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28 Release Notes for Cisco 2500 Series for Cisco IOS Release 12.0 T

Important Notes

IETF Compliant PPP over ATM Scalability

Point-to-Point Protocol (PPP) over Asynchronous Transfer Mode (ATM) is now available on an

ATM CES port adapter in a Cisco 7200-series router.

In previous releases of PPP over ATM, you conﬁgured permanent virtual circuits (PVCs) for PPP

over ATM on point-to-point subinterfaces. In this release, each PPP over ATM connection no longer

requires two interfaces, a virtual access interface and ATM subinterface. Instead, you can conﬁgure

multiple PVCs for PPP over ATM on multipoint subinterfaces, thereby providing a signiﬁcant

increase in the number of PPP over ATM sessions per router. Also in this release, PPP over ATM is

enhanced to support virtual circuit (VC) multiplexed encapsulation and complies with the Internet

Engineering Task Force (IETF) draft on multiplexed encapsulation titled PPP over AAL5. The

previous version of PPP over ATM supported only the Frame Forwarding data encapsulation

(aal5ciscoppp).

Note The IETF PPP over ATM feature does not currently support LLC encapsulated PPP over

ATM Adaptation Layer 5 (AAL5).

This release of the PPP over ATM feature provides support for IETF-compliant PPP over ATM and

signiﬁcantly increases the maximum number of PPP over ATM sessions running on a router. The

maximum number of PPP over ATM sessions supported on a platform depends on available system

resources such as memory and CPU speed.

Data Compression Advanced Interface Module

This document describes how to conﬁgure, verify, and troubleshoot the Data Compression features

of the Advanced Interface Module (AIM) on Cisco 2600 Series Routers. The Data Compression

AIM provides hardware-based compression and decompression of packet data transmitted and

received on the serial network interfaces of Cisco 2600 Series Routers without occupying the Port

Module Slot, that might otherwise be used for additional customer network ports. Supported are the

industry standard LZS and MPPC compression algorithms. The Data Compression AIM requires

Cisco IOS Release 12.0(1)T, or later 12.0 T releases.

ATM PVC Trap Support

The ATM PVC Trap Support feature provides Simple Network Management Protocol (SNMP)

notiﬁcation for permanent virtual circuit (PVC) failures, and it provides SNMP access to PVC status

tables.

Normally, a management station is not notiﬁed when an Asynchronous Transfer Mode (ATM) PVC

goes down. The ATM PVC Trap Support feature enables an agent to send the required PVC traps for

this notiﬁcation. It also provides support for these PVC status tables: atmCurrentlyFailingPVclTable

and atmInterfaceExtTable.

Important Notes

The following sections contain important notes about Cisco IOS Release 12.0 that can apply to the

Cisco 2500 series.

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Cisco 2503 User's Guide Page 28