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523
ProSafe M4100 and M7100 Managed Switches
Packets Received
with MAC Errors
• 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
non-integral number of octets (Alignment Error). Note that this definition of jabber is
different than 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 20–150 ms.
• Fragments/Undersize Received - 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 from 64 through 1518 octets, inclusive, but had a
bad Frame Check Sequence (FCS) with a non-integral number of octets.
• Rx FCS Errors - The total number of packets received that had a length (excluding framing
bits, but including FCS octets) of from 64 through 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.
Received Packets
Not Forwarded
• Total Received Packets Not Forwarded - A count of valid frames received which were
discarded (in other words, filtered) by the forwarding process
• Local Traffic Frames - The total number of frames dropped in the forwarding process
because the destination address was located off of this port.
• 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.
• Multicast Tree Viable Discards - The number of frames discarded when a lookup in the
multicast tree for a VLAN occurs while that tree is being modified.
• Reserved Address Discards - The number of frames discarded that are destined to an
IEEE 802.1 reserved address and are not supported by the system.
• Broadcast Storm Recovery - The number of frames discarded that are destined for
FF:FF:FF:FF:FF:FF when Broadcast Storm Recovery is enabled.
• CFI Discards - The number of frames discarded that have CFI bit set and the addresses in
RIF are in non-canonical format.
• Upstream Threshold - The number of frames discarded due to lack of cell descriptors
available for that packet's priority level.
Term Definition