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112 Chapter 6 Configur ing RMON using Device Manager
Field Description
Fragments The total number of packets received that were less than
64 octets in length (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). It is normal for
etherStatsFragments to increment because it counts both runts
(which are normal occurrences due to collisions) and noise hits.
Collisions The best estimate of the total number of collisions on this
Ethernet segment.
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). Jabber is
defined as the condition where any packet exceeds 20 ms. The
allowed range to detect jabber is between 20 ms and 150 ms.
1..64
The total number of packets (including bad packets) received
that were between 1 and 64 octets in length (excluding framing
bits but including FCS octets).
65..127
The total number of packets (including bad packets) received
that were between 65 and 127 octets in length (excluding
framing bits but including FCS octets).
128..255
The total number of packets (including bad packets) received
that were between 128 and 255 octets in length (excluding
framing bits but including FCS octets).
256..511
The total number of packets (including bad packets) received
that were between 256 and 511 octets in length (excluding
framing bits but including FCS octets).
511..1023
The total number of packets (including bad packets) received
that were between 511 and 1023 octets in length (excluding
framing bits but including FCS octets).
1024..1518
The total number of packets (including bad packets) received
that were between 1024 and 1518 octets in length (excluding
framing bits but including FCS octets).
Nortel Ethernet Switch 460/470
Configuration — System Monitoring
NN47210-503 01.01 Standard
3.7 22 February 2007
Copyright © 2005-2007, Nortel Networks Nortel Networks Confidential
.