Configure Advanced Switch Settings - Intel 470F - NetStructure Switch User Manual

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Configure Advanced...
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470T Ch5 - Sec 1-Nav & Config.p65
R 5 Intel® NetStructure™ 470T and 470F Switches User Guide

Configure Advanced Switch Settings

Description
Auto-partition capability on all ports: If this option is enabled, the
switch partitions the port when more than 61 collisions occur consecutively
while receiving data. The first time the switch receives a good packet it
then unpartitions the port. If a port is partitioned the switch can transmit
data over this port, but not receive data.
Head of Line (HOL) Blocking Prevention: If this option is enabled it
prevents the forwarding of data to a port that is blocked. Normally, when
the switch sends traffic out from a port, the data goes to the port's transmit
queue and then is sent out. If the port's transmit queue is already busy
trying to send out data then the switch will place the waiting traffic in the
buffer memory until the port is ready to send it out.
However, if the port's transmit queue remains full, the switch will fill up
more of the buffer with traffic waiting to be sent on that port. HOL
blocking works on the assumption that it is better to drop the traffic waiting
in the buffer than to continue using more memory and impacting
performance across all the ports.
High-priority packet service ratio: This option lets you determine how
many high-priority packets are sent out by the switch before sending a low-
priority packet. For example, a ratio of 8 high:1 low means that the switch
will send out eight high-priority packets before sending out one low-
priority packet.
54 4/12/00, 10:21 AM