H3c-technologies H3C SecPath F1000-E Manual de usuario descargar pdf (Pagina 10)

Setting the MTU for an Ethernet Interface/Subinterface

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

Follow these steps to set the MTU for an Ethernet interface/subinterface:

To do… Use the command… Remarks

Enter system view

system-view

—

Enter Ethernet interface

view/Ethernet subinterface view

interface interface-type

{ interface-number |

interface-number.subnumber }

—

Set the MTU

mtu size

Optional

1500 bytes by default

NOTE:

Due to the QoS queue length limit (for example, the default length of an FIFO queue is 75), too small an

MTU will result in too many fra

ments, which will be discarded from the QoS queue. In this case, you can

increase MTU or QoS queue length properly. In Ethernet interface view, you can use the qos fifo

queue-length command to change the QoS queue length.

Configuring an Ethernet Interface to Operate in Promiscuous

Mode

Typically, an Ethernet interface receives only packets with matched destination MAC addresses. After

you configure an Ethernet interface to operate in promiscuous mode, however, the interface no longer

checks the MAC addresses in received packets. Rather, it receives all Ethernet packets with correct format.

Generally, you may need to configure a network listening port to operate in promiscuous mode.

Follow these steps to configure an Ethernet interface to operate in promiscuous mode:

To do… Use the command… Remarks

Enter system view

system-view

—

Enter Ethernet interface view

interface interface-type

interface-number

—

Configure the Ethernet interface to

operate in promiscuous mode

promiscuous

Required

By default, an Ethernet interface does

not operate in promiscuous mode.

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