IPX

IPX has been enhanced to support NetWare Link/Frame Relay PVCs. When NetWare Link/Frame Relay registers with the WAN Call Support Layer (CSL), IPX automatically posts a listen for call requests with the CSL. The NetWare Link/Frame Relay driver notes this and generates incoming call indications on all configured PVCs.

Because NetWare Link/Frame Relay uses protocol ID matching as its default, all incoming calls are accepted, and these links are treated as permanent links. In attempting to establish the IPX-level link, NetWare Link/Frame Relay exchanges IPX Wide Area Network (IPXWAN^TM) packets. Novell's IPXWAN determines what is at the remote side of the connection. Each PVC must have a unique network number for negotiation on each PVC.

IPX does not always voluntarily disconnect a link to NetWare Link/Frame Relay, except when configuration errors occur, or if a user manually issues a disconnect through the Call Manager utility (CALLMGR). In each case, to try to reestablish the link, NetWare Link/Frame Relay generates incoming calls later. If a Frame Relay link becomes inoperative, NetWare Link/Frame Relay must generate disconnects to the protocol and reestablish the link when it is working again. When the link is reestablished, NetWare Link/Frame Relay generates incoming calls again.