Enabling Bridging On An Ethernet Interface - HP 5120 EI Series Lan Switching Configuration Manual

IMPORTANT:
Fiber ports 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.
•
To enable the interface to communicate with its peer, make sure that its transmit pins are connected to the
remote receive pins. If the interface can detect the connection cable type, set the interface in auto MDI
mode. If not, set its MDI mode by using the following guidelines:
When a straight-through cable is used, set the interface to operate in the MDI mode different than
•
its peer.
When a crossover cable is used, set the interface to operate in the same MDI mode as its peer, or
•
set either end to operate in auto mode.
To set the MDI mode of an Ethernet interface:
Step
1. Enter system view.
2. Enter Ethernet interface view.
3. Set the MDI mode of the
Ethernet interface.

Enabling bridging on an Ethernet interface

When an incoming packet arrives, the device looks up the destination MAC address of the packet in the
MAC address table. If an entry is found, but the outgoing interface is the same as the receiving interface,
the device discards the packet.
To enable the device to forward such packets rather than drop them, enable the bridging function on the
Ethernet interface.
To enable bridging on an Ethernet interface:
Command
system-view
interface interface-type
interface-number
mdi { across | auto | normal }
13
Remarks
N/A
N/A
Optional.
By default, a copper Ethernet
interface operates in auto mode to
negotiate pin roles with its peer.