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MPLS/VPN Architecture Overview

Sample Chapter is provided courtesy of Cisco Press.
Date: Aug 2, 2002.

Chapter Information

Chapter Description

MPLS/VPN concepts are introduced in this mock case study of service provider SuperCom and its two key customers. Learn how VPNs based on MPLS combine the benefits of the overlay VPN model with the benefits of the peer-to-peer VPN model.

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Route Targets

A careful reader might start asking an interesting question: If there is no one-to-one mapping between VPN and VRF, how does the router know which routes need to be inserted into which VRF? This dilemma is solved by the introduction of another concept in the MPLS/VPN architecture: the route target. Every VPN route is tagged with one or more route targets when it is exported from a VRF (to be offered to other VRFs). You can also associate a set of route targets with a VRF, and all routes tagged with at least one of those route targets will be inserted into the VRF.

NOTE

The route target is the closest approximation to a VPN identifier in the MPLS/VPN architecture. In most VPN topologies, you can equate them, but in other topologies (usually a central services topology), a single VPN might need more than one route target for successful implementation.

The route target is a 64-bit quantity, the format of which is explained in the next chapter. For simplicity reasons, we will use names for route targets in this chapter.

The SuperCom network contains three VPNs and thus requires three route targets. The association between route targets and VRFs in the SuperCom network is outlined in Table 9-4.

Table 9-4 Correspondence Between VRFs and Route Targets in SuperCom Network

PE Router	VRF	Sites in the VRF	Route Target Attached to Exported Routes	Import Route Targets
San Jose	FastFood_ Central	FastFood SanJose site	FastFood, VoIP	FastFood, VoIP
	FastFood	FastFood Santa Clara site FastFood Redwood site	FastFood	FastFood
	EuroBank	EuroBank San Francisco site	EuroBank	EuroBank
	VoIP	San Jose VoIP gateway	VoIP	VoIP
Paris	FastFood	FastFood Lyon site	FastFood	FastFood
	EuroBank_ Central	EuroBank Paris site	EuroBank, VoIP	EuroBank, VoIP
	EuroBank	EuroBank Chartres site EuroBank Nantes site	EuroBank	EuroBank
	VoIP	Paris VoIP gateway	VoIP	VoIP

NOTE

Based on Table 9-4, you might assume that the route targets attached to routes exported from a VRF always match the set of import route targets of a VRF. Although that's certainly true in simpler VPN topologies, there are widespread VPN topologies (for example, central services VPN) in which this assumption is not true.

5. Propagation of VPN Routing Information in the Provider Network | Next Section Previous Section

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