CISCO VRF
Virtual Routing and Forwarding (VRF)
In IP-based computer networks, virtual routing and forwarding (VRF) is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time.
R1
In IP-based computer networks, virtual routing and forwarding (VRF) is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time.
R1
hostname R1
int e0/0
ip add 172.16.1.1 255.255.255.0
no shutdown
R2
hostname R2
int e0/0
ip add 172.16.2.1 255.255.255.0
no shutdown
R3
hostname R3
int e0/0
ip add 172.16.3.1 255.255.255.0
no shutdown
R4
hostname R4
int e0/0
ip add 172.16.4.1 255.255.255.0
no shutdown
R5
hostname R5
ip vrf red
ip vrf blue
int e0/0
ip vrf forwading blue
ip add 172.16.4.2 255.255.255.0
no shutdown
int e0/1
ip vrf forwading red
ip add 172.16.2.2 255.255.255.0
no shutdown
ip vrf forwading blue
int e0/2
ip add 172.16.3.2 255.255.255.0
no shutdown
int e0/3
ip vrf forwading red
ip add 172.16.1.2 255.255.255.0
no shutdown
Open Shortest Path First (OSPF)
You need to set which region allocation to allow the interface when configuring any OSPF router. In region assignment, OSPF has a set of simple guidelines. Area setup must be achieved by OSPF. Now continue the command to set the OSPF,
R1
router ospf 1
network 172.16.1.0 0.0.0.255 area 0
network 1.1.1.1 0.0.0.0 area 0
R2
router ospf 1
network 172.16.2.0 0.0.0.255 area 0
network 2.2.2.2 0.0.0.0 area 0
R3
router ospf 1
network 172.16.3.0 0.0.0.255 area 0
network 3.3.3.3 0.0.0.0 area 0
R4
router ospf 1
network 172.16.4.0 0.0.0.255 area 0
network 4.4.4.4 0.0.0.0 area 0
R5
router ospf 1 vrf red
network 172.16.1.0 0.0.0.255 area 0
network 172.16.2.0 0.0.0.255 area 0
router ospf 2 vrf blue
network 172.16.3.0 0.0.0.255 area 0
network 172.16.4.0 0.0.0.255 area 0
do show ip ro vrf red ospf
do show ip ro vrf blue ospf
do ping vrf red 172.16.1.2
do ping vrf red 172.16.2.2
do ping vrf blue 172.16.3.2
do ping vrf blue 172.16.4.2
You can see the picture result below,