User guide

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

New and Changed Information

RSVP over ATM allows you to conﬁgure an interface or subinterface to dynamically create SVCs

in response to RSVP reservation requests. To ensure deﬁned quality of service (QoS), these SVCs

are established having QoS proﬁles consistent with the mapped RSVP ﬂowspecs. To further support

QoS, this feature allows you to conﬁgure the IP Precedence and ToS values to be used for packets

that conform to or exceed QoS proﬁles. Moreover, it allows you to attach DWRED group deﬁnitions

to the (PA-A3 ATM port adapter) interface to support per-VC DWRED drop policy, which ensures

that if packets must be dropped, then best-effort packets are dropped ﬁrst and not those that conform

to the appropriate QoS determined by the RSVP’s token bucket.

Service Provider Features for Voice over IP

The 12.0(3)T Cisco voice service provider features include enhancements made to the functionality

and conﬁguration of both the gateway and the Voice over IP (VoIP) gatekeeper. The architecture of

these features provides the Quality of Service (QoS), stability, and functionality necessary for carrier

class, real-time IP communications services.

This document contains a basic description of the H.323 VoIP gateway in addition to features

required to implement the applications to run VoIP in a service provider environment. The features

address the service provider needs to offer security, billing, scaling, and reliability.

The Cisco VoIP gateway is a high performance H.323-compliant gateway optimized for VoIP

applications. Supporting up to two T1/E1 digital channels, it connects with existing telephones and

fax machines through the Public Switched Telephone Network (PSTN), key systems, and PBXs,

making the process of placing calls over the IP network transparent to users.

The gateway capability allows the Cisco VoIP gateway to function as an H.323 endpoint. Therefore,

the gateway provides admission control, address lookup and translation, and accounting services.

The gatekeeper manages H.323 endpoints in a consistent manner, allowing them to register with the

gatekeeper and to locate another gatekeeper. The gatekeeper provides logic variables for proxies or

gateways in a call path to provide connectivity with the Public Switched Telephone Network

(PSTN), to improve Quality Of Service (QoS), and to enforce security policies. Multiple gatekeepers

may be conﬁgured to communicate with one another, either by integrating their addressing into

Domain Naming System (DNS), or via Cisco I OS conﬁguration options.

SLIP-PPP Banner and Banner Tokens

The SLIP-PPP Banner section of this feature enables you to conﬁgure the banner that is displayed

when making a SLIP connection. This improves compatibility with non-Cisco SLIP dial-up

software.

The Banner Tokens section of this feature introduces the use of tokens to all existing banner

commands. Tokens allow you to display current information from the conﬁguration, such as the

router’s hostname, IP address, encapsulation type, and MTU size.

SNMP v3

Simple Network Management Protocol version 3 (SNMPv3) addresses issues related to the large

scale deployment of SNMP for conﬁguration, accounting and fault management. Currently SNMP

is predominantly used for monitoring and performance management. The primary goal of SNMPv3

is to deﬁne a secure version of the SNMP protocol. SNMPv3 also facilitates remote conﬁguration of

the SNMP entities which make remote administration of SNMP entities a much simpler task.

SNMPv3 builds on top of SNMPv1 and SNMPv2 to provide a secure environment for the

management of systems and networks.