User`s guide

Gigabit Ethernet Switch User’s Guide
103
♦ Update Interval
Choose the desired setting:
1 second
,
5 seconds
,
15 seconds
,
30 seconds
,
60 seconds
or
Suspend
.
♦ Link Status
Indicates whether the port is online and working (
1000/Full/Flow control off
, for
example) or not (
Link Down
).
Other Errors:
♦ CRC Error
Counts otherwise valid frames that did not end on a byte (octet) boundary.
♦ Oversize Frames
Counts packets received that were longer than 1518 octets (excluding framing
bits, but including FCS octets) and were otherwise well formed.
♦ Fragments
The number of good frames with length less than the 64-byte (octet) minimum defined
by the Ethernet standard. These are usually caused by collisions.
♦ Jabber
Counts frames longer than the maximum 1518 bytes (octets) with either bad framing or an
invalid CRC.
♦ Late Collision
Counts collisions that occur at or after the 64
th
byte (octet) in the frame. This may
indicate that delays on your Ethernet are too long, and you have either exceeded the repeater count
or cable length specified in the Ethernet standard.
♦ MAC Received Error
Counts bit patterns with illegal encodings. This may indicate noise on the
line.
♦ Dropped Frames
Counts received packets which are dropped due to any of the following reasons:
lack of available receive buffers, port-disable, link-test-fail, spanning tree, or empty distribution list.
♦ Total Errors
The sum of the CRC Error, Oversize Frames, Fragments, Jabber, Late Collision, MAC
Received Error, and Dropped Frames counters.
♦ Collisions
The best estimate of the total number of collisions on this Ethernet segment.
Analysis
Figure 7-45. Port Packet Analysis window
Click
Reset Counter
to clear all the counters on the window above.