Specifications

Overview of Dial Interfaces, Controllers, and Lines
Logical Constructs
DC-5
Cisco IOS Dial Technologies Configuration Guide
Specifically, you configure asynchronous interfaces to support PPP connections. An asynchronous
interface on an access server or router can be configured to support the following functions:
• Network protocol support such as IP, Internet Protocol Exchange (IPX), or AppleTalk
• Encapsulation support (such as PPP)
• IP client addressing options (default or dynamic)
• IPX network addressing options
• PPP authentication
• ISDN BRI and PRI configuration
For additional information about configuring asynchronous interfaces, see the chapter “Configuring
Asynchronous Lines and Interfaces.”
Group Asynchronous Interfaces
A group asynchronous interface is a parent interface that stores core protocol characteristics and projects
them to a specified range of asynchronous interfaces. Asynchronous interfaces clone protocol
information from group asynchronous interfaces. No data packets arrive in a group asynchronous
interface. By setting up a group asynchronous interface, you also eliminate the need to repeatedly
configure identical configuration information across several asynchronous interfaces.
See the “Overview of Modem Interfaces” chapter for more information about group asynchronous
interfaces.
Virtual Template Interfaces
A virtual template interface stores protocol configuration information for virtual access interfaces and
protocol translation sessions. (See Figure 4.)
Figure 4 Logical Construct for a Virtual Template Interface
Temporary
virtual access
interface
Multilink
session
event
VPDN
session event
Protocol
translation
event
S6490
Virtual template interface
Stores and projects
core protocol
configuration
information