Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 1025
Virtual Routing and Forwarding (VRF)
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59 Virtual Routing and Forwarding (VRF) e Virtual Routing and Forwarding (VRF) (VRF) is supported only on platform: VRF allows a physical router to partition itself into multiple Virtual Routers (VRs). The control and data plane are isolated in each VR so that traffic does NOT flow across VRs.Virtual Routing and Forwarding (VRF) allows multiple instances of a routing table to co-exist within the same router at the same time. VRF improves functionality by allowing network paths to be segmented without using multiple devices. Using VRF also increases network security and can eliminate the need for encryption and authentication due to traffic segmentation. Internet service providers (ISPs) often take advantage of VRF to create separate virtual private networks (VPNs) for customers; VRF is also referred to as VPN routing and forwarding. VRF is implemented in a network device by having a distinct Forwarding Information Base (FIB) per VRF instance. A network device has the ability to configure different virtual routers, so that each has its own FIB that is not accessible to any other virtual router instance on the same device. VRF acts like a logical router; while a physical router may include many routing tables, a VRF instance uses only a single routing table. VRF uses a forwarding table that designates the next hop for each data packet, a list of devices that may be called upon to forward the packet, and a set of rules and routing protocols that govern how the packet is forwarded. These VRF forwarding tables prevent traffic from being forwarded outside a specific VRF path and also keep out traffic that should remain outside the VRF path. VRF uses interfaces to distinguish routes for different VRF instances. Interfaces in a VRF can be either physical (Ethernet port or port channel) or logical (VLANs). Starting in release 8.4.1.0, you can configure identical or overlapping IP subnets on different interfaces if each interface belongs to a different VRF instance. Virtual Routing and Forwarding (VRF) | 1025
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