Cisco Systems 10000 manual Remote Access to Mpls

Figure 4

L2TP Tunneled Architecture

RADIUS/AAARADIUS/AAA

		Cisco
Subscriber	ATM	10000	IP Network
		Series
	DSLAM

LAC	LNS
IP	IP/PPP
PPPoA or PPPoEoA	L2TP
ATM

The Cisco 10000 Series operates as a highly scalable LAC with a comprehensive set of PPP, AAA/RADIUS, and L2TP attributes. In many cases, an ISP will contract the service provider to dictate the service rate for the subscriber. This is usually implemented by ATM traffic shaping capabilities on the Cisco 10000 Series. A single LAC can support subscriber sessions for many remote ISPs, and it is common to provision a unique L2TP tunnel per destination ISP.

Remote Access to MPLS

Remote Access to MPLS (RA-MPLS) offers service providers an alternative to L2TP for the provisioning of wholesale services. Instead of building unique L2TP tunnels per ISP, a unique VPN per ISP is provisioned over an MPLS core (Figure 5). Layer 2 access protocols are terminated at the service provider’s edge and placed into the appropriate VPN. Subscriber traffic is routed through the VPN to the destination ISP’s network, and then onto the Internet.

Figure 5

RA-MPLS

		RADIUS/AAA		RADIUS/AAA
		Cisco
Subscriber	ATM	10000	IP Network
		Series
	DSLAM		P	P
			P	P
		PE		PE
	IP			IP
	RFC 1483/RBE or PPPoX		MPLS VPN
	ATM

The Cisco 10000 Series operates as a highly flexible provider edge MPLS device, supporting the widest range of Layer 2 encapsulations. It offers an array of per-VPN services, including Hot Standby Router Protocol (HSRP), AAA/ RADIUS, and DHCP.

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