Setting The Mdi Mode Of An Ethernet Interface - HP 6125G Configuration Manual

Step
3. Set the loopback
detection interval.
4. Enter Ethernet
interface view.
5. Enable loopback
detection on the
interface.
6. Enable loopback
detection control on a
trunk port or a hybrid
port.
7. Enable loopback
detection in all the
VLANs on the trunk or
hybrid port.
8. Set the protective
action to take on the
interface when a loop
is detected.

Setting the MDI mode of an Ethernet interface

IMPORTANT:
Fiber ports and internal Ethernet interfaces do not support the MDI mode setting.
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 (MDI) modes:
Across mode
•
Normal mode
•
Auto mode
•
A copper Ethernet interface uses an RJ-45 connector, which comprises eight pins, each playing a
dedicated role. For example, pins 1 and 2 transmit signals, and pins 3 and 6 receive signals. The pin
role varies by the MDI modes as follows:
In normal mode, pins 1 and 2 are transmit pins, and pins 3 and 6 are receive pins.
•
• In across mode, pins 1 and 2 are receive pins, and pins 3 and 6 are transmit pins.
In auto mode, the interface negotiates pin roles with its peer.
•
Command
loopback-detection interval-time
time
interface interface-type
interface-number
loopback-detection enable
loopback-detection control
enable
loopback-detection per-vlan
enable
loopback-detection action
{ no-learning | semi-block |
shutdown }
10
Remarks
Optional.
30 seconds by default.
Use either command.
Disabled by default.
Optional.
Disabled by default.
Optional.
By default, a trunk or hybrid port performs
loopback detection only in its port VLAN ID
(PVID).
Optional.
By default, a looped interface does not
receive or send packets; the system
generates traps and log messages, and
deletes all MAC address entries of the
looped interface.
With the shutdown keyword specified, the
switch shuts down the looped ports and set
their physical state to Loop down. When a
looped port recovers, you must use the undo
shutdown command to restore its forwarding
capability.