Context:
polling device, understands X.25, talks over IP
polled device, speaks X25, designed to work with modems over serial port
Cisco 2600 series router, used to encapsulate X.25 for IP transmission
Cisco fa0/0 receives calls on specific port from polling device, translates these to pvc on S1/0 connected to polled device.
This is set up with: x25 pvc 1 rbp local port 10001 recordsize 1024 packetsize 512 512 windowsize 3 3
Scenario:
Polled device or router takes serial connection down and up.
This causes the router to send a restart packet (FB) over the pvc. The polled device responds with restart confirm (FF) packet.
Polling device places call to router on port 10001, router routes to polled device, data is successfully polled.
When IP connection is dropped the polled device treats the call like a modem and considers the call disconnected.
It no longer responds to router.
Router sends reset request (1F) packet.
Polled device ignores packet as it considers the link to be in an uninitialized state.
Shutting the serial link down and bringing it back up, or doing an x25 clear causes the exchange of restart packets (FB,FF) and polling is again successful.
However this requires manual intervebntion, where we want an automated process.
How can we cause the router to send the restart packet either at the end odf a successful poll, or the beginning of the next one, or can we?
The polled device has very little configuration.
Thanks!
