Configure Port Properties

You can change several port properties, including description, port speed, MTU, Forward Error Correction, port breakout, header stripping, and Link Fault Signaling.

About this task

Note

(SLX only) If the port you are configuring is part of a port channel, do not change the MTU or the Port Speed values from the Visibility Manager interface.

1. In the Navigation menu, select Configure.
2. In the Devices panel, select the device for which you want to configure a port.
3. Select the Configurations tab.
4. In the Device Config menu, expand Ports.
5. Select a port to display a list of properties.
6. In the Description field, provide new information.
7. In the Port Speed field, select a different speed.
8. In the MTU field, select the maximum transmission unit for packets that pass through the port.
9. (MLX and SLX only) In the Headers field, select one or more types of header to strip.
10. (SLX and 9920 only) In the Breakout field, select one of the following:
    • 4x10G: Configures four 10G breakout interfaces on the port.
    • 4x25G: Configures four 25G breakout interfaces on the port.
    • None
11. In the Forward Error Correction field, select one of the following:
    • Auto-negotiation: Selects the appropriate algorithm automatically.
    • FC-FEC: An algorithm that corrects errors in a block of data, with lower latency than RS-FEC.
    • RS-FEC: An algorithm that corrects errors in a block of data, with better error correction than FC-FEC.
    • Disabled: Disables the FEC feature.
    FEC corrects errors in data without the need for retransmission of the data. Port speed determines which FEC configuration is supported.

    • For 100G ports, RS-FEC, Auto-negotiation, and Disabled are supported.
    • For 25G ports, RS-FEC, FC-FEC, Auto-negotiation, and Disabled are supported.
    • For 40G and 10G ports, only Disabled is supported.
12. (9920 only) To enable communication between two Ethernet devices, select Link Fault Signaling.
    Link Fault Signaling is a physical layer protocol that enables a port to report fault conditions on inbound and outbound ports.
13. Select Enable to change the port operating status to Up.
    When you select this field, you initiate the no shutdown command on the device, which changes the operating status to Up. When the field is not selected, the shutdown command runs on the port and the operating status changes to Down.
14. (MLX and SLX only) Select Loopback to configure the port as a loopback interface.
    A loopback is a virtual interface that a device uses to communicate with itself. A loopback interface cannot be used as an egress interface.
15. (SLX only) Select Truncation Profile to slice an incoming packet on the loopback interface based on the specified frame size.
    1. In the Profile Name field, enter a name for the truncation profile.
    2. In the Frame Size field, enter a value to represent the maximum packet size after truncation.
       The final packet size will be less than or equal to this value.
16. Save (✔) your selections.