13
Figure 1
Speed auto negotiation application scenario
As shown in
, the network adapters of Server 1 and Server 2 both operate at 1000 Mbps, and
the uplink port of the switch, GigabitEthernet 3/0/3, also operates at 1000 Mbps. If no speed options
are set on the switch, the result of speed negotiation between GigabitEthernet 3/0/1 and
GigabitEthernet 3/0/2 and the servers will be 1000 Mbps. As a result, congestion might occur on
GigabitEthernet 3/0/3.
To avoid congestion on GigabitEthernet 3/0/3, configure 100 Mbps as the only option available for
speed negotiation on GigabitEthernet 3/0/1 and GigabitEthernet 3/0/2. In this way, the transmission
rate on both GigabitEthernet 3/0/1 and GigabitEthernet 3/0/2 is limited to 100 Mbps.
To set speed options for auto negotiation on an Ethernet interface:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Ethernet interface view.
interface
interface-type
interface-number
N/A
3.
Set speed options for auto
negotiation.
speed
auto
{
10
|
100
|
1000
} *
Optional.
By default, no speed options for
auto negotiation are set.
NOTE:
•
This function is available only for 100-Mbps and 1000-Mbps Layer 2 Ethernet interfaces that support
speed auto negotiation. For a combo interface, only the copper port supports this function.
•
The
speed
and
speed auto
commands supersede each other, and whichever is configured last takes
effect.