Viewing Port Errors
The switch keeps track of errors for each port and automatically
refreshes the display (this is the default behavior). You can also display a snapshot of the
port errors at the time you issue the command and view the output in a page-by-page mode.
This setting is not saved; therefore, you must specify the no-refresh parameter each time you want
a snapshot of the port errors.
-
View port transmit errors with the following
command:
show ports
{port_list | stack-ports stacking-port-list} txerrors {no-refresh}
The switch collects the following port transmit error information:
- Port Number—The number of the port.
- Link State—The current state of the link. Options are:
- Active (A)—The link is present at this port.
- Ready (R)—The port is ready to accept a link.
- Loopback (L)—The port is configured for WANPHY
loopback.
- Transmit Collisions (TX Coll)—The total number of collisions
seen by the port, regardless of whether a device connected to the port participated in
any of the collisions.
- Transmit Late Collisions (TX Late Coll)—The total number of
collisions that have occurred after the port‘s transmit window has expired.
- Transmit Deferred Frames (TX Deferred)—The total number of
frames that were transmitted by the port after the first transmission attempt was
deferred by other network traffic.
- Transmit Errored Frames (TX Errors)—The total number of frames
that were not completely transmitted by the port because of network errors (such as
late collisions or excessive collisions).
- Transmit Lost Frames (TX Lost)—The total number of transmit
frames that do not get completely transmitted because of buffer problems (FIFO
underflow).
- Transmit Parity Frames (TX Parity)—The bit summation has a
parity mismatch.
-
View port receive errors with the command:
show ports
{port_list | stack-ports stacking-port-list} rxerrors {no-refresh}
The switch collects the following port receive error information:
- Port Number
-
Link State—The current state of the link. Options are:
- Active (A)—The link is present at this port.
- Ready (R)—The port is ready to accept a link.
- Loopback (L)—The port is in Loopback mode.
- Receive Bad CRC Frames (RX CRC)—The total number of frames
received by the port that were of the correct length but contained a bad FCS
value.
- Receive Oversize Frames (RX Over)—The total number of good
frames received by the port greater than the supported maximum length of 1,522
bytes.
- Receive Undersize Frames (RX Under)—The total number of frames
received by the port that were less than 64 bytes long.
- Receive Fragmented Frames (RX Frag)—The total number of frames
received by the port that were of incorrect length and contained a bad FCS value.
- Receive Jabber Frames (RX Jabber)—The total number of frames
received by the port that were greater than the support maximum length and had a
Cyclic Redundancy Check (CRC) error.
- Receive Alignment Errors (RX Align)—The total number of frames
received by the port with a CRC error and not containing an integral number of
octets.
- Receive Frames Lost (RX Lost)—The total number of frames
received by the port that were lost because of buffer overflow in the switch.
-
For SummitStack stacking ports, you can also view transmit
and receive errors with the following commands:
show ports stack-ports
stacking-port-list}txerrors {no-refresh}
show ports stack-ports
{stacking-port-list}rxerrors {no-refresh}
Information displayed is identical to
the details displayed for non-stacking ports.
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