Disabling Or Re-Enabling A Port; Flow Control Configuration - Brocade Communications Systems FastIron Administration Manual

Disabling or re-enabling a port

To turn off automatic MDI/MDIX detection and define a port as an MDIX only port.
device(config-if-e1000-2)# mdi-mdix mdix
To turn on automatic MDI/MDIX detection on a port that was previously set as an MDI or MDIX port.
device(config-if-e1000-2)# mdi-mdix auto
Syntax: mdi-mdix[ mdi | mdix | auto ]
After you enter the mdi-mdix command, the Brocade device resets the port and applies the change.
To display the MDI/MDIX settings, including the configured value and the actual resolved setting (for
mdi-mdix auto), enter the command show interface at any level of the CLI.
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 8 of a Brocade device, enter the following.
device(config)
# interface ethernet 8
device(config-if-e1000-8)# disable
You also can disable or re-enable a virtual interface. To do so, enter commands such as the following.
device(config)
# interface ve v1
device(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.
device(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 FastIron devices support asymmetric flow control, meaning they can receive PAUSE frames but
cannot transmit them. In addition, FCX and ICX devices also support symmetric flow control, meaning
they can both receive and transmit 802.3x PAUSE frames. For details about symmetric flow control,
refer to
64
Symmetric flow control on FCX and ICX devices on page 67.
FastIron Ethernet Switch Administration Guide
53-1003625-01