LevelOne FGL-2870 - Manual (Page 212)

Configuring the Switch
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trunk. If not used, the success of the link process cannot be guaranteed when
connecting to other types of switches. However, this switch does provide a means
of safely forcing a link to operate at 1000 Mbps, full-duplex using the Giga Phy
Mode attribute described below.
Command Attributes
• Name – Allows you to label an interface. (Range: 1-64 characters)
• Admin – Allows you to manually disable an interface. You can disable an interface
due to abnormal behavior (e.g., excessive collisions), and then re-enable it after
the problem has been resolved. You may also disable an interface for security
reasons.
• Speed/Duplex – Allows you to manually set the port speed and duplex mode.
(i.e., with auto-negotiation disabled)
• Flow Control – Allows automatic or manual selection of flow control.
• Giga PHY Mode – Forces two connected ports into a master/slave configuration
to enable 1000BASE-T full duplex for Gigabit ports 25-28/49-52. The following
options are supported:
- Master - Sets the selected port as master.
- Slave - Sets the selected port as slave.
- Auto Prefer Master - Uses master mode as the initial configuration setting
regardless of the mode configured at the other end of the link.
- Auto Prefer Slave - Uses slave mode as the initial configuration regardless of
the mode configured at the other end of the link.
To force 1000full operation requires the ports at both ends of a link to establish their
role in the connection process as a master or slave. Before using this feature,
auto-negotiation must first be disabled, and the Speed/Duplex attribute set to
1000full. Then select compatible Giga PHY modes at both ends of the link. Note
that using one of the preferred modes ensures that the ports at both ends of a link
will eventually cooperate to establish a valid master-slave relationship.
• Autonegotiation (Port Capabilities) – Allows auto-negotiation to be enabled/
disabled. When auto-negotiation is enabled, you need to specify the capabilities to
be advertised. When auto-negotiation is disabled, you can force the settings for
speed, mode, and flow control.The following capabilities are supported.
- 10half - Supports 10 Mbps half-duplex operation
- 10full - Supports 10 Mbps full-duplex operation
- 100half - Supports 100 Mbps half-duplex operation
- 100full - Supports 100 Mbps full-duplex operation
- 1000full (Gigabit ports only) - Supports 1000 Mbps full-duplex operation
- Sym (Gigabit only) - Check this item to transmit and receive pause frames, or
clear it to auto-negotiate the sender and receiver for asymmetric pause frames.
(The current switch chip only supports symmetric pause frames.)
- FC - Flow control can eliminate frame loss by “blocking” traffic from end stations
or segments connected directly to the switch when its buffers fill. When enabled,
back pressure is used for half-duplex operation and IEEE 802.3-2005 (formally
IEEE 802.3x) for full-duplex operation.