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Interfaces and Subnets
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• Link auto-negotiation is enabled - both speed and duplex mode are determined via auto-negotiation, which
should configure the link for highest performance possible for the given link-partner (which will need to be
capable of, and participating in, auto-negotiation for this to happen)
• Auto-crossover mode is enabled - the port will swap Receive and Transmit pairs if required to adapt to cable /
link-partner configuration
• The green port LED is configured to show combined Link Status and Activity indication - the LED will be
off if no link is established with a link-partner. When a link is established (at any speed), the LED will be
on steady when there is no activity, and will blink when there is activity.
• The yellow port LED is configured to show Transmit activity.
When you first create an
ethernet
object you will see that none of the attribute checkboxes are ticked, and
the defaults described above apply. Ensure that you set the
port
attribute value correctly to modify the port
you intended to.
6.4.1. Disabling auto-negotiation
If you are connecting a port to a link-partner that does not support auto-negotiation (or has it disabled), it is
advisable to disable auto-negotiation on the FB6000 port. To do this, tick the checkbox for the
autoneg
attribute and select
false
from the drop-down box. You will then need to set port speed and duplex mode
manually (see below) to match the link-partner settings.
6.4.2. Setting port speed
If auto-negotiation is enabled, the FB6000 port will normally advertise that it is capable of link-speeds of 10Mb/
s, 100Mb/s or 1Gb/s - if you have reason to restrict the possible link-speed to one of these values you can set
the
speed
attribute to 10M, 100M or 1G. This will cause the port to only advertise the specified speed - if the
(auto-negotiate capable) link-partner does not support that speed, the link will fail to establish.
If auto-negotiation is disabled, the
speed
attribute simply sets the port's speed.
6.4.3. Setting duplex mode
If auto-negotiation is enabled, the FB6000 port will normally advertise that it is capable of either half- or full-
duplex operation modes - if you have reason to restrict the operation to either of these modes, you can set the
duplex
attribute to either
half
or
full
. This will cause the port to only advertise the specified mode - if
the (auto-negotiate capable) link-partner does not support that mode, the link will fail to establish.
If auto-negotiation is disabled, the
duplex
attribute simply sets the port's duplex mode.
Note
If you do not set the
autoneg
attribute (checkbox is unticked), and you set both port speed and
duplex mode to values other than
auto
, auto-negotiation will be disabled ; this behaviour is to reduce
the potential for duplex mis-match problems that can occur when connecting the FB6000 to some
vendors' (notably Cisco) equipment that has auto-negotation disabled by default.
6.4.4. Defining port LED functions
For each port, the green and yellow port LEDs can be set to indicate any of the conditions shown in Table 6.2,
by setting the values of the
green
and/or
yellow
attributes.
Table 6.2. Port LED functions
Value
Indication
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