H3C Technologies H3C WX3000E Series Wireless Switches - Manual (Page 136)

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Item Description
MDI
Set the Medium Dependent Interface (MDI) mode for the interface.
Two types of Ethernet cables can be used to connect Ethernet devices: crossover
and straight-through. To accommodate these two types of cables, an Ethernet
interface on the device can operate in one of the following MDI modes:
• Across mode.
• Normal mode.
• Auto mode.
An Ethernet interface is composed of eight pins. By default, each pin has its
particular role. For example, pin 1 and pin 2 are used for transmitting signals; pin
3 and pin 6 are used for receiving signals. Pin roles are set as a result of how you
set the MDI mode:
• In across mode, pin 1 and pin 2 are used for transmitting signals, and pin 3 and
pin 6 are used for receiving signals.
• In auto mode, the pin roles are determined through auto negotiation.
• In normal mode, pin 1 and pin 2 are used for receiving signals while pin 3 and
pin 6 are used for transmitting signals.
Configure the MDI mode depending on the cable types:
• Typically, the auto mode is recommended. The other two modes are useful only
when the device cannot determine the cable types.
• When straight-through cables are used, the local MDI mode must be different
from the remote MDI mode.
• When crossover cables are used, the local MDI mode must be the same as the
remote MDI mode, or the MDI mode of at least one end must be set to auto.
Flow Control
Enable or disable flow control on the interface.
If there is traffic congestion on the device on the local end after flow control is
enabled on both ends, the device sends information to notify the peer end to stop
sending packets temporarily. To avoid packet loss, the peer end and the device stop
sending packets when the device receives the information.
IMPORTANT:
Flow control can be realized only when it is enabled on both ends.
Jumbo Frame
Forwarding
Enable or disable the forwarding of jumbo frames.
Max MAC Count
Set the maximum number of MAC addresses the interface can learn. Available
options include:
• User Defined—Select this option to set the limit manually.
• No Limited—Select this option to set no limit.
Broadcast Suppression
Set broadcast suppression. You can suppress broadcast traffic by percentage or by
PPS:
• ratio—Sets the maximum percentage of broadcast traffic to the total transmission
capability of an Ethernet interface. When this option is selected, you need to
enter a percentage in the box below this option.
• pps—Sets the maximum number of broadcast packets that can be forwarded on
an Ethernet interface every second. When this option is selected, you need to
enter a number in the box below this option.