Cabletron Systems ESX-1380, Руководство по управлению

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Chapter 12: The MIB-2 Statistics Screen
12-2 ESX-1320/ESX-1380 Local Management Guide
In Nonucast
This field displays the number of non-unicast packets (multicast and
broadcast packets; packets destined for more than one address) received
by the interface.
In Discards
This field displays the total number of packets discarded by the interface
due to a lack of available resources.
In Errors
This field displays the total number of errors received on the interface.
The number displayed in the In Errors display field can be composed of
the following errors:
• Out Of Window (OOW) collisions – Collisions caused by a station
on the network violating Carrier Sense and transmitting at will, a
cable failure occurring during the transmission of a frame, or
network propagation delay greater than 51.2
µ
s.
• Cyclic Redundancy Check (CRC) errors – Errors in the 4-byte
CRC field of a frame which ensures that the data received by the
ESX is the same as the data transmitted by the originating device.
• Alignment Errors – Alignment errors are frames which are
misaligned. A misaligned frame is one which contains a
non-integral number of bytes.
• Runt Packets – Runt packets are packets smaller than the
minimum Ethernet frame size of 64 bytes, not including preamble.
• Giant Packets – Giant packets are those whose size exceeds the
maximum Ethernet frame size of 1,518 bytes, not including
preamble.
NOTE
For interface 13, the BRIM port, the In Discards field displays
the number of times the ESX had to discard packets - any
number of packets - received on interface 13.
NOTE
A complete breakdown of In Errors may be obtained from the
ESX RMON MIB. Refer to your remote management package
documentation for instructions on how to obtain this
breakdown.