• 25g-8x fabric-expander-mode — Split a QSFP28-DD port into eight 25GE interfaces for connection only to an MX7116n
Fabric Expander.
• 25g-8x — Split a QSFP28-DD port into eight 25GE interfaces.
PowerEdge MX Ethernet I/O modules
77