auto speed

Function

The auto speed command configures the auto-negotiation rate of an Ethernet electrical interface.

The undo auto speed command restores the default auto-negotiation rate of an Ethernet electrical interface.

By default, Ethernet electrical interfaces on both ends can negotiate to any rate they support.

Format

auto speed { 10 | 100 | 1000 | 2500 | 5000 | 10000 } ^*

undo auto speed

Parameters

Parameter	Description	Value
10	Sets the auto-negotiation rate of an Ethernet electrical interface to 10 Mbit/s.	-
100	Sets the auto-negotiation rate of an Ethernet electrical interface to 100 Mbit/s.	-
1000	Sets the auto-negotiation rate of an Ethernet electrical interface to 1000 Mbit/s. NOTE: FE electrical interfaces do not support this parameter.	-
2500	Sets the auto-negotiation rate of an Ethernet electrical interface to 2500 Mbit/s. NOTE: Only MultiGE interfaces support this parameter.	-
5000	Sets the auto-negotiation rate of an Ethernet electrical interface to 5000 Mbit/s. NOTE: Only MultiGE interfaces support this parameter.	-
10000	Sets the auto-negotiation rate of an Ethernet electrical interface to 10000 Mbit/s. NOTE: Only MultiGE interfaces support this parameter. Only MultiGE interfaces on the S5732-H24UM2CC, S5732-H48UM2CC, S6720-32C-SI-AC, S6720-32C-SI-DC, S6720-32C-PWH-SI-AC, S6720-52X-PWH-SI, S6720-56C-PWH-SI-AC, S6720-56C-PWH-SI, and S6720-32C-PWH-SI support this parameter.	-

Views

Ethernet interface view, GE interface view, MultiGE interface view, port group view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

In auto-negotiation mode, interfaces on both ends of a link negotiate their rate. If the negotiated rate is not the required one, run the auto speed command to set the auto-negotiation rate range to limit the negotiated rate.

For example, the network adapter speeds on Server1, Server2, and Server3 that form a server cluster are all 1000 Mbit/s, and the speed of the outbound interface GE0/0/4 connecting the device to external networks is also 1000 Mbit/s. The servers connect to GE0/0/1, GE0/0/2, and GE0/0/3 respectively. If the auto-negotiation speed is not specified on the device, the speeds negotiated by GE0/0/1, GE0/0/2, and GE0/0/3 with their connected servers are all 1000 Mbit/s. When the servers send data at the speed of 1000 Mbit/s concurrently, the outbound interface GE0/0/4 will be blocked. In this case, you can run the auto speed 100 100 command to configure the auto-negotiation speed to 100 Mbit/s for GE0/0/1, GE0/0/2, and GE0/0/3, preventing the outbound interface from being blocked.

Prerequisites

Run the negotiation auto command to configure the Ethernet interface to work in auto-negotiation mode.

Example

# Configure Ethernet electrical interface GE0/0/1 to work at a rate of 100 Mbit/s in auto-negotiation mode.

<HUAWEI> system-view
[HUAWEI] interface gigabitethernet 0/0/1
[HUAWEI-GigabitEthernet0/0/1] negotiation auto
[HUAWEI-GigabitEthernet0/0/1] auto speed 100