Cisco 10000 - Manual (Page 42)

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Cisco 10000 Series Router Software Configuration Guide
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Chapter 1 Broadband Aggregation and Leased-Line Overview
Leased-Line Architecture Models
Leased-Line Architecture Models
This section shows leased-line models for the following architectures and applications:
• Channelized aggregation
• Frame Relay aggregation
• ATM aggregation
• Ethernet aggregation
• MPLS provider edge application
• Combined Broadband and Leased-Line applications
Channelized Aggregation
The Cisco 10000 series router allows the aggregation of low-speed, very-high-density leased-line
circuits by using channelized interfaces.
Figure 1-11 shows an example of channelized architecture.
Figure 1-11 Channelized Architecture
In a typical Cisco 10000 series router application, the provider usually situates the aggregator in a
centrally located POP and backhauls individual customer connections from central offices across the
SONET/SDH networks. Add-drop multiplexers at either end of the optical network that provide
aggregation of low-speed customer connections (T1/E1) and aggregation into higher-order optical
interfaces in the central POP. Numerous IP services are supported over channelized interfaces, including
IP QoS, ACLs, IP multicast, and security services.
Frame Relay Aggregation
Many service providers offer IP Internet access and VPN products over existing Frame Relay access
networks. Frame Relay packet-switched networks allow flexibility to allocate resources based on traffic
profiles. When aggregating Frame Relay circuits, the Cisco 10000 series router is usually located in a
central POP and connects to local switch nodes through copper or optical interfaces. Typically, these
connections are implemented with nonchannelized interfaces. Frame Relay data-link connection
identifiers (DLCIs) are terminated on the Cisco 10000 series router with customer IP traffic routed
through the core network. Frame Relay encapsulation is supported on many interfaces, including
channelized and nonchannelized modules. Numerous Frame Relay options and services are supported
on the platform, including traffic shaping and QoS.
TDM/SONET
IP
PPP or HDLC
IP network
SONET/SDH
IP
Cisco 10000
series
Channelized
interfaces T1/E1
119484
Business
customer