In-Depth MPLS VPN Troubleshooting

In-depth MPLS VPN troubleshooting is usually performed exclusively on the control plane. The few MPLS VPN-specific errors that can occur on the data plane are almost always a result of a software bug and are best left to the Cisco Systems engineers.

To understand the steps in MPLS VPN troubleshooting, it is worth re-examining the steps that an IP prefix undertakes as it is propagated from the egress CE router to the ingress CE router, as shown in Figure 9-4.

Figure 9-4. Route Propagation Across MPLS VPN Network

NOTE

You might be confused by the claim that the IP prefix is propagated from the egress CE router to ...

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