Novell NETWARE 6, Руководство пользователя

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Understanding
25
Internetwork Packet Exchange
103-000176-001
August 29, 2001
Novell Confidential
Manual 99a
38
July 17, 2001
Call Types
Associated with each WAN call destination is the call type , which
characterizes the behavior of the call after it is established. Calls can be
permanent or on-demand .
For more information about call types, refer to:
Š “Permanent Calls” on page 25
Š “On-Demand Calls” on page 25
Š “Routed On-Demand Calls” on page 26
Permanent Calls
A permanent call is a connection that remains active between the local router
and the remote router identified by the call destination. A permanent call can
be established automatically from configured protocol-to-board bindings, or
manually from CALLMGR. The call remains active until IPX is unbound
from the interface, or until the connection is disconnected manually from
CALLMGR. If a permanent call fails, IPXRTR tries to reestablish the
connection.
IPX routing and service information crosses permanent calls as required by
the operative routing/service protocol, which can be RIP/SAP or NLSP. If you
do not want routing and service traffic to cross a permanent-call link, the
routing software enables you to configure
static routes and services on each
router. This is typically how IPX routers are made aware of remote routes and
services over links that use on-demand calls.
For information about static routes and services, refer to “Static Routes and
Services” on page 28 .
For more information about permanent calls, refer to “Understanding” in the
routing documentation for NetWare/Link PPP.
On-Demand Calls
An on-demand call is a dedicated, point-to-point connection between two
routers that becomes active only when one router must send user data to the
other. Because the on-demand call relies on configured static routes and
services, no routing or service information crosses the link while the call is
active.