Operation Manual

Configuring IPX 165
Configuring IPX
An on-demand call is a point-to-point connection between two IPX
routers that becomes active only when one router must send user
data to the router at the other end.
No routing or service information crosses an on-demand call. Instead,
remote routes and services are configured on the local router as static
routes and services. In this way, the connection can remain inactive
until user data needs to cross it. Workstations needing to reach
remote destinations send packets to their local IPX router advertising
the routes, assuming the packets can reach their destination. The local
router stores the packets and tries to establish a connection to the
remote router. After the local router completes the call and negotiates
on-demand service, it forwards the stored packets to the remote
router, which then forwards them to their destination.
Because each router is configured with the routes and services that
are available at the opposite end of the connection, there is no need to
send routing or services updates or periodic routing/service informa-
tion across the connection. Each router simply advertises the routes
and services locally as if they had just arrived over the connection.
NetWare workstations and servers on the local LAN remain unaware
that no active permanent connection exists. The locally configured
static routes contain all information necessary for a local system to
access any remote service.
To avoid activating potentially expensive connections, type 20 (NetBIOS)
packets are not forwarded over on-demand calls as NetWare serialization
packets.
For design considerations for ISDN-WANs, refer to Chapter 4, "Basic
Design of ISDN-WANs and Configuration Overview" in this Guide.
9
c h a p t e r
On-Demand IPX Calls with Static Routes and Services
Note
Ipx.pm6 27.05.97, 21:04165