INS_CNXE2GE2TX8MSPOE 11 Jan 2021 PAGE 74
INSTALLATION AND OPERATION MANUAL
CNXE2GE2TX8MSPOE
TECH SUPPORT: 1.888.678.9427
Label
Description
Advertise Speed
When Speed is set as auto i.e auto negotiation, the port will only
advertise the specified speeds (10M 100M 1G) to the link partner. By
default port will advertise all the supported speeds if speed is set as
Auto.
Flow Control
When Auto Speed is selected on a port, this section indicates the flow
control capability that is advertised to the link partner.
When a fixed-speed setting is selected, that is what is used. The Current
Rx column indicates whether pause frames on the port are obeyed, and
the Current Tx column indicates whether pause frames on the port are
transmitted. The Rx and Tx settings are determined by the result of the
last Auto Negotiation. Check the configured column to use flow control.
This setting is related to the setting for Configured Link Speed.
NOTICE: The 100FX standard doesn’t support Auto Negotiation, so
when in 100FX mode the flow control capabilities will always be shown
as “disabled”.
PFC
When PFC (802.1Qbb Priority Flow Control) is enabled on a port then
flow control on a priority level is enabled. Through the Priority field,
range (one or more) of priorities can be configured, e.g. ‘0-3,7’ which
equals ‘0,1,2,3,7’. PFC is not supported through auto negotiation. PFC
and Flow control cannot both be enabled on the same port.
Maximum Frame Size
Enter the maximum frame size allowed for the switch port, including FCS.
The range is 1518-10240 bytes.
Excessive Collision Mode
Configure port transmit collision behavior.
Discard: Discard frame after 16 collisions (default).
Restart: Restart backoff algorithm after 16 collisions.
Frame Length Check
Configures if frames with incorrect frame length in the EtherType/Length
field shall be dropped. An Ethernet frame contains a field EtherType
which can be used to indicate the frame payload size (in bytes) for
values of 1535 and below. If the EtherType/Length field is above 1535, it
indicates that the field is used as an EtherType (indicating which protocol
is encapsulated in the payload of the frame). If “frame length check” is
enabled, frames with payload size less than 1536 bytes are dropped, if
the EtherType/Length field doesn’t match the actually payload length. If
“frame length check” is disabled, frames are not dropped due to frame
length mismatch. Note: No drop counters count frames dropped due to
frame length mismatch