OSI/AS Configuration and Management Manual

Performance Considerations
OSI/AS Configuration and Management Manual—424119-001
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Event Thresholds
value. If you set MAXREMIT too high, excessive unnecessary traffic may be generated
on the line if the line is bad.
Event Thresholds
The OSI/AS subsystem provides many threshold values that can be used for EMS event
generation. This includes thresholds for layers 3, 4, 5, and 6, plus ACSE. Most of these
thresholds act as gauges of error conditions arising from congestion, protocol errors, or
incompatibilities between peer-level entities.
The default value for every threshold is 0. However, during the initial installation and
configuration stages it is useful to have as many indicators of potential problems as
possible. Therefore, you may want to set these thresholds at fairly low values to allow
for early detection of the error conditions reported by the thresholds. Later, you can
change these values to suit your particular application, setting them high enough to
ensure they do not interfere with the normal functioning of the system, but low enough
to be of value in the timely detection of problems. (Remember also that some of the
thresholds relate to temporary situations that normally occur during the operation of a
system.)
Miscellaneous Attributes
There are a number of attributes that do not easily fall into the other categories. They
include some attributes associated with X25AM, ES-IS routing exchange protocol, and
OSI IP. Many of these are timeout values that may need to be varied according to the
time of day, traffic load, or other factors. These values can be set in OSI/AS, which then
passes the values to OSI/TS, except where noted. These attributes are as follows:
•
X25DISCONNECT-DELAY Attribute on this page
•
L3IMMEDIATERR Attribute on this page
•
ESISESCONFTIME Attribute on this page
•
ESISQUERYRETRY Attribute on this page
•
ESISQUERYTIME Attribute on page 6-12
•
IPLIFETIME Attribute on page 6-12
X25DISCONNECT-DELAY Attribute
The X25DISCONNECTDELAY attribute defines the amount of time that TSP waits
before issuing a network disconnect request on an idle X.25 network connection. If you
set the value too high, it can tie up a network connection unnecessarily. However, you
must set the value high enough to ensure that the connection isn't unnecessarily
disconnected (for example, when the connection isn't really idle, just slow).
L3IMMEDIATERR Attribute
The L3IMMEDIATERR attribute specifies that an RR (receive ready) packet is
transmitted each time a data packet is received. This parameter can add extra line and
processing overhead.