Design Reference

VRF Lite architecture examples
VRF Lite enables a router to act as many routers. This provides virtual traffic separation for each
user and provides security. For example, you can use VRF Lite to:
• Provide different departments within a company with site-to-site connectivity as well as Internet
access
• Provide centralized and shared access to data centers.
The following figure shows how VRF Lite can emulate VPNs.
Figure 14: VRF Lite example
The following figure shows how VRFs can interconnect through an external firewall.
Figure 15: Inter-VRF forwarding based on external firewall
Although customer data separation into Layer 3 virtual routing domains is usually a requirement,
sometimes customers must access a common network infrastructure. For example, they want to
Layer 3 network design
56 Network Design Reference for Avaya VSP 4000 Series December 2014
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