Setting The Mdix Mode Of An Ethernet Interface - H3C S7500E Series Instruction Manual

Step
4. (Optional.) Enable storm
control, and set the lower
and upper thresholds for
broadcast, multicast, or
unknown unicast traffic.
5. Set the control action to take
when monitored traffic
exceeds the upper
threshold.
6. (Optional.) Enable the
Ethernet interface to output
log messages when it
detects storm control
threshold events.
7. (Optional.) Enable the
Ethernet interface to send
storm control threshold
event traps.

Setting the MDIX mode of an Ethernet interface

IMPORTANT:
Fiber ports do not support the MDIX mode setting.
A physical Ethernet interface has eight pins, each of which plays a dedicated role. For example, pins
1 and 2 transmit signals, and pins 3 and 6 receive signals. You can use both crossover and
straight-through Ethernet cables to connect copper Ethernet interfaces. To accommodate these
types of cables, a copper Ethernet interface can operate in one of the following Medium Dependent
Interface-Crossover (MDIX) modes:
•
MDIX mode—Pins 1 and 2 are receive pins and pins 3 and 6 are transmit pins.
•
MDI mode—Pins 1 and 2 are transmit pins and pins 3 and 6 are receive pins.
•
AutoMDIX mode—The interface negotiates pin roles with its peer.
NOTE:
This feature does not take effect on pins 4, 5, 7, and 8 of physical Ethernet interfaces. Pins 4, 5, 7,
and 8 of interfaces operating at 1000 Mbps or higher rates receive and transmit signals.
To enable a copper Ethernet interface to communicate with its peer, set the MDIX mode of the
interface by following these guidelines:
•
Typically, set the MDIX mode of the interface to AutoMDIX. Set the MDIX mode of the interface
to MDI or MDIX only when the device cannot determine the cable type.
•
When a straight-through cable is used, configure the interface to operate in an MDIX mode
different than its peer.
•
When a crossover cable is used, perform one of the following tasks:
Configure the interface to operate in the same MDIX mode as its peer.
Configure either end to operate in AutoMDIX mode.
To set the MDIX mode of an Ethernet interface:
Command
storm-constrain { broadcast |
multicast | unicast } { pps | kbps
| ratio } upperlimit lowerlimit
storm-constrain control { block
| shutdown }
storm-constrain enable log
storm-constrain enable trap
19
Remarks
By default, storm control is
disabled.
By default, storm control is
disabled.
By default, the Ethernet interface
outputs log messages when
monitored traffic exceeds the
upper threshold or drops below
the lower threshold.
By default, the Ethernet interface
sends traps when monitored
traffic exceeds the upper
threshold or drops below the
lower threshold from the upper
threshold.