AIS Router AI2524 - Manual (Page 282)

AI2524 Router Card User’s Manual
Page 12-24 August 1997
2524UM
z X.25 payload compression must be applied carefully.
Each compressed virtual circuit requires significant memory re-
sources (for a dictionary of learned data patterns) and computation
resources (every data packet received is decompressed and every
data packet sent is compressed). Excessive use of compression can
cause unacceptable overall performance.
z X.25 compression must be explicitly configured for map com-
mand.
A received call that specifies compression will be rejected if the
corresponding host map does not specify the compress option. An
incoming call that does not specify compression can, however, be
accepted by a map that specifies compression.
In interface configuration mode, enable payload compression over
X.25:
x25 map protocol address [ protocol2
address2 [...[ protocol9 address9 ]]] x121-
address compress
This command specifies that X.25 compression is to be used between
the two hosts. Because each virtual circuit established for compressed
traffic uses significant amounts of memory, compression should be
used with careful consideration of its impact on performance.
The compress option may be specified for an encapsulation PVC.
Configure the Encapsulation Virtual Circuit Idle Time
The Cisco IOS software can clear a datagram transport SVC after a set
period of inactivity. Routed SVCs are not timed for inactivity.
In interface configuration mode, set the time:
1. Set an idle time for clearing encapsulation.
x25 idle minutes
2. Specify an idle time for clearing a map's SVCs.
x25 map protocol address [ protocol2
address2 [...[ protocol9 address9 ]]] x121-
address idle minutes