Vrf Lite Capability And Functionality; Vrf Lite Architecture Examples - Avaya 8800 Planning And Engineering

Layer 3 network design
Normally, no route leak occurs between different VRFs. Sometimes users may have to
redistribute OSPF or RIP routes from one VRF to another. The route redistribution option
facilitates the redistribution or routes.
If you enable route redistribution between two VRFs, ensure that the IP addresses do not
overlap. The software does not enforce this requirement.
This feature is available in R mode. This feature operates on R and RS modules only.

VRF Lite capability and functionality

On any VRF instance, VRF Lite supports the following protocols: IP, Internet Control Message
Protocol (ICMP), Address Resolution Protocol (ARP), Static routes, Default routes, Routing
Information Protocol (RIP), Open Shortest Path First (OSPF), Route Policies (RPS), Virtual
Router Redundancy Protocol (VRRP), and the Dynamic Host Configuration Protocol/
BootStrap Protocol relay agent.
Using VRF Lite, the switch performs the following:
• partitions traffic and data and represents an independent router in the network
• provides virtual routers that are transparent to end-users
• supports overlapping IP address spaces in separate VRFs
• supports addresses that are not restricted to the assigned address space given by host
Internet Service Providers (ISP).
• supports SMLT/RSMLT
• supports Border Gateway Protocol
IPv6 is supported on VRF 0 only.

VRF Lite architecture examples

VRF Lite enables a router to act as many routers. This provides virtual traffic separation per
user and provides security. For example, you can use VRF Lite to do the following:
• provide different departments within a company with site-to-site connectivity as well as
internet access
• extend WAN VPNs into campus LANs without interconnecting VPNs
• provide centralized and shared access to data centers
The following figure shows how VRF Lite can be used to emulate IP VPNs.
116 Planning and Engineering — Network Design November 2010