Auto-Negotiation; Device Port Default Settings - Alcatel OS-LS-6224 User Manual

Auto-Negotiation

Auto-negotiation allows a device to advertise modes of operation and share
information with another device that shares a point-to-point link segment. This
automatically configures both devices to take maximum advantage of their abilities.
Auto-negotiation is performed completely within the physical layers during link
initiation, without any additional overhead to either the MAC or higher protocol
layers. Auto-negotiation allows the ports to do the following:
• Advertise their abilities
• Acknowledge receipt and understanding of the common modes of operation that
both devices share
• Reject the use of operational modes that are not shared by both devices
• Configure each port for the highest-level operational mode that both ports can
support
If connecting a port of the switch to the network interface card (NIC) of a terminal
that does not support auto-negotiation or is not set to auto-negotiation, both the
device port and the NIC must be manually set with the Web browser interface or CLI
commands to the same speed and duplex mode.
Note:
If the station on the other side of the link attempts to auto-negotiate with a port that
is manually configured to full duplex, the auto-negotiation results in the station
attempting to operate in half duplex. The resulting mismatch may lead to
significant frame loss. This is inherent in the auto-negotiation standard.

Device Port Default Settings

The following table describes the device port default settings.
Function
Port speed and mode
Port forwarding state
Head of line blocking prevention
Flow Control
Back Pressure
Note:
These default settings can be modified once the device is installed.
The following is an example for changing the port speed on port g1 using CLI
commands:
Console (config)#
Console (config-if)#
Default Settings
100 M or 1000M Auto-negotiation
Enabled
On (Enabled)
Off
Off
interface ethernet
speed
100
General Configuration Information
g1
2
4-380
4-384
15