MPLS Basic Configuration (Frame Mode)

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Topology:





OSPF Configuration

Step 1: Set Router ID and Networks, redistributre networks (10.10.10.0/24 and 20.20.20.0/24) in to OSPF on R2 and R4.

R2(config)#router ospf 1
R2(config-router)#router-id 1.1.1.1
R2(config-router)#network 192.168.1.0 0.0.0.255 area 0
R2(config-router)#redistribute connected subnets

R3(config)#router ospf 1
R3(config-router)#router-id 2.2.2.2
R3(config-router)#network 192.168.1.0 0.0.0.255 area 0
R3(config-router)#network 172.16.0.0 0.0.255.255 area 0

R4(config)#router ospf 1
R3(config-router)#router-id 3.3.3.3
R3(config-router)#network 172.16.0.0 0.0.255.255 area 0
R3(config-router)#redistribute connected subnets

Step 2: Verifying OSPF by using “show ip ospf neighbor” and “show ip route ospf” commands.

Neighbor tables of R2, R3 and R4:



Routing tables of R2, R3, R4:



Step 3: Trace Route from network 10.10.10.0/24 to network 20.20.20.0/24 on R2



MPLS Configuration

Step 1: Enable MPLS on each interface in core network:

R2(config)#ip cef
R2(config)#int f0/0
R2(config-if)#mpls ip

R3(config)#ip cef
R3(config)#int f0/0
R3(config-if)#mpls ip
R3(config-if)#int f0/1
R3(config-if)#mpls ip

R4(config)#ip cef
R4(config)#int f0/1
R4(config-if)#mpls ip

Syslogs on R3:



Step 2: Verifying MPLS:

R2:



R3:



R4:





Different between without MPLS and MPLS enabled:

Trace route to 20.20.20.200 on R2 with source ip address is 10.10.10.1.

• Without MPLS:

• MPLS enabled: