No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

Common Operation Guide

CloudEngine 12800, 12800E, 8800, 7800, 6800, and 5800 Series Switches

Rate and give feedback :
Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Enabling Flow Control on an Interface

Enabling Flow Control on an Interface

Flow control prevents packet loss caused by network congestion. If network congestion occurs on a device with flow control configured, the device sends a pause frame to the remote device, requesting the remote device to temporarily stop sending packets. After receiving the pause frame, the remote device temporarily stops sending packets to the local device regardless of the interface working rate.
NOTE:

The pause frame is an Ethernet frame that carries a time parameter that specifies the period during which the device receiving the pause frame stops sending packets. If the congestion persists after the specified period, the local device keeps sending pause frames until the congestion is eliminated.

Figure 15-1  Flow control process

The device supports two configuration modes: flow control and flow control auto-negotiation. If both the local and remote devices support auto-negotiation, you can configure flow control auto-negotiation on the two devices. The local device then negotiates with the remote device to determine whether to enable flow control based on the network congestion status.

Pay attention to the following points:
  • Do not configure flow control and flow control auto-negotiation on the same interface at the same time.
  • Perform the same configuration on the local and remote interfaces. If both the local and remote interfaces support auto-negotiation, you are advised to configure flow control auto-negotiation on the two interfaces.
  • On the CE8860EI, CE8850EI, CE7855EI, CE7850EI, CE6865EI, CE6860EI, CE6855HI, CE6856HI, CE6850U-HI, CE6851HI, or CE6850HI, if you run the assign forward mode cut-through command in the system view to set the packet forwarding mode to cut-through, the switch does not support flow control and flow control auto-negotiation. To configure flow control, you are advised to run the assign forward mode store-and-forward command in the system view to set the packet forwarding mode to store-and-forward.

For example, enable flow control on 10GE1/0/1.

<HUAWEI> system-view
[~HUAWEI] interface 10ge 1/0/1
[~HUAWEI-10GE1/0/1] flow-control  //Enable flow control. By default, flow control is disabled.
[*HUAWEI-10GE1/0/1] commit

For example, enable flow control auto-negotiation on 10GE1/0/1.

<HUAWEI> system-view
[~HUAWEI] interface 10ge 1/0/1
[~HUAWEI-10GE1/0/1] undo negotiation disable  //Enable auto-negotiation. By default, auto-negotiation is enabled.
[*HUAWEI-10GE1/0/1] flow-control negotiation  //Enable flow control auto-negotiation. By default, flow control auto-negotiation is disabled.
[*HUAWEI-10GE1/0/1] commit
Translation
Download
Updated: 2018-10-08

Document ID: EDOC1000102369

Views: 144264

Downloads: 3160

Average rating:
This Document Applies to these Products
Related Documents
Related Version
Share
Previous Next