H3C S5120-EI Series, Operation Manual

Page: 41 / 1191

1-3
10-Gigabit Ethernet ports do not support the
duplex
command or the
speed
command.
Configuring an Auto-negotiation Transmission Rate
Usually, the transmission rate on an Ethernet port is determined through negotiation with the peer end,
which can be any rate within the capacity range. With auto-negotiation rate configured, you can enable
the Ethernet port to negotiate only part of the transmission rates within its capacity.
Figure 1-1
An application diagram of auto-negotiation transmission rate
As shown in Figure 1-1, the network card transmission rate of the server group (Server 1, Server 2, and
Server 3) is 1000 Mbps, and the transmission rate of GigabitEthernet 1/0/4, which provides access to
the external network for the server group, is 1000 Mbps too. If you do not specify an auto-negotiation
range on the device, the transmission rate on GigabitEthernet 1/0/1, GigabitEthernet 1/0/2 and
GigabitEthernet 1/0/3 through negotiation with the servers is 1000 Mbps, which may cause congestion
on the egress port GigabitEthernet 1/0/4. To solve the problem, you can specify the auto-negotiation
transmission rate on GigabitEthernet 1/0/1, GigabitEthernet 1/0/2, and GigabitEthernet 1/0/3 to 100
Mbps.
Follow these steps to configure an auto-negotiation transmission rate:
To do… Use the command… Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Configure the auto-negotiation
transmission rate range
speed auto
[
10
|
100
|
1000
] * Optional