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 congured in FEM mode with 8x25GE breakout interfaces enabled. QSFP28-DD port groups
10 to 12 are congured in native mode with 2x100GE breakout interfaces enabled.
For information about how to congure single-density QSFP28 Ethernet port groups 13 and 14, see Single-density QSFP28 interfaces.
For information about how to congure unied port groups 15 and 16 to operate in Ethernet or Fibre Channel mode, see Unied port
groups.
1 To congure 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 conguration, 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
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