Configuring Crossover Settings - Alcatel OmniSwitch 6624 Network Configuration Manual

Configuring Ethernet Ports
To enable or disable auto negotiation on a single port enter interfaces followed by the slot number, a slash
(/), the port number, autoneg, and either enable or disable. For example, to enable auto negotiation on
port 3 on slot 2 enter:
-> interfaces 2/3 autoneg enable
To enable or disable auto negotiation on a range of ports enter interfaces followed by the slot number, a
slash (/), the first port number, a hyphen (-), the last port number, autoneg, and either enable or disable.
For example, to enable auto negotiation on ports 1 through 3 on slot 2 enter:
-> interfaces 2/1-3 autoneg enable
As an option, you can document the interface type by entering ethernet, fastethernet, or gigaethernet
before the slot number. For example, to enable auto negotiation on port 3 on slot 2 and document the port
as Ethernet enter:
-> interfaces ethernet 2/3 autoneg enable
Please note a link will not be established on any copper Ethernet port if any one of the following is true:
The local port advertises 100 Mbps full duplex and the remote link partner is forced to 100 Mbps full
•
duplex.
The local port advertises 100 Mbps full duplex and the remote link partner is forced to 100 Mbps half
•
duplex.
The local port advertises 10 Mbps full duplex and the remote link partner is forced to 10 Mbps full
•
duplex.
The local port advertises 10 Mbps full duplex and the remote link partner is forced to 10 half duplex.
•
This is due to the fact that when the local device is set to auto negotiating 10/100 full duplex it senses the
remote device is not auto negotiating. Therefore it resolves to Parallel Detect with Highest Common
Denominator (HCD), which is "10/100 Half" according to IEEE 802.3 Clause 28.2.3.1.
However, since the local device is set to auto negotiating at 10/100 full duplex it cannot form a 10/100
Mbps half duplex link in any of the above mentioned cases. One solution is to configure the local device
to auto negotiation, 10/100 Mbps, with auto or half duplex.

Configuring Crossover Settings

To configure crossover settings on a single port, a range of ports, or an entire slot use the
interfaces crossover
accepted.
Setting the crossover configuration to auto will configure the interface or interfaces to automatically
detect crossover settings. Setting crossover configuration to mdix will configure the interface or inter-
faces for MDIX (Media Dependent Interface with Crossover), which is the standard for hubs and switches.
Setting crossover to mdi will configure the interface or interfaces for MDI (Media Dependent Interface),
which is the standard for end stations. And setting the crossover configuration to disable will disable
crossover configuration on an interface or interfaces.
To configure crossover settings on an entire switch enter interfaces followed by the slot number, cross-
over, and the desired setting. For example, to set the crossover configuration to auto on slot 2 enter:
-> interfaces 2 crossover auto
OmniSwitch 6624/6648 Network Configuration Guide
command. If auto negotiation is disabled, auto MDIX and flow enable are not
April 2004
Setting Ethernet Port Parameters
page 1-17