HP VPN Firewall Appliances Network Management Configuration Guide

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Ste

Command

Remarks

5. Set the unknown unicast

suppression threshold ratio.

unicast-suppression ratio

Optional.

By default, unknown unicast traffic is

allowed to pass through an interface.

Setting the MDI mode of an Ethernet interface

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 of which plays 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 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:

Ste

Command

Remarks

1. Enter system view.

system-view N/A

2. Enter Ethernet interface view.

interface interface-type

interface-number

N/A

3. Set the MDI mode of the

Ethernet interface.

mdi { across | auto | normal }

By default, a copper Ethernet

interface operates in auto mode to

negotiate pin roles with its peer.

Configuring a Layer 3 Ethernet interface or subinterface

Setting the MTU for an Ethernet interface or subinterface

The value of Maximum Transmission Unit (MTU) affects the fragmentation and re-assembly of IP packets.