H3C Technologies H3C SR8800 - Manual (Page 16)

9
Setting speed options for auto negotiation on an Ethernet
interface
Speed auto negotiation enables an Ethernet interface to negotiate with its peer for the highest speed
supported by both ends by default. You can narrow down the speed option list for negotiation.
Figure 1 Speed auto negotiation application scenario
As shown in Figure 1 , all ports on Router A are operating in speed auto negotiation mode, with the
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 3/1/4, the port providing
access to the Internet for the servers.
To avoid congestion on GigabitEthernet 3/1/4, set 100 Mbps as the only option available for speed
negotiation on port GigabitEthernet 3/1/1, GigabitEthernet 3/1/2, and GigabitEthernet 3/1/3. 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 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, the options for auto
negotiation are not restricted.
NOTE:
•
Support for this feature varies with interface cards or subcards.
• The speed and speed auto commands supersede each other, and whichever is configured last takes
effect.
IP network
Server 1 Server 2 Server 3
Router A
GE3/
1/1
G
E3/
1/3
GE3/1/4