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Cajun P550/P880/P882 Switch User Guide
Configuring Port Parameters
5-25
Configuring
Physical Port
Parameters on
Fast Ethernet
Ports Using the
CLI
To configure ports on a Fast Ethernet module using the CLI, enter
the following command from Priv mode:
cajun# port set <options>
Refer to the Cajun P500/P880/P882 Switch Command Line Interface
Reference Guide for more details about this command.
Auto
Negotiation
Mode
Select 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
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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.
Rate Limit
Mode
Prevents the switch from overwhelming the output
buffer on lower-speed ports by placing a threshold on
the percentage of port traffic that can be flooded
packets (unknown unicasts and multicasts).
You can also optionally include known multicast
packets in this percentage to further decrease the
possibility of the port’s output buffer that is being
overwhelmed.
Rate Limit Rate Determines the percentage of a port’s forwarded
traffic that can be unknown unicast and multicast
(flooded). Lower this value if the port has overflow
problems.
Rate Limit Burst
Size
Enter a value for the limit of packets allowed in a
single burst. Accepted values are 1 to 2048. For Fast
Ethernet ports, set this value lower than 1024
(output buffer capacity). Lower this value if the port
has overflow problems.
Port PACE
Priority
Select Enable to allow the port to detect 3Com’s
proprietary PACE format as packets pass through the
port. PACE allows a packet’s priority (higher priority
packets move through the switch before lower
priority packets) to be set at the adapter.
Table 5-5. Fast Ethernet (10/100) Port Parameters continued
Parameter Definition