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Introduction of Interface Rate

Introduction of Interface Rate

The interface rate can be configured in two modes: force rate (non-auto-negotiation mode) and auto-negotiation mode.

NOTEs:

  • Interfaces at both ends of a link SHOULD work in the same auto-negotiation mode. Otherwise, the interfaces may not be able to communicate with each other.

  • The 2.5G/5G RJ45 interfaces don’t support setting the force speed by using the command set interface gigabit-ethernet<interface-name> speed <speed>. Users can configure auto-negotiation mode to auto-negotiate the interface rate for these interfaces, together with the optional command set interface gigabit-ethernet <interface-name> auto-speeds <auto-speed>to manually specify the auto-negotiation rate range.

Force Rate (Non-auto-negotiation Mode)

If you want to use a specific interface rate for communication rather than auto-negotiate the interface rate, you can configure the force rate of the interface.

You can configure the force rate of an interface by using the command set interface gigabit-ethernet<interface-name> speed <speed>.

NOTE:

When the interface is configured in the force rate (non-auto-negotiation mode), interfaces at both ends of a link should work at the same rate. Otherwise, the interfaces may not be able to communicate with each other.

Instructions for the Switch Interface Rate Configuration

  • 1G RJ45 interface: The interface rate can be configured to 100M, 10M, or auto. By default, the interfaces work in auto-negotiation mode.

  • 1G optical interface: The interface rate can be configured to 1000M or auto. By default, the interfaces work in auto-negotiation mode.

  • 10G RJ45 interface: The interface rate can be configured to 100M or auto. By default, the interfaces work in auto-negotiation mode.

  • 10G optical interface:

    • When a 10G optical module is inserted, the interface rate can be configured to 10G or 1G. When no force rate is configured, the interface recognizes the interface rate of itself as 10G.

    • When a 1G optical module is inserted, the interface rate can be configured to 1G. When no force rate is configured, the interface recognizes the interface rate of itself as 1G.

  • 40G optical interface: The interface rate can be configured to 40G. When no force rate is configured, the interface recognizes the interface rate of itself as 40G. If the interface is split, the split interface rate can be configured to 10G or 1G.

  • 100G optical interface: The interface rate can be configured to 100G or 40G.

    • When a 100G optical module is inserted, the interface rate can be configured to 100G or 40G. When no force rate is configured, the interface recognizes the interface rate of itself as 100G. If the interface is split, the split interface rate can be configured to 25G or 10G.

    • When a 40G optical module is inserted, the interface rate can be configured to 40G. When no force rate is configured, the interface recognizes the interface rate of itself as 40G. If the interface is split, the split interface rate can be configured to 10G.

  • 200G optical interface: The interface rate can be configured to 200G or 100G.

    • When a 200G optical module is inserted, the interface rate can be configured to 200G,100G, or 50G. When no force rate is configured, the interface recognizes the interface rate of itself as 200G. If the interface is split, the split interface rate can be configured to 100G or 50G.

    • When a 100G optical module is inserted, the interface rate can be configured to 100G, 50G, or 25G. When no force rate is configured, the interface recognizes the interface rate of itself as 100G. If the interface is split, the split interface rate can be configured to 50G or 25G.

  • 400G optical interface: The interface rate can be configured to 400G, 200G, or 100G. 

    • When a 400G optical module is inserted, the interface rate can be configured to 400G, 200G, or 100G. When no force rate is configured, the interface recognizes the interface rate of itself as 200G. If the interface is split, the split interface rate can be configured to 200G or 100G.

    • When a 200G optical module is inserted, the interface rate can be configured to 200G,100G, or 50G. When no force rate is configured, the interface recognizes the interface rate of itself as 200G. If the interface is split, the split interface rate can be configured to 100G or 50G.

    • When a 100G optical module is inserted, the interface rate can be configured to 100G, 50G, or 25G. When no force rate is configured, the interface recognizes the interface rate of itself as 100G. If the interface is split, the split interface rate can be configured to 50G or 25G.

  • 800G optical interface: The interface rate can be configured to 800G, 400G, 200G, 100G, or auto. By default, the rate of the interface is the maximum rate of the inserted optical module.

    • When an 800G optical module is inserted, the interface rate can be configured to 800G, 400G, 200G, 100G, or auto. When no force rate is configured, the interface recognizes the interface rate of itself as 800G.

    • If the interface is split, the split interface rate can be configured to 400G, 200G, 100G, or auto.

NOTEs:

  • Currently, only the switch platform of N9600-64OD supports 800G optical interfaces.

  • The 800G optical interface can only be inserted into an 800G OSFP optical module.

Auto-negotiation Mode

When the interfaces of the switch in the network support multiple transmission rates, the user can configure auto-negotiation mode to auto-negotiate the interface rate. The devices at both ends of the link exchange interactive messages with the device capability, thus automatically negotiating the optimal interface rate of the interfaces at both ends of the link.

Use the command set interface gigabit-ethernet<interface-name> speed auto to enable the auto-negotiation mode of the interface. The auto-negotiation rates configured on the interfaces must have an intersection at both ends of the link.

Currently, only the following interfaces support the auto-negotiation mode:

  • N9600-64OD: 800G optical interface

  • N9550-64D: 400G optical interface

  • N8550-24CD8D: 200G optical interface and 400G optical interface

  • 10G RJ45, 5G/2.5G RJ45, and 1G RJ45 interfaces

For the 10G RJ45, 5G/2.5G RJ45, and 1G RJ45 interfaces, they work in the auto-negotiation mode by default. For the 800G optical, 400G optical, and 200G optical interfaces, they work in the auto-negotiation mode only when the port is inserted into the Direct Attach Cable (DAC) module by default, and the rate of the interface is the maximum rate of the inserted optical module.

In the auto-negotiation mode, the interfaces negotiate any rate supported by the two devices. If the negotiated interface rate is not the required value, you can use the command set interface gigabit-ethernet <interface-name> auto-speeds to manually specify the auto-negotiation rate to make the interface negotiate the rate within the specified range.

To enable the non-auto-negotiation mode, you can configure the force rate of the interface by using the command set interface gigabit-ethernet<interface-name> speed <speed>.

Use the command set interface gigabit-ethernet <interface-name> auto-speeds multiple times to set multiple negotiation rates. 

Configuration Example

  • The following commands configure multiple auto-negotiation rates on interface xe-1/1/1 to specify the range of auto-negotiation rates to 1000M, 100M, and 10M.

admin@PICOS# set interface gigabit-ethernet xe-1/1/1 auto-speeds 1000 admin@PICOS# set interface gigabit-ethernet xe-1/1/1 auto-speeds 100 admin@PICOS# set interface gigabit-ethernet xe-1/1/1 auto-speeds 10 admin@PICOS# set interface gigabit-ethernet xe-1/1/1 speed auto admin@PICOS# commit

  • The following commands configure one auto-negotiation rate on interface xe-1/1/1 to specify the range of auto-negotiation rate to 1000M.

admin@PICOS# set interface gigabit-ethernet xe-1/1/1 auto-speeds 1000 admin@PICOS# set interface gigabit-ethernet xe-1/1/1 speed auto admin@PICOS# commit

NOTEs:

  • Currently, only the optical interface of the N9600-64OD, N9550-64D, and N8550-24CD8D, 10G RJ45 interface, 5G/2.5G RJ45 interface, and 1G RJ45 interface support the auto-negotiation mode and the configuration of the auto-negotiation rate.

  • Run the command set interface gigabit-ethernet<interface-name>speed auto to configure the Ethernet interface to work in auto-negotiation mode before using the command set interface gigabit-ethernet<interface-name>auto-speeds to manually specify the auto-negotiation rate.

  • In auto-negotiation mode, the device automatically negotiates the duplex mode of the interface while negotiating the interface rate.

 

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