Setting The Ethernet Port Broadcast Suppression Ratio; Enabling Flow Control On A Port - 3Com WX3000 Series Operation Manual

To do...
Configure the available
auto-negotiation speed(s) for
the port
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-suppression commands 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-suppression command in system view or Ethernet port view:
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...
Enter system view
Set the global broadcast
suppression ratio
Enter Ethernet port view
Set the broadcast suppression
ratio on current 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:
Use the command...
speed auto [ 10 | 100 | 1000 ]*
Use the command...
system-view
broadcast-suppression
{ ratio | pps max-pps }
interface interface-type
interface-number
broadcast-suppression
{ ratio | pps max-pps }
1-5
Remarks
Optional
By default, the port speed is
auto-negotiated.
Remarks
—
By default, the ratio is 100%, that is,
the system does not suppress
broadcast traffic globally.
—
By default, the ratio is 100%, that is,
the system does not suppress
broadcast traffic on the port.