Configuring Flow Control On An Ethernet Interface - 3Com MSR 50 Series Configuration Manual

90 C 3: E
HAPTER THERNET
n
Configuring Flow
Control on an Ethernet
Interface
I C
NTERFACE ONFIGURATION
Half-duplex mode (half): in this mode, at a particular time, either the sending
■
or receiving of data packets is allowed, but not both;
Auto-negotiation mode (auto): in this mode, the transmission mode is
■
negotiated between peer Ethernet interfaces.
If you configure the transmission rate for an Ethernet interface to be auto, then
the rate will be automatically negotiated between peer Ethernet interfaces.
Follow these steps to make basic Ethernet interface configurations:
To do...
Enter system view
Enter Ethernet interface view
Configure the description for
an Ethernet interface
Configure the duplex mode
for an Ethernet interface
Configure the transmission
rate for an Ethernet interface
Shut down the Ethernet
interface
The optical port does not support the speed command.
■
The speed 1000 command is only applicable in GigabitEthernet interface view.
■
When flow control is turned on between peer Ethernet interfaces, 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 configure flow control on an Ethernet interface:
To do...
Enter system view
Enter Ethernet interface view
Turn on flow control on an
Ethernet interface
Use the command...
system-view
interface interface-type
interface-number
description text
duplex { auto | full | half }
speed { 10 | 100 | 1000 |
auto }
shutdown
Use the command...
system-view
interface interface-type
interface-number
flow-control
Remarks
-
-
Optional
By default, the descriptive
string is the current interface
name followed by
"interface".
Optional
auto by default.
Optional
auto by default.
Optional
By default, an Ethernet
interface is up. Use the undo
shutdown command to
bring up an Ethernet
interface.
Remarks
-
-
Required
Turned off by default