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Dell EMC SmartFabric OS10 User Guide Release 10.5.1

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Double-density QSFP28 interfaces

On the MX9116n Fabric Switching Engine module, configure a double-density QSFP28 (QSFP28-DD) port in PORT-GROUP mode. A QSFP28-DD port group consists of two Ethernet 100G ports. The ports do not function as a single 200GE port. Use a QSFP28-DD port to:
  • 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
MX9116n Fabric Engine QSFP28DD 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.

NOTE: By default, the port group 10 is not in the fabric expander mode; so, to use port group 10 as FEM, breakout the port group in FabricExpander mode.
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 configured in FEM mode with 8x25GE breakout interfaces enabled. QSFP28-DD port groups 10 to 12 are configured in native mode with 2x100GE breakout interfaces enabled.
  • For information about how to configure single-density QSFP28 Ethernet port groups 13 and 14, see Single-density QSFP28 interfaces.
  • For information about how to configure unified port groups 15 and 16 to operate in Ethernet or Fibre Channel mode, see Unified port groups.
  • If an MX9116n module is in SmartFabric mode, use the OpenManage Enterprise - Modular interface to configure breakout interfaces and speed on a QSFP28-DD port.
  1. To configure 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 configuration, enter the show port-group command.
    OS10# 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.
    • 10g-8x — Split a QSFP28-DD port into eight 10GE interfaces.
  4. Return to CONFIGURATION mode.
    exit
  5. Enter Ethernet Interface mode to configure other settings. Enter a single interface, a hyphen-separated range, or multiple interfaces separated by commas.
    interface ethernet node/slot/port[:subport]

    To display the Ethernet 100GE port configuration in a QSFP28-DD port group, enter the show port-group command. To display the Ethernet 25GE subport configuration, enter the show interfaces status command.

Configure QSFP28-DD interface

OS10(config)# port-group 1/1/7
OS10(conf-pg-1/1/7)# mode Eth 25g-8x
OS10(conf-pg-1/1/7)# exit
OS10(config)# interface ethernet 1/1/29:4
OS10(conf-if-eth-1/1/29:4)# 

View QSFP28-DD interface

OS10(config)# interface ethernet 1/1/29:4
OS10(conf-if-eth1/1/29:4)# show configuration
!
interface ethernet1/1/29:4
 no shutdown

View QSFP28-DD port groups and default modes

OS10# 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     -  
...

View QSFP28-DD default 8x25G breakout interfaces

OS10# show interface status 
---------------------------------------------------------------------------
Port        Description   Status   Speed    Duplex   Mode Vlan Tagged-Vlans
---------------------------------------------------------------------------
...
Eth 1/1/17:1              down     0        auto     A    1    - 
Eth 1/1/17:2              down     0        auto     A    1    - 
Eth 1/1/17:3              down     0        auto     A    1    - 
Eth 1/1/17:4              down     0        auto     A    1    - 
Eth 1/1/18:1              down     0        auto     A    1    - 
Eth 1/1/18:2              down     0        auto     A    1    - 
Eth 1/1/18:3              down     0        auto     A    1    - 
Eth 1/1/18:4              down     0        auto     A    1    - 
Eth 1/1/19:1              down     0        auto     A    1    - 
Eth 1/1/19:2              down     0        auto     A    1    - 
Eth 1/1/19:3              down     0        auto     A    1    - 
Eth 1/1/19:4              down     0        auto     A    1    - 
Eth 1/1/20:1              down     0        auto     A    1    - 
Eth 1/1/20:2              down     0        auto     A    1    - 
Eth 1/1/20:3              down     0        auto     A    1    - 
Eth 1/1/20:4              down     0        auto     A    1    - 
Eth 1/1/21:1              down     0        auto     A    1    - 
Eth 1/1/21:2              down     0        auto     A    1    - 
Eth 1/1/21:3              down     0        auto     A    1    - 
Eth 1/1/21:4              down     0        auto     A    1    - 
Eth 1/1/22:1              down     0        auto     A    1    - 
Eth 1/1/22:2              down     0        auto     A    1    - 
Eth 1/1/22:3              down     0        auto     A    1    - 
Eth 1/1/22:4              down     0        auto     A    1    - 
...

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