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Chapter 12: AI2524 X.25 Configuration Steps
August 1997 Page 12-25
2524UM
Increase the Number of Virtual Circuits Allowed
For X.25 datagram transport, you can establish up to eight SVCs to
one host for each map.
To increase the number of virtual circuits allowed, perform one or both
of these tasks in interface configuration mode:
z
Specify the default maximum number of SVCs that can be open
simultaneously to one host for each map.
x25 nvc
count
z
Specify the maximum number of SVCs allowed for a map.
x25 map
protocol address
[
protocol2
address2
[...[
protocol9 address9
]]]
x121-
address
nvc
count
Configure the Ignore Destination Time
Upon receiving a Clear Request for an outstanding datagram transport
Call Request, the X.25 encapsulation code immediately tries another
Call Request if it has more traffic to send. This action can overrun
some X.25 switches.
To define the number of minutes the Cisco IOS software will prevent
calls from going to a previously failed destination, type this command
in interface configuration mode. Incoming calls will still be accepted.
x25 hold-vc-timer
minutes
Establish the Packet Acknowledgment Policy
You can instruct the Cisco IOS software to send an acknowledgment
packet when it has received a threshold of data packets it has not ac-
knowledged, instead of waiting until its input window is full. A value
of 1 sends an acknowledgment for each data packet received if it can-
not be acknowledged in an outgoing data packet. This approach im-
proves line responsiveness at the expense of bandwidth. A value of 0
restores the default behavior of waiting until the input window is full.
To establish the acknowledgment threshold, type (in interface config-
uration mode):
x25 th
delay-count
The packet acknowledgment threshold also applies to encapsulation
PVCs.