Speed/Duplex Negotiation - Dell PowerConnect B-RX Configuration Manual

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Speed/Duplex negotiation

Speed/Duplex negotiation
Speed/Duplex Negotiation detects the speed (10MBps, 100Mbps, 1000Mbps) and duplex
(half-duplex or full-duplex) settings of the device on the other end of the wire and subsequently
adjusts to match those settings.
Each of the 10/100/1000BaseTX ports is designed to auto-sense and auto-negotiate the speed
and mode of the connected device. If the attached device does not support this operation, you can
manually enter the port speed.
You can configure a port to accept either full-duplex (bi-directional) or half-duplex (uni-directional)
traffic. Port duplex mode and port speed are modified by the same command.
The master and slave parameters are applicable only if the speed parameter is set to 1000. The
value for this parameter must correspond to the value on the link partner--for example, if the local
link has a value of master, the link partner must have a value of slave.
On 1000 Gigabit, auto-negotiation determines which side of the link is master and which side is
slave.
NOTE
You can not force a full duplex speed on CuSFP when using two 24C's. Setting both sides to 100-full
and using gig links or actual 24C's is recommended for switch uplinks. Host PC's that are connected
are not affected.
NOTE
Modifying the port speed of a port that has a pre-configured rate limit policy may result in the
inability to remove the port's rate limit policy.
NOTE
Brocade recommends using gig links or 24C's links for switch uplinks when transmitting Layer 2
Traffic in a bidirectional patterns.
NOTE
To force the port to run at 1000 Mbps, set one of the link's ports to be the master for the link. To set
a port as a Gigabit master port, enter the following command at the interface configuration level for
the port:
NOTE
Modifying the port speed of a port that has a pre-configured rate limit policy may result in the
inability to remove the port's rate limit policy.
The following example configures the interface to 1000 Mbps, and designates it as the master
port.
To force the port to run at 1000 Mbps, set one of the link's ports to be the master for the link. To
set a port as a Gigabit master port, enter the following command at the interface configuration
level for the port.
BigIron RX(config)#interface ethernet 1/5
BigIron RX(config-if-e10000-1/5)#speed-duplex 1000-master
The following example configures the interface to 1000 Mbps, and designates it as the slave port.
140 BigIron RX Series Configuration Guide
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