Brocade Communications Systems 6650 manual Modifying port duplex mode

2 Basic port parameter configuration

The port speed down-shift and maximum port speed advertisement features operate dynamically at the physical link layer, independent of logical trunk group configurations. Although Brocade recommends that you use the same cable types and auto-negotiation configuration on all members of a trunk group, you could utilize the auto-negotiation features conducive to your cabling environment. For example, in certain circumstances, you could configure each port in a trunk group to have its own auto-negotiation maximum port speed advertisement or port speed down-shift configuration.

Maximum port speed application notes

•Port speed down-shift and maximum port speed advertisement work only when auto-negotiation is enabled (CLI command speed-duplex auto). If auto-negotiation is OFF, the device will reject the port speed down-shift and maximum port speed advertisement configuration.

•When port speed down-shift or maximum port speed advertisement is enabled on a port, the device will reject any configuration attempts to set the port to a forced speed mode (100 Mbps or 1000 Mbps).

•When the port speed down-shift feature is enabled on a combo port, the port will not support true media automatic detection, meaning the device will not be able to detect and select the fiber or copper connector based on link availability.

Modifying port duplex mode

You can manually configure a 10/100 Mbps port to accept either full-duplex (bi-directional) or half-duplex (uni-directional) traffic.

NOTE

You can modify the port duplex mode of copper ports only. This feature does not apply to fiber ports.

Port duplex mode and port speed are modified by the same command.

Port duplex mode configuration syntax

To change the port speed of interface 1/1/1 from the default of 10/100/1000 auto-sense to 10 Mbps operating at full-duplex, enter the following.

Brocade(config)# interface ethernet 1/1/1

Brocade(config-if-e10000-1/1/1)# speed-duplex 10-full

Syntax: speed-duplex <value>

The <value> can be one of the following:

•10-full

•10-half

•100-full

•100-half

•auto (default)

34	Brocade ICX 6650 Administration Guide
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