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100 Mbps,
Full−duplex
100 Mbps,
Full−duplex
100 Mbps,
Half−duplex
Duplex
Mismatch
1
AUTO 100 Mbps,
Full−duplex
100 Mbps,
Half−duplex
100 Mbps,
Full−duplex
Duplex
Mismatch
1
100 Mbps,
Full−duplex 100 Mbps,
Full−duplex
100 Mbps,
Full−duplex
100 Mbps,
Full−duplex
Correct
Manual
Configuration
2
100 Mbps,
Half−duplex
AUTO
100 Mbps,
Half−duplex
100 Mbps,
Half−duplex
Link is
established, but
switch does not
see any
autonegotiation
information
from NIC and
defaults to
half−duplex
when operating
at 10/100 Mbps.
10 Mbps,
Half−duplex
AUTO
10 Mbps,
Half−duplex
10 Mbps,
Half−duplex
Link is
established, but
switch does not
see Fast Link
Pulse (FLP) and
defaults to 10
Mbps
half−duplex.
10 Mbps,
Half−duplex 100 Mbps,
Half−duplex
No Link No Link
Neither side
establishes link,
due to speed
mismatch.
AUTO 100 Mbps,
Half−duplex
100 Mbps,
Half−duplex
100 Mbps,
Half−duplex
Link is
established, but
NIC does not
see any
autonegotiation
information and
defaults to 100
Mbps,
half−duplex.
AUTO 10 Mbps,
Half−duplex
10 Mbps,
Half−duplex
10 Mbps,
Half−duplex
Link is
established, but
NIC does not
see FLP and
defaults to 10
Mbps,
half−duplex.
1
A duplex mismatch can result in performance issues, intermittent connectivity, and loss of communication.
When you troubleshoot NIC issues, verify that the NIC and switch use a valid configuration.