Modular Ethernet Switch User’s Guide
Using the Console Interface
73
♦
Bad Fragment
The number of packets less than 64 bytes with either bad framing or an invalid CRC.
These are normally the result of collisions.
♦
Jabber
The number of frames with length more than 1536 bytes and with CRC error or misalignment
(bad framing).
♦
Late Collision
The number of collisions that occur at or after the 64
th
byte (octet) in the frame.
♦
Mac Rx Error
The number of frames with received MAC Errors.
♦
Dropped Frames
The number of frames which are dropped by this port since the last Switch reboot.
♦
Undersize Frames
The number of frames detected that are less than the minimum permitted frame
size of 64 bytes and have a good CRC. Undersize frames usually indicate collision fragments, a normal
network occurrence.
♦
Total errors
The sum of the CRC Error, Oversize, Bad Fragment, Jabber, Late Collision, Mac Rx
Error, Dropped Frames, and Undersize Frames counters.
♦
Collisions
The number of times packets have collided on this port.
Port Packet Analysis Statistics
To access the fourth item on the
Traffic Statistics
menu, choose
Port
Packet
Analysis Statistics
. The
following table appears:
Figure 6-60. Port Packet Analysis table
Select the desired module in the Module
field, the desired port in the Port field, and the desired increment
setting in the Update Interval
field:
5 sec
,
15 sec
,
30 sec
,
1 min
, or
Suspend
.
The statistic counters displayed are defined as follows:
♦
64
,
65-127
,
128-255
,
256-511
,
512-1023
,
1024-1536
The number of good frames of various length
ranges, both valid and invalid.
♦
RX (GOOD)
The number of good frames received. This also includes local and dropped packets.
♦
TX (GOOD)
The number of good frames sent from the respective port.
♦
Total RX
The number of frames received, good and bad.
♦
TX Octets
The number of good bytes sent from the respective port.
♦
RX Octets
The number of good bytes received. This also includes local and dropped packets.
♦
Total RX
The number of bytes received, good and bad.
♦
Unicast RX/Unicast TX
The number of good unicast frames received and sent. This includes dropped
unicast packets.
♦
Multicast RX/Multicast TX
The number of good multicast frames received and sent. This includes
local and dropped multicast packets.