
Communication Layers' Attributes
Appendix D
D-10
Transport-Layer Counters:
Description:
Open Connections
The number of connections open at the transport layer.
Current free transport buffers
This is a count of the number of buffers that are available for
use by the transport layer.
Lowest level of free transport buffer
This is the minimum value that the counter listed above has
reached.
The following table lists the Network–Layer attributes for the OSI
coprocessor.
Network-Layer Parameters:
Description:
Lifetime
An integer that specifies the maximum time that may elapse
before a transmitted NPDU is delivered to its destination.
Discard NPDU General Limit
A threshold level on the Discard NPDU General counter.
Discard NPDU Congestion Limit
A threshold level on the Discard NPDU Congestion counter.
Discard NPDU Address Limit
A threshold level on the Discard NPDU Address counter.
Discard NPDU Lifetime Exceeded Limit
A threshold level on the Discard NPDU Lifetime Exceeded
counter.
Discard NPDU Unsupported Option Limit
A threshold level on the Discard NPDU Unsupported Option
counter.
Discard NPDU Reassembly Limit
A threshold level on the Discard NPDU Reassembly counter.
Checksum
An integer that specifies the usage of the optional checksum in
a NPDU header. A value of 0 is interpreted as Checksum
disabled
A value of 1 is interpreted as Checksum
enabled.
Configuration Timer
This timer determines how often an End System Hello (ESH)
PDU is sent from this network entity. The units are in seconds.
Redirection Timer
This timer value is placed into a Redirect (RD) PDU as the hold
timer, to ensure that bad or unused routing information is not
stored forever (units are in seconds).
Network-Layer Counters:
Description:
Discard NPDU General
A count of the number of NPDU's discarded for ``general"
reasons. General reasons include an unspecified reason,
protocol procedure error, incorrect checksum, header syntax
error, incomplete NPDU received, and duplicate option
specified.
Discard NPDU Congestion
A count of the number of NPDU's discarded because of media
congestion.
Discard NPDU Address
A count of the number of NPDU's discarded because of an
unknown or inaccessible address.
Discard NPDU Lifetime Exceeded
A count of the number of NPDU's discarded because its
lifetime expired.
Discard NPDU Unsupported Option
A count of the number of NPDU's discarded because it is not
fully supported.
Discard NPDU Reassembly
A count of the number of NPDU's discarded because of some
reassembly problem.
Network-Layer Attributes
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