Delivering Services At The
Edge
BY KAREN LIVOLI
The current climate of the service provider market has made
it clear that cutting edge subscriber services are key to building customer
loyalty and creating new revenue streams. With spending under a microscope,
carriers need immediate, economical methods of leveraging their
investments in core networks and delivering edge-based services that impact
the bottom line. Service providers today are coping with a painfully obvious
fact of business life: Basic connectivity services do not generate
sufficient revenue to ensure profitability, much less long-term growth, for
providers. That profitability and growth can be created, however, if service
providers can generate more revenue from their subscriber base, comprised of
residential subscribers, business subscribers, as well as other service
providers.
Additionally, the ability to build service packages that combine
bandwidth and quality of service (QoS) parameters with content and
applications, and make them available to subscribers on an as-desired,
pay-as-you-use basis (dynamic service selection) offers an opportunity for
service providers to build multiple new revenue streams and provide a
migration path to enhanced service subscriptions.
Power To The Edge
To provide these types of services to subscribers in an optimal manner,
service providers must pay careful attention to the types of products that
are deployed at the edge of their network infrastructure. The edge of a
service provider�s network is the part of the network that touches
customers and it is the place where these much sought-after,
revenue-generating services can be delivered most profitably. By leveraging
the power of their edge connections, service providers can offer these
services and realize increased service revenues as a result.
Service providers today are coping not only with traditional connectivity
offerings � leased line, Frame Relay, and ATM � but also with new
transport mechanisms such as cable, DSL, and wireless. In addition, advanced
technologies such as virtual private networks (VPNs) and QoS are changing
the types of services that can be deployed. Some of these services are being
offered today; others have yet to mature. But all advanced services require
increased functionality at the edge of the provider�s network. These
services, and a provider�s ability to deliver them, will be the key to the
future success of service providers.
Architect The Foundation
The services architecture is an overall services framework that combines
both IP network services as well as application services to adequately
deliver advanced IP services to the subscriber base. Although complementary,
IP network services are vastly different from application services.
IP network services are defined as services that are delivered or
enforced by the router network itself, while application services are
services that are enabled by the IP network services to deliver increased
value to the customer. IP network services provide the foundation that must
be in place in order for a service provider to offer advanced application
services. Application services can be hosted on a separate hardware platform
for scaling and performance.
If a provider confuses the two types of services, its ability to offer
new and creative application services will be impacted. This is because any
service offered and delivered by a service provider requires that the
network be able to support controlled network and service characteristics.
These characteristics are delivered through IP network services that enable
stateful awareness of the network via routing protocols like OSPF, BGP,
IS-IS, DVMRP, MBGP, and MPLS, as well as deterministic performance via
bandwidth control, rate limiting, QoS provisioning, queuing, marking, and
labeling. IP network services are fundamental to all application services.
No matter what services the provider wants to deliver today or 12 months
from now, IP network services form the foundation that enables that
connection between the customer and the content.
Application services are the services that differentiate one provider
from another. Service providers can deliver services that meet consumer
demand and those services rely on the underlying IP Network Services of the
network. As an example, applications such as interactive gaming or voice
services require strict network resources that can only be enforced by
network guarantees of QoS, bandwidth, and latency. Any breach in these
services will degrade the service and potentially diminish the value of the
service to the consumer.
Fortunately, recent performance improvements in infrastructure equipment
have enabled the deployment of new application services. These technological
advances are now enabling service providers to offer differentiated services
to disparate vertical groups of customers and to realize incremental revenue
from each of these groups.
These new revenue-generating opportunities can only be delivered at the
subscriber edge � the physical point in the network where subscribers and
service providers meet. The service provider�s network must be capable of
supporting the IP network services, which are a prerequisite to delivering
the application services discussed above as well as others yet to be
developed.
Many industry experts now consider the edge to be the critical area in
the network to activate, prioritize, secure, and monitor large volumes of
broadband packet-based traffic. To be prepared at the network edge, service
providers must continue to invest in infrastructure that enables data and
voice services. As they upgrade their edge networks, service providers will
be able to deploy, administer, and bill for the differentiated IP services
that will generate the revenue they must acquire in this period of
increased, perhaps unprecedented, competition.
The Importance Of Edge Functions
There are three primary functions that are mandatory at the network edge
today: Carrier class routing, subscriber management, and IP services/service
creation. Most service providers agree that it is ideal for these functions
to be supported within a single product for several reasons. An integrated
solution will always be the best choice in terms of network management,
simply because it is always easier to manage and maintain a solution that
uses a single management system. The obvious benefits of a single management
platform aside, it is important to understand the evolution of edge
requirements to make an informed decision on an edge platform.
To address the needs of the emerging IP services market and accommodate
the growth in broadband access, two types of adjunct solutions were
developed to try to fill service providers� requirements. Adjunct
solutions � functioning as either a subscriber management platform or an
IP services platform � were developed in an effort to fill a single
network requirement for service providers. In a real-life network
installation, the adjunct subscriber management or IP services product sits
in front of the first Internet router, requiring either one or two products
plus an Internet router to connect to the backbone network. This additional
equipment makes the adjunct solution expensive and difficult to manage.
In contrast, next-generation, integrated edge routers have the processing
power to handle full routing, subscriber management, and IP services
functions, all at wire-speed. These functions are reunited into a single
edge device, which eases deployment and management, while including all of
the legacy management functionality of the adjunct solution. Also, an
integrated solution has the ability to deliver multiple services from a
single platform, with private line aggregation support for T1/E1 through
OC-12 users as well as support for advanced IP services. For the service
provider, the integrated approach means that a single edge device can
support multiple applications to fit the needs of all subscribers at that
point of presence (POP).
Wire-speed Routing � All Tier-1 Internet service provider (ISP) routing
protocols must be supported with a highly scalable implementation that can
keep pace as the subscriber base increases. The routing support must be
designed to allow service providers to deploy the new equipment into
existing network architectures with full interoperability with legacy
routing products. Carrier-class edge routers must also support the Border
Gateway Protocol (BGP-4), with support for several hundred peers,
Intermediate System-to-Intermediate System (IS-IS), Open Shortest Path First
(OSPF), Multiprotocol Label Switching (MPLS), and Routing Information
Protocol (RIPv1/v2) routing protocols.
Subscriber Management � Carrier-class edge routers must also offer
subscriber management features that enable service providers and carriers to
provision, aggregate and manage new broadband (xDSL, cable, fixed, and
mobile wireless) subscriber services via a single, unified platform. Service
providers will need an edge router solution that can speed the deployment of
all types of broadband services and also provide a scalable solution for
managing subscribers.
IP Services � The ideal carrier-class edge router will also offer IP
service features including but not limited to:
- Multicast Protocols;
- Intelligent Bandwidth;
- IP Quality of Service;
- Dynamic Policy Management;
- Virtual Routers;
- Rate Limiting;
- MPLS; and
- VLANs.
These features enable service providers to quickly and easily deploy
next-generation IP services with the ability to support data, voice, and
video services, all with the appropriate service levels.
Finally, it is imperative that all these services are performed at wire
speed. Without wire-speed routing and packet classification it is impossible
for service providers to deploy next-generation IP services with any
assurance of quality levels.
Ensure The Edge
In order to offer these premium services, service providers need to
ensure that their networks have the ability to support the underlying IP
networks services that must be in place before application services are
launched. IP network services such as IP QoS, dynamic policy management,
MPLS, support for routing protocols, and others, provide the necessary
foundation for the service provider network to support application services
such as video services, interactive gaming, VPNs, and many other new
services. By leveraging this technology, service providers can offer new
services already in demand by customers, and realize increased revenues as a
result.
Karen Livoli is the director of product marketing for IP Routing at
Unisphere Networks. She can be reached at [email protected].
Unisphere Networks, Inc., is a leading provider of carrier-grade IP
networking solutions to enable data, voice and rich media services. For more
information, please visit the Web site at www.unispherenetworks.com.
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