Brocade ICX 6650 Administration Guide 35
53-1002600-01
Basic port parameter configuration 2
Disabling or re-enabling a port
A port can be made inactive (disable) or active (enable) by selecting the appropriate status option.
The default value for a port is enabled.
To disable port 1/1/1 of a Brocade device, enter the following.
Brocade(config)# interface ethernet 1/1/1
Brocade(config-if-e10000-1/1/1)# disable
You also can disable or re-enable a virtual interface. To do so, enter commands such as the
following.
Brocade(config)# interface ve 1
Brocade(config-vif-1)# disable
Syntax: disable
To re-enable a virtual interface, enter the enable command at the Interface configuration level. For
example, to re-enable virtual interface v1, enter the enable command.
Brocade(config-vif-1)# enable
Syntax: enable
Flow control configuration
Flow control (802.3x) is a QoS mechanism created to manage the flow of data between two
full-duplex Ethernet devices. Specifically, a device that is oversubscribed (is receiving more traffic
than it can handle) sends an 802.3x PAUSE frame to its link partner to temporarily reduce the
amount of data the link partner is transmitting. Without flow control, buffers would overflow,
packets would be dropped, and data retransmission would be required.
All Brocade ICX 6650 devices support asymmetric flow control, meaning they can receive PAUSE
frames but cannot transmit them.

Flow control configuration notes

•Auto-negotiation of flow control is not supported on 10 Gbps and 40 Gbps ports, fiber ports,
and copper or fiber combination ports.
•When any of the flow control commands are applied to a port that is up, the port will be
disabled and re-enabled.
•For 10 Gbps and 40 Gbps ports, the show interface <stack-unit>/<slot>/<port> display shows
Flow Control is enabled or Flow Control is disabled, depending on the configuration.
•When flow-control is enabled, the hardware can only advertise PAUSE frames. It does not
advertise Asym.

Disabling or re-enabling flow control

You can configure the Brocade ICX 6650 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.