2-26
Chapter 2
Cajun P550/P880 Manager User Guide
Speed Mode
Allows you to select the speed of the port manually
(to either 10 or 100 Mbps).
Note:
If auto-negotiation is enabled, this setting
is ignored.
Duplex Mode
Allows you set the port duplex mode (half- or full-
duplex).
Note:
If auto-negotiation is enabled, this setting
is ignored.
Flow Control
Mode
Determines whether 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 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-negotiation 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
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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.
Table 2-4. Fast Ethernet (10/100) Port Parameters
Parameter Definition
