It's good! We have ip reachability to PE from the CE routers. Success rate is 100 percent (5/5), round-trip min/avg/max = 8/60/136 ms Success rate is 100 percent (5/5), round-trip min/avg/max = 8/48/156 ms Success rate is 100 percent (5/5), round-trip min/avg/max = 8/35/80 ms Sending 5, 100-byte ICMP Echos to 1.1.1.1, timeout is 2 seconds: Let's configure the other routers Blue, Red and Yellow with 1.1.1.2/30 on their FastEthernet0/0 interfaces. The command "ip vrf forwarding " will add the vrf to a specific interface. Normally without VRF, the router will give a warning message that overlapping ip addresses are not allowed. If you notice above all interfaces have the same ip address which is 1.1.1.1. PE(config-subif)#ip vrf forwarding yellow Now we have created VRF's, lets configure interfaces and apply the VRF's to the interfaces. What really matters is the "route target" value because this is what you will import or export. The VRF names and rd values are actually locally significant which means that it doesn't matter what name you create. Now let's configure RD's on the PE router.īasically the "rd" command is in the format ASN:nn or IP-address:nn. We will name the VRF's Blue, Red and Yellow. We have 3 customers in the figure connected to a Provider Edge router. Through the network setup below, we will see how to configure VRF and check if its really possible for duplicate ip addresses. Some enterprises use VRF to seggrate their services like VOIP, wireless, geographical location and other varieties. This means that overlapping use of IP addresses from different customers is possible. The most interesting feature of this is that, VRF allows creation of multiple routing tables within a single router. Virtual Routing and Forwarding is commonly used by Service Providers to provide services within an MPLS cloud with multiple customers. When we hear about VRF, its almost synonymous to MPLS VPN.
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