Configuring Flow Control On An Ethernet Interface - HP 6125G Configuration Manual

Figure 1 Speed auto negotiation application scenario
As shown in
highest speed of 1000 Mbps. If the transmission rate of each server in the server cluster is 1000 Mbps,
their total transmission rate will exceed the capability of port GigabitEthernet 1/0/4, the port providing
access to the Internet for the servers.
To avoid congestion on GigabitEthernet 1/0/4, set 100 Mbps as the only option available for speed
negotiation on port GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3. As a
result, the transmission rate on each port connected to a server is limited to 100 Mbps.
To set speed options for auto negotiation on an Ethernet interface:
Step
1. Enter system view.
2. Enter Ethernet interface view.
3. Set speed options for auto negotiation.
NOTE:
The speed and speed auto commands supersede each other, and whichever is configured last takes effect.

Configuring flow control on an Ethernet interface

To avoid packet drops on a link, you can enable flow control at both ends of the link. When traffic
congestion occurs at the receiving end, the receiving end sends a flow control (Pause) frame to ask the
sending end to suspend sending packets.
Flow control is implemented by receiving and sending Pause frames on ports. Flow control can operate
in one of the following modes on an interface:
• TxRx mode (configured by using the flow-control command)—The interface can both send and
receive flow control frames.
Rx mode (configured by using the flow-control receive enable command)—The interface can
•
receive, but not send flow control frames.
Figure 1, all ports on Switch A are operating in speed auto negotiation mode, with the
Command
system-view
interface interface-type interface-number
speed auto { 10 | 100 | 1000 } *
4
Remarks
N/A
N/A
Optional.