3Com Switch 8800 Advanced Software V5 Configuration Guide

56 CHAPTER 6: ETHERNET INTERFACE CONFIGURATION
Similarly, if you configure the transmission rate for an Ethernet interface by using
the speed command with the auto keyword specified, the transmission rate is
determined through auto-negotiation too.
Follow these steps to perform basic Ethernet interface configurations:
n
■ The speed 1000 command is only applicable to GigabitEthernet interfaces.
■ GigabitEthernet electric interfaces cannot operate in half-duplex mode when
the transmission rate is set to 1,000 Mbps.
■ Ethernet optical interfaces cannot operate in half-duplex mode.
■ When optoelectric transducers are used, make sure the interfaces operate in
auto-negotiation mode. Otherwise, the interfaces may operate improperly.
Configuring Flow
Control on an Ethernet
Interface
When flow control is enabled on both sides, if traffic congestion occurs at the
ingress interface, it will send a Pause frame notifying the egress interface to
temporarily suspend the sending of packets. The egress interface is expected to
stop sending any new packets when it receives the Pause frame. In this way, flow
controls helps to avoid the dropping of packets. Note that only after both the
ingress and the egress interfaces have turned on their flow control will this be
possible.
Follow these steps to enable flow control on an Ethernet interface:
To do... Use the command... Remarks
Enter system view system-view -
Enter Ethernet interface view interface interface-type
interface-number
-
Set the description string for
the Ethernet interface
description text Optional
By default, the description
string is "interface index +
Interface".
Set the duplex mode duplex { auto | full | half } Optional
auto by default.
Set the transmission rate speed { 10 | 100 | 1000 | auto
}
Optional
auto by default.
Shut down the Ethernet
interface
shutdown Optional
By default, an Ethernet
interface is in up state.
To do... Use the command... Remarks
Enter system view system-view -
Enter Ethernet interface view interface interface-type
interface-number
-
Enable flow control flow-control Required
Turned off by default