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Port Features
21
port and react accordingly. In other words, auto-negotiation may “agree”
upon a configuration that the cable cannot sustain; smart auto-sensing
can detect this and adjust the link accordingly.
For example, smart auto-sensing can detect network problems, such as
an unacceptably high error rate or a poor quality cable. If both ends of
the link support 100/1000 Mbps auto-negotiation, then auto-sensing
tunes the link to 100 Mbps to provide an error-free 100 Mbps connection
to the network.
An SNMP Trap is sent every time a port is down-rated to a lower speed.
Conditions that affect smart auto-sensing:
■
Smart auto-sensing will not operate on links that do not support
auto-negotiation, or on links where one end is at a fixed speed. The
link will reset to the higher speed of operation when the link is lost or
the unit is power cycled.
■
Smart auto-sensing can only be configured per unit and not on a per
port basis.