User Manual

Monitoring the System
375
M4100 Series Managed Switch
Packets Received > 1518
Octets
The total number of packets received that were longer than 1518 octets
(excluding framing bits, but including FCS octets) and were otherwise well
formed.
Total Packets Received
Without Errors
The total number of packets received that were without errors.
Unicast Packets Received The number of subnetwork-unicast packets delivered to a higher-layer
protocol.
Multicast Packets Received The total number of good packets received that were directed to a multicast
address. This number does not include packets directed to the broadcast
address.
Broadcast Packets Received The total number of good packets received that were directed to the
broadcast address. Note that this does not include multicast packets.
Total Packets Received with
MAC Errors
The total number of inbound packets that contained errors preventing them
from being deliverable to a higher-layer protocol.
Jabbers Received 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 nonintegral number of octets (Alignment Error). Note
that this definition of jabber is different from the definition in IEEE-802.3
section 8.2.1.5 (10BASE5) and section 10.3.1.4 (10BASE2). 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 Received The total number of packets received that were less than 64 octets in length
with ERROR CRC (excluding framing bits but including FCS octets).
Undersize Received The total number of packets received that were less than 64 octets in length
with GOOD CRC (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 nonintegral number of octets.
Rx 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.
Total Received Packets Not
Forwarded
A count of valid frames received which were discarded (for example filtered)
by the forwarding process.
802.3x Pause Frames
Received
A count of MAC control frames received on this interface with an opcode
indicating the PAUSE operation. This counter does not increment when the
interface is operating in half-duplex mode.
Unacceptable Frame Type The number of frames discarded from this port due to being an
unacceptable frame type.
Table 100. Port Detailed Statistics screen fields (continued)
Field Description