3Com 3C16685 User Manual - page 62
62
C
HAPTER
3: U
SING
THE
C
OMMAND
L
INE
I
NTERFACE
The screen shows the following statistics:
■
Octets
— This is the number of octets transmitted/received on
this segment. This calculation includes the MAC header and FCS,
but excludes preamble/Start-of-Frame Delimiter.
■
Frames
— This is the total number of frames since last reset.
Examining the statistic regularly can help you monitor network
traffic.
■
Broadcast Frames
— This is the total number of broadcast
frames seen on the segment. Broadcast frames are frames that
are addressed to all MAC addresses (that is, all devices) in a
segment. A high level of broadcast frames can adversely affect
network performance.
■
Errors per 10K Frames
This is the number of errors seen on the
segment per 10,000 frames, sampled every 60 seconds.
■
Frames per second
— This is the average number of frames
seen per second at the segment, sampled every 60 seconds.
■
Multicast Frames
— This is the total number of multicast
frames seen at the segment. A multicast frame is one that is
addressed to a group of MAC addresses (that is, several devices)
on the network. A high level of multicast frames can adversely
affect network performance.
■
FCS Alignment Errors
— The alignment errors count is the
number of frames that are not an integral number of octets in
length and do not pass the FCS check. Alignment errors may be
caused by a fault at the transmitting device. Check transceiver or
adapter cards of devices connected to this segment. If this does
not solve the problem, check cables and connections for damage.
■
Undersized Frames
— The total number of error packets
seen on this segment, which are smaller than the minimum size
defined for packets (defined by IEEE Ethernet standards).
Undersize packets may indicate externally generated noise
causing problems on the network. Check the cabling routing and
re-route any cabling which may be affected by external noise
sources.
■
Oversized Frames
— The total number of packets seen on
this segment that exceed the maximum length defined for
packets (1518 octets). If you see a high number of oversize
packets on your network segment, you need to isolate the source