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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
Ethernet Aggregation
Many enterprise customers use Ethernet technology for the “hub” site within a VPN network. “Spoke”
sites are generally connected to the service provider infrastructure with lower speed fixed circuits.
Customer connections are usually defined as 802.1Q virtual LAN (VLAN) logical interfaces under the
main Ethernet interface. The Cisco 10000 series router supports both Gigabit and Fast Ethernet
interfaces with many IP services, including QoS and ACLs.
Figure 1-14
shows an example of Ethernet architecture.
Figure 1-14
Ethernet Architecture
MPLS Provider Edge Applications
MPLS technology has allowed providers to target small to medium-sized businesses for outsourced VPN
services. The “build once, sell many” approach of the network design provides scalability and flexibility
with respect to VPN products and services. MPLS provider edge functions and associated features and
services are offered on the Cisco 10000 series router, spanning all interfaces and encapsulations from
low-speed broadband to traditional leased-line applications to high-speed Ethernet.
Figure 1-15
shows an example of MPLS architecture.
Figure 1-15
MPLS Architecture
IP
Ethernet
IP network
SONET/SDH
IP
Cisco 10000
series
Gigabit
Ethernet
Ethernet
119487
Business
customer
IP
IP network
Cisco 10000
series
119488
VPN-A
VPN-B
Customer
edge
Customer
edge
Provider
edge
MPLS Core
Cisco 10000
series
Cisco 10000
series
Provider edge
Office 1
(VPN-A)
Office 2
(VPN-B)
Office 3
(VPN-A)
Office 4
(VPN-B)
MPLS VPN
Access protocol
