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SmartStack STS16-20D/STS16-20R Token Ring Switches Installation and User Guide Switch Configuration
Force AC Bits on SR Frames
This field specifies if AC bits will be set unconditionally when a port forwards
certain LLC frames. Possible values are
Yes
and
No
(default).
BRF MTU (actual)
Display only. The MTU the BRF uses at the moment.
Port MTU
Configures the Maximum Transmission Unit size of the information field of
packets to be sent or received. Possible values are
1,500
and
4,472
,
8,144
,
17,800
and
USE Brf
(default).
The actual value used is the lower of the configured value and the actual BRF MTU.
➽ Note!
See the description on frame length limit on page 41 in Chapter 3, “Preparing
for Installation”.
Forwarding Mode
The forwarding mode that will be used by this port, when forwarding frames to
other ports in this box. Cut-through is possible only if all exit ports are running 16
Mbps. Possible values are
auto
,
cut-through
, and
store & forward
. The default is
auto
. If the forwarding mode is set to
auto
, the actual mode will depend on the
number of errors that occur on this port during the sampling interval. If the error
rate is below the error low threshold,
cut-through
mode is used. If the error rate is
above the
Error High Threshold
value,
store & forward
is used. The
store &
forward
mode is always used for ports with a media speed of 4 Mbps.
Error High Threshold
This field is only valid when
Forwarding Mode
is set to
auto
. It is used to force a
port to
store & forward
mode when the percentage of errors detected in the
Error
Sampling Interval
is greater than the
Error High Threshold
. Possible values are
0
–
100
percent. The default value is
10
percent.
Error Low Threshold
This field is only valid when
Forwarding Mode
is set to
auto
. It is used to return
a port to cut-through mode when the percentage of errors detected in the
Error
Sampling Interval
is less than the
Error Low Threshold
. Possible values are
0
–
100
percent. The default value is
1
percent.
Error Sampling Interval
This field is only valid when
Forwarding Mode
is set to
auto
. It specifies a
sampling period in minutes. The sampling period is used when counting errors to
determine a port’s forwarding mode. Possible values are
1
–
60
minutes. The default
value is
10
.