H3C Technologies H3C S3600 Series Switches - Manual (Page 163)

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z 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.
z 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.
z 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.
Limiting Traffic on individual Ports
By performing the following configurations, you can limit the incoming broadcast/multicast/unknown
unicast traffic on individual ports. When a type of incoming traffic exceeds the threshold you set, the
system drops the packets exceeding the traffic limit to reduce the traffic ratio of this type to the
reasonable range, so as to keep normal network service.
Follow these steps to limit traffic on port:
To do... Use the command... Remarks
Enter system view system-view —
Limit broadcast traffic received
on each port broadcast-suppression { ratio
| pps max-pps }
Optional
By default, the switch does not
suppress broadcast traffic.
Enter Ethernet port view
interface interface-type
interface-number
—
Limit broadcast traffic received
on the current port broadcast-suppression { ratio
| pps max-pps }
Optional
By default, the switch does not
suppress broadcast traffic.
Limit multicast traffic received
on the current port multicast-suppression { ratio |
pps max-pps }
Optional
By default, the switch does not
suppress multicast traffic.
Limit unknown unicast traffic
received on the current port unicast-suppression { ratio |
pps max-pps }
Optional
By default, the switch does not
suppress unknown unicast
traffic.
Configuring Flow Control on a Port
In situations where the receiving port is unable to process received frames, you can use the flow control
function to enable the receiving port to inform the sending port to stop sending the frames for a while,
thus preventing frames from being dropped.
The flow control function is implemented on a port by sending and receiving pause frames. Flow control
operates in one of the following two modes on a port:
z TxRx mode, where the port can receive and send pause frames.