CCIE SP MPLS FAQ: MPLS VPN Troubleshooting
Figure: Sample MPLS VPN Network
Q1. What are the common errors that occur in an MPLS VPN network that are not a result of MPLS VPN design or configuration error?
Q2. When would the RIP routing process between the CE and PE router be broken?
Q3. When would an RIP subnet get inserted as a major network into MP-BGP?
Q4. Why would a route received from a CE router not be propagated to other PE routers?
Q5. When would the export route target specified in the VRF definition not be attached to the MP-BGP route?
Q6. Why would a receiving PE router ignore an MP-BGP route?
Q7. Why would a receiving PE router decide to ignore an MP-BGP route even though there is a match in the route targets attached to the MP-BGP route and route targets configured in the VRF?
8: Why would an MP-BGP route received from another PE router not be propagated to the CE router?