Operation Manual

34 NetWare MultiProtocol Router for ISDN 3.1 Installation and ISDN Configuration Guide
set-up request and clear down the physical B channel. Thus, in any
case as long as the ISDN connection is not logically cleared by
another method than the Disconnect Timeout, the ISDN interface
remains reserved for the connection once set up over this interface.
For remote nodes, interface reservation can be achieved by setting
the parameter "Remote Node Usage" in the Expert Configuration for
Interface <Interface Name> to "Exclusive Interface Reservation".
This is the basic set-up of a classic WAN link over ISDN, disregard-
ing whether you route and/or bridge and disregarding whether you
use routing protocols, such as RIP/SAP, NLSP or OSPF, or configure
static routes/services for IPX, IP or AppleTalk. Setting up WANs this
way guarantees that the physical link is always available when
needed, because the ISDN interface reserves the B channels for the
configured destinations.
Dial-Around Scenarios Involve Dynamic ISDN Interface Use
For dial-around scenarios, ISDN interfaces are not dedicated, but
used dynamically for multiple destinations. In these scenarios, it is
not guaranteed that a physical B channel (or B channels) is (are)
always available for a connection, since it may already be in use for
another connection that has been configured to be set up over the
same ISDN interface.
♦♦ Initial call set-up
Such dial-around links are set up on demand, rarely manually by
using CALLMGR, for IPX further by using CICC (rarely manually
from a client, but in most cases with the help of batch routines), and,
most commonly with TCP/IP but also possibly for IPX and Apple-
Talk, by configuring static routes/services for set-up by a request
from the respective network protocol each time a packet is ad-
dressed for a remote destination.
♦♦ Physical clear-down
For control of all underlying physical ISDN connections over the B
channels, you configure the Inactivity Timeout for each destination
the same way you do it for classic WAN links.
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