Administrator Guide

Layer 2 Switching Commands 425
• 10 —Configures the port to 10 Mbps operation.
•
100 —Configures the port to 100 Mbps operation.
•
1000 —Configures the port to 1000 Mbps operation.
•
10000 —Configures the port to 10 Gbps operation.
•
40000 —Configures the port to 40 Gbps operation.
•
auto —The port automatically detects the speed it should run based on the
port at the other end of the link. If you use the 10, 100, or 1000 keywords
with the auto keyword, the port only negotiates at the specified speeds.
Default Configuration
Auto-negotiation is enabled by default on copper ports and SFP ports.
Command Mode
Interface Configuration (Ethernet) mode
User Guidelines
To disable auto-negotiation on a port, it is necessary to enter the speed
command without using the auto parameter. Fiber ports do not support
auto-negotiation and therefore require the operator to enter the speed
command with the desired operating bandwidth. Disabling auto-negotiation
on 1G copper ports may lead to random frame loss as the clock master has not
been arbitrated by the auto-negotiation process. Auto-negotiation is required
on 10G/40G copper ports, and is always recommended for copper ports.
When the auto parameter is used with a set of speeds, only those speeds are
advertised during auto-negotiation. Alternatively, if no speed arguments are
configured, then all the speeds which the port is capable of supporting are
advertised. Not all ports support all speeds, even if they are available in the
command. Entering an unsupported speed will produce the following error
message An invalid interface has been used for this
function. 10G fiber ports do not support auto-negotiation. 1G fiber ports
optionally support auto-negotiation. Both ends of fiber connections must be
set to the same speed and auto-negotiation setting.
2CSNXXX_SWUM204.book Page 425 Monday, January 25, 2016 1:25 PM