AIS AI2524 Configure the Ignore Destination Time, Establish the Packet Acknowledgment Policy

Chapter 12: AI2524 X.25 Configuration Steps

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:

zSpecify the default maximum number of SVCs that can be open simultaneously to one host for each map.

x25 nvc count

zSpecify 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.

August 1997	Page 12-25
2524UM