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| Title | Size | Download |
|---|---|---|
| 02-VRF | 22.22 KB |
VRF
Introduction
Virtual Routing and Forwarding (VRF) implements route isolation, data independence, and data security for VPNs.
A VRF has the following components:
· A separate Label Forwarding Information Base (LFIB).
· An IP routing table.
· Interfaces bound to the VRF.
· VRF administration information including a route distinguishers (RD).
An RD is added before a site ID to distinguish the sites that have the same site ID but reside in different VPNs. An RD and a site ID uniquely identify a VPN site.
An RD is a string of 3 to 21 characters in one of the following formats:
· 16-bit AS number:32-bit user-defined number. For example, 101:3.
· 32-bit IP address:16-bit user-defined number. For example, 192.168.122.15:1.
· 32-bit AS number:16-bit user-defined number, where the minimum value of the AS number is 65536. For example, 65536:1.
VRFs can be bound to the multiple instances of a multicast or routing protocol to implement service isolation. For example, if a device supports multiple OSPF instances, you can bind a VRF to each OSPF process, so that routes learned by an OSPF process are added into the routing table of the bound VRF.
