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PowerConnect B-Series FCX Configuration Guide 39
53-1002266-01
Configuring basic port parameters
2
Disabling or re-enabling flow control
You can configure the Dell PowerConnect device to operate with or without flow control. Flow
control is enabled by default globally and on all full-duplex ports. You can disable and re-enable
flow control at the Global CONFIG level for all ports. When enabled globally, you can disable and
re-enable flow control on individual ports.
To disable flow control, enter the following command.
PowerConnect(config)# no flow-control
To turn the feature back on, enter the following command.
PowerConnect(config)# flow-control
Syntax: [no] flow-control
NOTE
For optimal link operation, link ports on devices that do not support 803.3u must be configured with
like parameters, such as speed (10,100,1000), duplex (half, full), MDI/MDIX, and Flow Control.
Negotiation and advertisement of flow control
By default, when flow control is enabled globally and auto-negotiation is ON, flow control is enabled
and advertised on 10/100/1000M ports. If auto-negotiation is OFF or if the port speed was
configured manually, then flow control is not negotiated with or advertised to the peer. For details
about auto-negotiation, refer to “Modifying port speed and duplex mode” on page 33.
To disable the advertisement of flow control capability on a port, enter the following commands.
PowerConnect(config)# interface ethernet 0/1/21
PowerConnect(config-if-e1000-0/1/21)# no flow-control
To also disable flow control negotiation, enter the following commands.
PowerConnect(config)# interface ethernet 0/1/21
PowerConnect(config-if-e1000-0/1/21)# no flow-control neg-on
Syntax: [no] flow-control [neg-on]
• flow-control [default] - Enable flow control, flow control negotiation, and advertise flow control
• no flow-control neg-on - Disable flow control negotiation
• no flow-control - Disable flow control, flow control negotiation, and advertising of flow control
Commands may be entered in IF (single port) or MIF (multiple ports at once) mode.
Example
PowerConnect(config)# interface ethernet 0/1/21
PowerConnect(config-if-e1000-0/1/21)# no flow-control
This command disables flow control on port 0/1/21.
PowerConnect(config)# interface ethernet 0/1/11 to 0/1/15
PowerConnect(config-mif-0/1/11-0/1/15)# no flow-control
This command disables flow control on ports 0/1/11 to 0/1/15.