Example for Configuring the Rate and Duplex Mode of an Ethernet Interface

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Overview

Interfaces can work in the following two duplex modes:
  • Half-duplex mode: An interface in this mode can send data only when it is not receiving data and, conversely, it can receive data only when it is not sending data. A limit on the transmission distance applies to this mode.
  • Full-duplex mode: An interface in this mode can send and receive data simultaneously. The maximum throughput in full-duplex mode is theoretically double that in half-duplex mode. There is no limit on the transmission distance in this mode.
You can configure the rate and duplex mode of an Ethernet interface working in either auto-negotiation or non-auto-negotiation mode.
  • In auto-negotiation mode, interfaces at both ends of a link negotiate the rate and duplex mode. If the negotiation succeeds, the two interfaces use the same duplex mode and rate. The auto-negotiation function takes effect only when both the connected devices support it. If the remote device does not support auto-negotiation or uses a different auto-negotiation mode, the connected interfaces may be Down.
  • You can configure the local interface to work in non-auto-negotiation mode and manually configure the interface rate and duplex mode in the following situations:

    The remote device does not support auto-negotiation.

    After auto-negotiation is configured, the local and remote devices cannot communicate.

    After auto-negotiation is configured, the physical link between the local and remote devices is connected, but many error packets are generated or packet loss occurs.

Configuration Notes

  • Usage restrictions
    • Ethernet interfaces at both ends of a link must work in the same auto-negotiation mode. Otherwise, the interfaces may be Down.

    • When the working rate of a GE electrical interface is 1000 Mbit/s, the interface supports only the full-duplex mode and does not need to negotiate the duplex mode with the remote interface.

    • Interfaces at both ends of a link must use the same rate and duplex mode.

    • Rate and duplex mode of Ethernet interfaces lists the rate and duplex mode of Ethernet interfaces.

Networking Requirements

As shown in Figure 5-2, Server1, Server2, and Server3 form a server cluster and connect to GE1/0/1, GE1/0/2, and GE1/0/3 of the Switch respectively. The Switch connects to the Internet through GE1/0/4.

Due to limitations of network adapters on the servers, GE1/0/1, GE1/0/2, and GE1/0/3 can only work in half-duplex mode after negotiating with connected server interfaces. As a result, packet loss occurs when the service traffic volume is high. In addition, the rate is negotiated to 1000 Mbit/s for GE1/0/1, GE1/0/2, and GE1/0/3. When the three servers concurrently send data at the rate of 1000 Mbit/s, the outbound interface GE1/0/4 will be congested. Users require that packet loss and congestion do not occur.

Figure 5-2  Networking diagram for configuring the rate and duplex mode in non-auto-negotiation mode 
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Configuration Roadmap

The configuration roadmap is as follows:

  • Configure the switch interfaces to work in non-auto-negotiation mode to prevent the interface rate from being affected by the network adapter rate on the servers.
  • Set the duplex mode to full-duplex for the interfaces working in non-auto-negotiation mode to avoid packet loss.

  • Set the rate to 100 Mbit/s for the interfaces working in non-auto-negotiation mode to avoid congestion on the outbound interface.

Procedure

  1. Create a port group and add GE1/0/1, GE1/0/2, and GE1/0/3 to the port group.

    <HUAWEI> system-view[HUAWEI] sysname Switch[Switch] port-group portgroup1   //Create a permanent port group portgroup1.[Switch-port-group-portgroup1] group-member  GE1/0/1 to  GE1/0/3   //Add GE1/0/1,GE1/0/2, and GE1/0/3 to portgroup1.

  2. Configure GE1/0/1, GE1/0/2, and GE1/0/3to work in non-auto-negotiation mode, and set the duplex mode to full-duplex and rate to 100 Mbit/s for these interfaces in a batch.

    [Switch-port-group-portgroup1] undo negotiation auto   //Configure interfaces to work in non-auto-negotiation mode in a batch.[Switch-GigabitEthernet1/0/1] undo negotiation auto[Switch-GigabitEthernet1/0/2] undo negotiation auto[Switch-GigabitEthernet1/0/3] undo negotiation auto[Switch-port-group-portgroup1] duplex full   //Set the duplex mode of the interfaces to full-duplex in a batch.[Switch-GigabitEthernet1/0/1] duplex full[Switch-GigabitEthernet1/0/2] duplex full[Switch-GigabitEthernet1/0/3] duplex full[Switch-port-group-portgroup1] speed 100   //Set the rate of the interfaces to 100 Mbit/s in a batch.[Switch-GigabitEthernet1/0/1] speed 100[Switch-GigabitEthernet1/0/2] speed 100[Switch-GigabitEthernet1/0/3] speed 100[Switch-port-group-portgroup1] quit

  3. Verify the configuration.

    Run the display interface gigabitethernet 1/0/1 command in any view to check the interface rate and duplex mode.

    [Switch] display interface gigabitethernet 1/0/1...
    Port Mode: COMMON COPPER                                                        
    Speed : 100,    Loopback: NONE                                                  
    Duplex: FULL,   Negotiation: DISABLE                                            Mdi   : AUTO,   Flow-control: DISABLE  
    ...

    The command output shows that the interface works in non-negotiation mode, the rate is 100 Mbit/s, and the duplex mode is full-duplex.

    Similarly, run the display interface gigabitethernet 1/0/2 and display interface gigabitethernet 1/0/3 commands on GE1/0/2 and GE1/0/3respectively to check interface working information.

Configuration File

Switch configuration file

#
 sysname Switch#
interface GigabitEthernet1/0/1
 undo negotiation auto
 speed 100
#
interface GigabitEthernet1/0/2
 undo negotiation auto
 speed 100
#
interface GigabitEthernet1/0/3
 undo negotiation auto
 speed 100
#
port-group portgroup1         
 group-member GigabitEthernet1/0/1       
 group-member GigabitEthernet1/0/2        
 group-member GigabitEthernet1/0/3       #
return

Rate and duplex mode of Ethernet interfaces

Interface Type

Rate and Duplex mode

MultiGE interfaces

  • Transmission medium: network cable
  • Rate: 100 Mbit/s, 1000 Mbit/s, 2500 Mbit/s, 5000 Mbit/s, and 10 Gbit/s
  • Duplex mode: When the rate is 100 Mbit/s, full-duplex and half-duplex are supported. When the rate is 1000 Mbit/s, 2500 Mbit/s, 5000 Mbit/s, and 10 Gbit/s, only full-duplex is supported.
  • Auto-negotiation: supported
NOTE:
  • Only the S5720-14X-PWH-SI-AC, S5720-28X-PWH-LI-AC, S5720-28X-PWH-LI-ACF, 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 MultiGE interfaces.
  • You can set the rate of a MultiGE interface to 100 Mbit/s and duplex mode to half-duplex only when the interface works in auto-negotiation mode on the S5720-14X-PWH-SI-AC. This limitation does not apply to MultiGE interfaces on other switches.

FE electrical interfaces

  • Transmission medium: network cable
  • Rate: 10 Mbit/s and 100 Mbit/s
  • Duplex mode: full-duplex/half-duplex
  • Auto-negotiation: supported

GE electrical interfaces

  • Transmission medium: network cable
  • Rate: 10 Mbit/s and 100 Mbit/s and 1000 Mbit/s
  • Duplex mode: full-duplex/half-duplex. When the rate is 1000 Mbit/s, only full-duplex is supported.
  • Auto-negotiation: supported
NOTE:
  • Physical interfaces of the S6720EI, S6720HI, and S6720S-EI do not support the half duplex mode.

  • Physical interfaces of the X series cards on a modular switch do not support the half duplex mode.

XGE (10GE) electrical interfaces

  • Transmission medium: network cable
  • Rate: 10000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: supported
NOTE:

Only ES5D21X08T00 card of the S5730HI and ES5D21X02T01 card of the S5720EI support XGE electrical interfaces.

FE optical interfaces

  • Transmission medium: FE optical module
  • Rate: 100 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: not supported

GE optical interfaces

When the transmission medium is an FE optical module:
  • Rate: 100 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: not supported
When the transmission medium is a GE optical module:
  • Rate: 100 Mbit/s and 1000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: supported
When the transmission medium is a GE copper module:
  • Rate: 10 Mbit/s, 100 Mbit/s, and 1000 Mbit/s
  • Duplex mode: full-duplex/half-duplex. When the rate is 1000 Mbit/s, only full-duplex is supported.
  • Auto-negotiation: supported
NOTE:

By default, auto-negotiation is enabled on GE optical interfaces and rate auto-negotiation is disabled. You can run the speed auto-negotiation command to enable rate auto-negotiation.

After a GE interface on the S5700SI, S5700EI, or S5700HI has a GE copper module installed, the interface can go Up. However, you cannot configure the rate, duplex mode, and auto-negotiation mode on the interface.

XGE (10GE) optical interfaces

When the transmission medium is an XGE optical module:
  • Rate: 10000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: not supported
When the transmission medium is a GE optical module:
  • Rate: 1000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: supported
When the transmission medium is a GE copper module:
  • Rate: 100 Mbit/s and 1000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: supported
When the transmission medium is an XGE/GE optical module:
  • Rate: 1000 Mbit/s and 10000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: not supported
NOTE:
  • Assume that an XGE optical interface has an XGE/GE optical module installed and the interface rate is set to 1000 Mbit/s by running the speed auto 1000 command. When you run the display interface command on the interface, the command output shows that auto-negotiation is enabled. However, you cannot run the negotiation auto command to configure the auto-negotiation mode.

  • Only modular switches running V200R007 and later versions support XGE/GE optical modules.

  • Only the ES5D21X02T01 card of the S5720EI and the ES5D21X08S00 card of the S6720EI and S5730HI support XGE electrical interfaces.

  • Only XGE optical interfaces on the S6720EI and S6720S-EI running V200R009 and later versions can automatically negotiate the rate to 100 Mbit/s after having GE copper modules installed.

40GE optical interfaces

When the transmission medium is a 40GE optical module
  • Rate: 40000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: not supported
When the transmission medium is a high-speed cable:
  • Rate: 40000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: supported
NOTE:

When you run the display interface command on a 40GE optical interface that has a high-speed cable installed, the command output shows that auto-negotiation is enabled. However, you cannot run the negotiation auto command to configure the auto-negotiation mode.

100GE optical interfaces

  • Transmission medium: 100GE optical module
  • Rate: 100000 Mbit/s
  • Duplex mode: full-duplex
  • Auto-negotiation: not supported
NOTE:

Only the S6720HI supports 100GE optical interfaces.

See more please click 

https://support.huawei.com/enterprise/en/doc/EDOC1000069520/9aadccc0/comprehensive-configuration-examples



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