H3C Technologies H3C S12500 Series Switches - Manual (Page 21)

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Figure 1 Speed auto negotiation application scenario
As shown in Figure 1 , 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
47. Enter system view. system-view N/A
48. Enter Ethernet interface view. interface interface-type
interface-number
N/A
49. 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.