| Measurement |
Description |
Measurement
Unit |
Interpretation |
| Reliability_value |
Provides the
level of reliability for the interface |
Number
|
This value
represents the percentage of total transmissions and receptions that
resulted in errors, expressed as a fraction of 255. A value of 255
indicates a very reliable link. |
| Reliability_pct |
Indicates the
reliability of an interface as a percentage |
Percent
|
Reliability_pct
is computed as (Reliability_value)*100/255. A drop in the value of
this measure indicates an error-prone interface. |
| Delay |
The amount of
delay of an interface |
Secs
|
This value is
measured and reported by the Cisco IOS. Any increase in this value is
usually attributable to an increase in traffic over an interface. |
| Load_factor |
The degree of
loading of an interface, reported as a percent. |
Percent
|
A value of 100%
indicates a saturated interface. Consider increasing the
speed/capacity of the interface in this case. |
| Data_recvd_rate |
The rate of data
received by the router over an interface |
Mbps
|
This value is an
indicator of the instantaneous traffic received
over an interface. |
| Data_xmit_rate |
The rate of data
transmitted by the router over an interface |
Mbps
|
This value is an
indicator of the instantaneous traffic transmitted over an interface. |
| In_queue_drops |
Number of packets
dropped during reception over the interface during the last
measurement period |
Number
|
This value counts
the number of packets that were not received (i.e., thrown away)
because of lack of a system resource (e.g., a buffer). Packets can be
dropped even if the number of packets queued on the input side is
equal to the input queue limit. Ideally, there should be no queue
drops. An increase in queue drops is an indicator that the router may
not be able to service the traffic received by it. |
| Out_queue_drops |
Number of packets
dropped during transmission over the interface during the last
measurement period |
Number
|
This value counts
the number of packets that were not transmitted (i.e., thrown away)
because of various reasons. For example, packets can be dropped
because the output queue occupancy has reached the pre-specified queue
limit. Packet drops can also occur because of insufficient buffers -
e.g., not having a hardware transmission buffer when a packet is
fast-switched from one interface to another. Repeated queue drops can
indicate congestion at the router. |
| Num_resets |
Number of times
an interface was reset in the last measurement period |
Number
|
This value counts
the number of times an interface internally reset. Repeated resets may
be indicative of hardware problems in the router. |
| Num_restarts |
Number of times
an interface needed to be completely restarted in the last measurement
period |
Number
|
This value should
be close to zero in most cases. |
| Num_crc_errors |
Number of input
packets in the last measurement period that had cyclic redundancy
checksum errors |
Number
|
This value which
is mainly relevant for serial lines is one of the factors that affects
the reliability of the line. |
| Num_aborts |
Number of packet
receptions in the last measurement period that were aborted due to
errors |
Number
|
|
| Num_collisions |
Number of
collisions that occurred over an interface during the last measurement
period |
Number
|
This value which
is mainly relevant for LAN interfaces is one of the factors affecting
the reliability of the line. |
| Slow_Packets_In |
The rate at which packets routed with slow switching were received |
Packets/sec
|
|
| Slow_Packets_Out |
The rate at which packets routed with slow switching were transmitted |
Packets/sec |
|
| Link_protocol |
Indicates the current status of the link protocol. |
|
The values that this measure can report and their corresponding numeric values have been outlined in the table below:
| Measure Value |
Numeric Value |
| Up |
1 |
| Down |
0 |
Note:
By default, this measure reports one of the States listed in the table above to indicate the status of the link protocol. The graph of this measure however, represents the same using the numeric equivalents - 0 or 1.
|