CANOGA PERKINS 9145ELB NID Software Version 4.01 - Manual (Page 77)

Port Information 9145ELB NID Software User’s Manual
Layer 2 Statistics
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5.4.1 Layer 2 Counter Definitions
The following are definitions of the counters displayed on the Layer 2 Statistics screen (Figure 5-
12), the Layer 2 Error Statistics screen (Figure 5-13), and Layer 2 Frame Type Statistics screens
(Figure 5-14).
5.4.1.1 Layer 2 Statistics
These counters are shown in Figure 5-12.
Frames Sent The total number of frames sent from the interface since the last reset (Raw) or the
last counter reset (Current).
Frames Rcvd The total number of valid frames received on the interface since the last reset
(Raw) or the last counter reset (Current).
Bytes Sent The total number of bytes transmitted from the interface since the last reset (Raw) or
the last counter reset (Current).
Bytes Rcvd The total number of valid bytes received on the interface since the last reset (Raw)
or the last counter reset (Current).
Frames > 1518 The number of frames received on the interface that had a length of 1519 or
higher. The length of the frame is calculated from the first bit of the destination address to the last
bit of the CRC.
Frames > Limit The number of frames received on the interface that had a length that exceeded
the user-defined Frame Size.
Line Rate Utilization The percent utilization of the Ethernet segment on a scale of 0 to 100
percent.
5.4.1.2 Layer 2 Error Statistics Screen
These counters are shown in Figure 5-13
Frames Sent The total number of frames sent from the interface since the last reset (Raw) or
the last counter reset (Current).
Frames Rcvd The total number of valid frames received on the interface since the last reset
(Raw) or the last counter reset (Current).
Collisions The number of collisions that the interface encountered when attempting to transmit
a frame over a half duplex connection.
Late Collisions The number of collisions that the interface encountered later than 512 bit-times
into the frame when attempting to transmit a frame over a half duplex connection.
Alignment Errors The number of frames received on the interface that had a non-integral
number of octets and a bad CRC. The interface will discard the frame.
Undersize < 64 The number of frames received on the interface that were less than 64 bytes in
length (excluding preamble and start-of-frame delimiter, but including the CRC), and were
otherwise well formed. The interface will discard the frame. Undersized frames are also known
as runts.