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Comment: added caveat about the Dell S4148T switch and QSFP+ port settings

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Note
titlePlatform Limitations
  • On Lenovo NE2572O switches, swp1 thru swp8 only support 25G speed.
  • For 10G and 1G SFPs inserted in a 25G port on a Broadcom platform, you must edit the /etc/cumulus/ports.conf file and configure the four ports in the same core to be 10G. See Caveats and Errata below.

  • On Edgecore AS7326-56X switches, all four switch ports in each port group must be set to the same link speed; otherwise, the links won't come up. These ports are set to 25G by default, but can also be set to 10G. The port groups on this switch are as follows, where each row is a port group:

    • 1 2 3 6*
    • 4 5 7* 9
    • 8 10 11* 12
    • 13 14 15 18*
    • 16 17 19* 21
    • 20 22 23* 24
    • 25 26 27 30*
    • 28 29 31* 33
    • 32 34 35* 36
    • 37 38 39 42*
    • 40* 41 43 45
    • 44* 46 47 48

    If, for example, you configure port 19 for 10G, then you must also configure ports 16, 17 and 21 for 10G.

    Additionally, you can gang each port group together as a 100G or 40G port. When ganged together, one port — based on the arrangement of the ports — is designated as the gang leader. This port's number is used to configure the ganged ports and is marked with an asterisk ( * ) above.

Anchor
mtu
mtu
MTU

Interface 

Scroll Indexterm
primaryMTU
MTU (maximum transmission unit) applies to traffic traversing the management port, front panel/switch ports, bridge, VLAN subinterfaces and bonds — in other words, both physical and logical interfaces.

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On the Dell S5248F switch, the 2x200G QSFP-DD interfaces labeled 49/50 and 51/52 are not supported natively at 200G speeds. The interfaces are supported with 100G cables; however, you can only use one 100G cable from each QSFP-DD port. The upper QSFP-DD port is named swp49 and the lower QSFP-DD port is named swp52.

QSFP+ Ports on the Dell S4148T Switch

On the Dell S4148T switch, the two QSFP+ ports are set to disabled by default and the four QSFP28 ports are configured for 100G. The following example shows the default settings in the /etc/cumulus/ports.conf file for this switch:

Code Block
languagetext
cumulus@switch:~$ sudo cat /etc/cumulus/ports.conf
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# QSFP+ ports
#
# <port label 27-28> = [4x10G|40G]
27=disabled
28=disabled
# QSFP28 ports
#
# <port label 25-26, 29-30> = [4x10G|4x25G|2x50G|40G|50G|100G]
25=100G
26=100G
29=100G
30=100G

To enable the two QSFP+ ports, you must configure all four QSFP28 ports for either 40G or 4x10G. You cannot use either of the QSFP+ ports if any of the QSFP28 ports are configured for 100G.

The following example shows the /etc/cumulus/ports.conf file with all four QSFP28 ports configured for 40G and both QSFP+ ports enabled:

Code Block
languagetext
cumulus@switch:~$ sudo cat /etc/cumulus/ports.conf
...
# QSFP+ ports
#
# <port label 27-28> = [4x10G|40G]
27=40G
28=40G
# QSFP28 ports
#
# <port label 25-26, 29-30> = [4x10G|4x25G|2x50G|40G|50G|100G]
25=40G
26=40G
29=40G
30=40G
Note

To disable the QSFP+ ports, you must set the ports to disabled. Do not comment out the lines as this prevents switchd from restarting.

Link Speed on the EdgeCore AS7326-56X Switch

On the EdgeCore AS7326-56X switch, all four switch ports in each port group must be set to the same link speed; otherwise, the links do not come up. These ports are set to 25G by default, but can also be set to 10G. The port groups on this switch are as follows, where each row is a port group:

  • 1 2 3 6*
  • 4 5 7* 9
  • 8 10 11* 12
  • 13 14 15 18*
  • 16 17 19* 21
  • 20 22 23* 24
  • 25 26 27 30*
  • 28 29 31* 33
  • 32 34 35* 36
  • 37 38 39 42*
  • 40* 41 43 45
  • 44* 46 47 48

For example, if you configure port 19 for 10G, you must also configure ports 16, 17 and 21 for 10G.

Additionally, you can gang each port group together as a 100G or 40G port. When ganged together, one port (based on the arrangement of the ports) is designated as the gang leader. This port's number is used to configure the ganged ports and is marked with an asterisk ( * ) above.

ethtool Shows Incorrect Port Speed on 100G Mellanox Switches

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