Chapter 10: Layer 3 Network Design; Vrf Lite; Vrf Lite Route Redistribution; Vrf Lite Capability And Functionality - Avaya 8800 Planning And Engineering, Network Design

Chapter 10: Layer 3 network design

This section describes some Layer 3 design considerations that you need to be aware of to properly
design an efficient and robust network.

VRF Lite

Release 7.0 supports the Virtual Router Forwarding (VRF) Lite feature, which supports many virtual
routers, each with its own routing domain. VRF Lite virtualizes the routing tables to form
independent routing domains, which eliminates the need for multiple physical routers.
To use VRF Lite, you must install the Premier Software License.
VRF Lite fully supports the High Availability feature. Dynamic tables built by VRF Lite are
synchronized. If failover occurs when HA is enabled, VRF Lite does not experience an interruption.
For more information about VRF Lite, see Avaya Ethernet Routing Switch 8800/8600 Configuration
— IP Routing, NN46205-523.

VRF Lite route redistribution

Using VRF Lite, the Avaya Ethernet Routing Switch 8800/8600 can function as many routers; each
Virtual Router and Forwarder (VRF) autonomous routing engine works independently. 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.

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.
June 2016 Planning and Engineering — Network Design
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