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Cisco ONS 15454 Installation and Operations Guide
November 2001
Chapter9 Ethernet Operation
Remote Monitoring Specification Alarm Thresholds
One of the ONS 15454’s RMON MIBs is the Alarm group. The alarm group consists of th e alarmTable.
An NMS uses the alarmTable to find the alarm-causing thresholds for network performance. The
thresholds apply to the current 15-minute interval and the current 24-hour interval. RMON monitors
several variables, such as Ethernet collisions, and triggers an event when the variable crosses a threshold
during that time interval. For example, if a threshold is set at 1000 collisions and 1001 collisions occur
during the 15-minute interval, an event triggers. CTC allows you to provision these thresho lds for
Ethernet statistics.
Note You can find performance monitoring specifications for all other cards in the Cisco ONS 15 454
Troubleshooting and Maintenance Guide.
Note The following tables define the variables you can provision in CTC. For example, to set the collision
threshold, choose etherStatsCollisions from the Variable menu.
Table9-10 Ethernet Threshold Variables (MIBs)
Variable Definition
iflnOctets Total number of octets received on the interface, including
framing octets
iflnUcastPkts Total number of unicast packets delivered to an appropriate
protocol
iflnErrors Number of inbound packets discarded because they contain
errors
ifOutOctets Total number of transmitted octets, including framing packets
ifOutUcastPkts Total number of unicast packets requested to transmit to a single
address
dot3statsAlignmentErrors Number of frames with an alignment error, i.e., the length is not
an integral number of octets and the frame cannot pass the Frame
Check Sequence (FCS) test
dot3StatsFCSErrors Number of frames with framecheck errors, i.e., there is an
integral number of octets, but an incorrect Frame Check
Sequence (FCS)
dot3StatsSingleCollisionFrames Number of successfully transmitted frames that had exactly one
collision
dot3StatsMutlipleCollisionFrame Number of successfully transmitted frames that had multiple
collisions
dot3StatsDeferredTransmissions Number of times the first transmission was delayed because the
medium was busy
dot3StatsLateCollision Number of times that a collision was detected later than 64 octets
into the transmission (also added into collision count)
dot3StatsExcessiveCollision Number of frames where transmissions failed because of
excessive collisions
etherStatsJabbers Total number of Octets of data (including bad packets) received
on the network