Lucent Technologies P550 - Manual (Page 57)

Configuring the Cajun P550 Switch (Layer 2 & Layer 3)
Cajun P550/P220 Switch Operation Guide 3 -11
Table 3-5 describes the Fast Ethernet port parameters:
Table 3-5. Fast Ethernet (10/100) Port Parameters
Parameter Definition
Name A user-assigned name for this port (possibly a drop name or the
name of the station or other device connected to the port).
Category Allows you to select either User Port or Service Port.
• The User Port is intended for use with switch connections to
end user nodes.
• The Service Port is intended for use with switch connections
to servers or other switches. The Service Port allows the
switch to generate both log messages and alarm messages
(traps). The User Port only generates log messages,
preventing your network management station from being
overwhelmed by port up/down messages that result from
users turning workstations on and off.
Speed Mode Allows you to select the speed of the port manually (to either 10
or 100 Mb/s). If auto-negotiation is enabled, this setting is
ignored.
Duplex Mode Allows you set the port duplex mode (half- or full-duplex). If
auto-negotiation is enabled, this setting is ignored.
Flow Control Mode Determines if flow control is used on this port. For half-duplex
links, active backpressure jams the sending Ethernet channel
until the port’s buffers can receive more packets. This prevents
lost or dropped packets.
For full-duplex links, IEEE 802.3z pause control allows the port
to stop a sending station from sending more packets if the
receiving port’s buffers are full.
For TX and FX ports, there is an additional option for Enable
with Aggressive Backoff. This option limits the size of the bursts.
Flow Control is recommended for use primarily on end-station
connections. Using this flow control on trunk ports can cause
unnecessary congestion on the network.
Auto Negotiation
Mode Allows you to set the port to auto-negotiate a speed and duplex
mode. Auto-negotiate works best when the connection on the
other end of the link is set to auto-negotiate as well. If you set a
port to auto-negotiate, and the connection is not successful, set
the port speed and duplex mode manually.
Auto Negotiation
Speed/Duplex
Advertisement Determines what information the port advertises when it starts
auto-negotiating. In most cases, 10/100 and Half/Full are the
best settings, but there may be cases when you want to
auto-negotiate one parameter, while keeping the other fixed.