3Com WX3000 Setting the Ethernet Port Broadcast Suppression Ratio, Speed auto 10 100

To do…	Use the command…	Remarks
Configure the available		Optional
auto-negotiation speed(s) for	speed auto [ 10 100 1000 ]*	By default, the port speed is
the port		auto-negotiated.

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Only ports on the front panel of the device support the auto-negotiation speed configuration feature. And ports on the extended interface card do not support this feature currently.

After you configure auto-negotiation speed(s) for a port, if you execute the undo speed command or the speed auto command, the auto-negotiation speed setting of the port restores to the default setting.

The effect of executing speed auto 10 100 1000 equals to that of executing speed auto, that is, the port is configured to support all the auto-negotiation speeds: 10 Mbps, 100 Mbps, and 1000 Mbps.

Setting the Ethernet Port Broadcast Suppression Ratio

You can use the broadcast-suppressioncommands to restrict the broadcast traffic allowed to pass through a port. After that, if the broadcast traffic on the port exceeds the value you set, the system will maintain an appropriate broadcast traffic ratio by discarding the overflow traffic, so as to suppress broadcast storm, avoid network congestion and ensure normal network services.

You can execute the broadcast-suppressioncommand in system view or Ethernet port view:

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If you execute the command in system view, the command takes effect on all ports.

If you execute the command in Ethernet port view, the command takes effect only on current port.

Follow these steps to set the Ethernet port broadcast suppression ratio:

To do…	Use the command…	Remarks
Enter system view	system-view	—
Set the global broadcast	broadcast-suppression	By default, the ratio is 100%, that is,
		the system does not suppress
suppression ratio	{ ratio pps max-pps }
		broadcast traffic globally.
Enter Ethernet port view	interface interface-type	—
	interface-number
Set the broadcast suppression	broadcast-suppression	By default, the ratio is 100%, that is,
		the system does not suppress
ratio on current port	{ ratio pps max-pps }
		broadcast traffic on the port.

Enabling Flow Control on a Port

After flow control is enabled on both the local and the peer devices, if congestion occurs on the local device, the device will inform its peer to suspend packet sending or lower the packet sending rate. In this way, packet loss is reduced and normal network services are guaranteed.

Follow these steps to enable flow control on a port:

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