Brocade Communications Systems 6650 Disabling or re-enabling a port, Flow control configuration

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.

Brocade ICX 6650 Administration Guide	35
53-1002600-01