8-14
Configuring Demand Routing for Primary ISDN Modules
ProCurve Secure Router ISDN Modules
Table 8-2. Differences Between Primary and Backup ISDN Modules
Note Demand routing is supported with the J.04.01 release of the Secure Router
operating system (OS).
Both primary and backup ISDN modules use PPP as the Data Link Layer
protocol for the WAN connection and support PPP authentication. This
chapter describes how to configure and manage ISDN connections
established through the primary ISDN modules. For more information about
backup modules, see the
Advanced Management and Configuration Guide
,
Chapter 3: Configuring Backup WAN Connections.
ISDN Module Hardware
Requirements
Applications Activation Method Increasing Bandwidth
primary uses one narrow
slot on the
ProCurve Secure
Router
primary or backup WAN
connection between two
offices that exchange
data periodically and
need a low-cost WAN
solution
established only when
traffic that you identify as
“interesting” needs to be
transmitted across the
connection
supports Multilink PPP
(MLPPP), which can
aggregate multiple B
channels across different
ISDN lines
backup does not use a
narrow slot;
installed on top of
any narrow
module, enabling
the use of the
backup port on the
module
• backup for two
locations that must
maintain a persistent
WAN connection
• backup for two
locations that require
high availability
two activation methods:
• persistent backup
connection, which is
established
immediately when the
primary connection
fails and maintained
until the primary
connection is re-
established
• demand routing
connection, which is
established when two
conditions are met:
– primary WAN
connection fails
– traffic you identify
as “interesting”
needs to be
transmitted across
the connection
• supports channel
bonding with another
ProCurve Secure Router
when you configure a
persistent backup
connection
• does not support
channel bonding with
demand routing
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