Qtech QSW-8200-28T-AC — настройка сетевых портов: команды и примеры использования [8/85]

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User Manual

Chapter 1. Commands for Network Port Configuration 8

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 Example: Clearing the statistics for Ethernet port1/0/1.

 Switch#clear counters interface ethernet 1/0/1

1.1.3 description

 Command: description <string>

 no description

 Function: Set name for specified port; the no command cancels this configuration.

 Parameter: <string> is a character string, which should not exceeds 200 characters.

 Command Mode: Port Mode.

 Default: No port name by default.

 Usage Guide: This command is for helping the user manage switches, such as the user

assign names according to the port application, e.g. financial as the name of 1/0/1-2

ports which is used by financial department, engineering as the name of 1/0/9 ports

which belongs to the engineering department, while the name of 1/0/12 ports is

assigned with Server, which is because they connected to the server. In this way the

port distribution state will be brought to the table.

 Example: Specify the description of 1/0/1-2 port as financial.

 Switch(config)#interface ethernet 1/0/1-2

 Switch(Config-If-Port-Range)#description financial

1.1.4 flow control

 Command: flow control

 no flow control

 Function: Enables the flow control function for the port: the “no flow control”

command disables the flow control function for the port.

 Command mode: Port Mode.

 Default: Port flow control is disabled by default.

 Usage Guide: After the flow control function is enabled, the port will notify the sending

device to slow down the sending speed to prevent packet loss when traffic received

exceeds the capacity of port cache. Ports support IEEE802.3X flow control; the ports

work in half-duplex mode, supporting back-pressure flow control. If flow control results

in serious HOL, the switch will automatically start HOL control (discarding some packets

in the COS queue that may result in HOL) to prevent drastic degradation of network

performance.

 Note: Port flow control function is not recommended unless the users need a slow

speed, low performance network with low packet loss. Flow control will not work

between different cards in the switch. When enable the port flow control function,

speed and duplex mode of both ends should be the same.

 Example: Enabling the flow control function in ports 1/0/1-8.

 Switch(config)#interface ethernet 1/0/1-8

 Switch(Config-If-Port-Range)#flow control