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Cisco WAN Manager User’s Guide
Version 10.5, Part Number 78-12945-01 Rev. D0, August 2003
AppendixA Internet Connectivity
Functional Description
ability of transferring data between the ATM SAR and the IP stack. This custom interface will be
assigned a unique IP address and will have the ability of creating and deleting IP host-routes that use the
interface.
The custom interface will support IP over ATM as described in RFC1483. It will also be an ATMARP
client as described by RFC1577. Figure A-3 shows the custom interface that for the remainder of this
chapter will be referred to as the IPATM interface.
The IPATM requires the following configuration:
• IP address for the custom interface (address must be in same IP subnet as router)
• ATM End Station Address (AESA) to be used for SVC call requests to router
• Routers configured as AESA for router to be used by IPATM to connect SVC to router
Figure A-3 IPATM Custom Interface for VxWorks
IP Router
The IPATM interface actually communicates to a router or a set of routers. The interface from IPATM to
the router is an SVC connection. The IPATM interface has configuration that specifies a well-known
AESA for the router. When the IPATM interface is configured and attached to VxWorks IP layer, it will
perform the following steps.
1. Register the IPATM AESA with the SVC Signalling API (SIGAPI) service.
2. Make a series of SVC call requests to the routers the interface knows about.
3. When a call is established, send an ATMARP request to the router to inform router of the IP address
of the IPATM interface.
The SIGAPI provides access to the PXM SAR for the purpose of terminating the SVC on the PXM, and
provides a connection establishment procedure for obtaining VC identifiers and procedures for SVC
termination.
Note Note that PNNI can be used for routing of call requests from the IPATM interface to IP routers. If PNNI
is not available, then static routes must be specified for IPATM to router communication.
39162
To/from ATM connection to router
Telnet
Client/server API (e.g. Sockets)
TCP UDP
IP
IPATM
interface
FTP SV+ TimeOfDay