Intel 480T, User Manual

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A P P E N D I X B
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The only way to establish a full duplex link is to either force it at
both sides, or run auto-negotiation on both sides (using full duplex
as an advertised capability, which is the default setting on the 480T
switch).
A mismatch of duplex mode between the 480T switch and another
network device will cause poor network performance. Viewing
statistics using the
show port rx
command on the 480T switch
may display a constant increment of CRC errors. This is
characteristic of a duplex mismatch between devices. This is NOT
a problem with the 480T switch.
Always verify that the switch and the network device match in
configuration for speed and duplex.
No link light on Gigabit fiber port:
Check to ensure that the transmit fiber goes to the receive fiber side
of the other device, and vice-versa. All gigabit fiber cables are of the
cross-over type.
The switch has auto-negotiation set to on by default for gigabit
ports. These ports need to be set to auto off (using the command
config port <port #> auto off
) if you are connecting it to
devices that do not support auto-negotiation.
Ensure that you are using multi-mode fiber (MMF) when using a
1000BASE-SX GBIC, and single mode fiber (SMF) when using a
1000BASE-LX GBIC. 1000BASE-SX does not work with SMF.
1000BASE-LX works with MMF, but requires the use of a mode
conditioning patchcord (MCP).
VLANs
You cannot add a port to a VLAN:
If you attempt to add a port to a VLAN and get an error message
similar to
localhost:7 # config vlan marketing add port
1:1,1:2
ERROR: Protocol conflict on port 1:5
you already have a VLAN using untagged traffic on a port. Only
one VLAN using untagged traffic can be configured on a single
physical port.