# Flow control

### 1. Summary

This page is for configuring flow control (the IEEE 802.3x PAUSE frame transmission and reception).

### 2. Top page

This is the top page for flow control.

#### 2.1. System settings

- Displays the current setting whether to useflow control (the IEEE 802.3x PAUSE frame transmission and reception)for the entire system.

- Press the "Setting" button to display the page for configuring the settings.

- To enable flow control for the entire system, you need to disable the QoS function.

#### 2.2. Interface settings

- Displays flow control settings for each LAN/SFP port.

- Press the "Setting" button to display the page for configuring the selected interface.

- Press the "Return to defaults" button to initialize the settings for all interfaces with the check box selected.

- Press the "Specify all" button to configure the settings for all interfaces with the check box selected.

### 3. System settings page

This page is for configuring flow control (the IEEE 802.3x PAUSE frame transmission and reception) for the entire system.
Once you have entered the settings, press the "Confirm" button.
If the input information on the confirm page is correct, press the "OK" button.

#### 3.1. System settings

- Flow control for entire system
  You can specify whether to enable or disable flow control for the entire system.
  Even if flow control for the entire system isenabled, flow control does not work for a port whose individual portsetting is disabled.

- Constraints
  If flow control is enabled, the tail drop function is disabled. However, this excludes the case wherethe stack function is enabled.

### 4. Interface settings page

This page is for configuring flow control (the IEEE 802.3x PAUSE frame transmission and reception) for the interface.
Once you have entered the settings, press the "Confirm" button.
If the input information on the confirm page is correct, press the "OK" button.

#### 4.1. Interface settings

- Flow control
  Specify whether to enable or disable flow control for LAN/SFP ports.
  If it is enabled, Pause frames are sent andreceived regardless of whether the target device supports flow control.

- Auto negotiation
  Use auto negotiation to verify that the target device supports flow control.
  If the target device does not support flow control, Pause frames are not sent or received.

- Constraints

  - In the following cases, only receiving Pause frames is supported.
    If the stack function is enabled

  - In the following cases, auto negotiation does not work even if it is enabled.
    When an SFP+ module is used

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