User guide

2-9
Cisco WLAN Controller Web Interface User Guide
OL-7416-04
Chapter 2 Monitor Menu Bar Selection
Ports Statistics
Time Since Counters Last Cleared: The elapsed time, in days, hours, minutes, and seconds since the
statistics for this port were last cleared.
Click Clear Counters to set all summary and controller detailed statistics counters to zero; also resets
the “Time Since Counters Last Cleared” field.
Table 2-6 Protocol Statistics
Parameter Received Description Transmitted Description
BPDUs The count of Bridge Protocol Data Units
(BPDUs) received in the spanning tree
layer.
The count of Bridge Protocol Data
Units (BPDUs) transmitted from the
spanning tree layer.
802.3x Pause Frames
Received
A count of Media Access Control
(MAC) frames received on this interface
with an opcode indicating a PAUSE.
This counter does not increment when
the interface operates in half-duplex
mode.
N/A.
Table 2-7 Received Packets with MAC Errors
Parameter Description
Total The total number of inbound packets that contained errors preventing them
from being deliverable to a higher-layer protocol.
Jabbers The total number of packets received that were longer than 1518 octets
(excluding framing bits, but including FCS octets), and had either a bad Frame
Check Sequence (FCS) with an integral number of octets (FCS Error) or a bad
FCS with a non-integral number of octets (Alignment Error). Note that this
definition of jabber differs from the definition in IEEE-802.3 section 8.2.1.5
(10Base-5) and section 10.3.1.4 (10Base-2). These documents define jabber as
the condition where any packet exceeds 20 ms. The allowed range to detect
jabber is between 20 ms and 150 ms.
Fragments/Undersiz
e
The total number of packets received that were less than 64 octets in length
(excluding framing bits but including FCS octets).
Alignment Errors The total number of packets received that had a length (excluding framing bits,
but including FCS octets) of between 64 and 1518 octets, inclusive, but had a
bad Frame Check Sequence (FCS) with a non-integral number of octets.
FCS Errors The total number of packets received that had a length (excluding framing bits,
but including FCS octets) of between 64 and 1518 octets, inclusive, but had a
bad Frame Check Sequence (FCS) with an integral number of octets.
Overruns The total number of frames discarded as this port was overloaded with
incoming packets, and could not keep up with the inflow.