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Practice Lab 3—The VPN Lab > Section 5: OSPF and MP-BGP (9 Points)

Section 5: OSPF and MP-BGP (9 Points)

  • Configure OSPF per Figure 3-12 for your VRF RED with a process number of 3 on PE Router R1 and Sw3 using VLAN50 for connectivity. Use a process ID of 2 on PE Router R6 and CE device Sw4 using VLAN100 for connectivity. You should permit only internal OSPF routes to be advertised across your VPN and ensure the redistribution of BGP routes into OSPF are assigned as Type 1 external routes with no manually adjusted cost associated to them. It is acceptable for these routes to come through as /32 routes because of default OSPF behavior of Loopback interfaces. (3 points)

You are requested to configure OSPF over your MPLS network between CE devices Sw3 and Sw4 via your PE Routers R1 and R6. Figure 3-12 indicates that all loopback interfaces are to be included in OSPF on both CE devices. You should be aware that OSPF will advertise these as host routes, but the question states that this is acceptable behavior. Similarly to the EIGRP question, you are requested to manipulate the redistribution of the IGP into BGP, but in reality the routes would appear to have not been redistributed through another routing protocol by default. This direction is actually a red herring for the next question when the routes at the CE devices appear as external routes when they should in fact be internal routes. You are requested to permit only internal OSPF routes to be redistributed into BGP, which is a simple match internal parameter on the redistribution configuration. You should, of course, remember that the MPLS network is seen as an OSPF super backbone, and as such you had no configuration for Area 0 to enable Area 1 to communicate with Area 2 over MPLS. Example 3-17 details the required configuration and verification. If you have configured this correctly, as shown in Example 3-17, you have scored 3 points.


  

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