1-3
Cisco 10000 Series Router Software Configuration Guide
OL-2226-23
Chapter 1 Broadband Aggregation and Leased-Line Overview
Broadband Architecture Models
Figure 1-1 PTA Architectural Model
In the figure, an ATM network (with no routing capability) is between the clients and the
Cisco
10000 series router. Each client session arrives on a VC (multiple sessions and PCs can use this
single VC). The IP
traffic of the client is encapsulated in PPPoX. The Cisco 10000 series router
terminates the PPP
sessions and routes the client data packets toward their final destination, typically
onto the ISP or corporate network.
Note PPPoX refers to either PPPoA or PPPoE.
PTA to Virtual Routing and Forwarding Architecture
Figure 1-2 shows a PPP termination and aggregation (PTA) to virtual routing and forwarding (VRF)
model for PPPoA or PPPoE sessions.
Cisco 10000
ESR
PPPoX
sessions
PPPoE
sessions
OC-3/OC-12 ATM
Routed
subscribers
GigEthernet or
OC-12 POS IP
routed traffic
AAA servers
ISP/corporate
network
Client
Client
Client
Client
AT M
network
EMS/NMS
76099
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