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Troubleshooting Any Transport over MPLS Based VPNs

Chapter Description

MPLS Layer 3 VPNs allow a service provider to provision IP connectivity for multiple customers over a shared IP backbone, while maintaining complete logical separation of customer traffic and routing information. Learn more about MPLS Layer 3 VPNs in this sample chapter from Cisco.

MPLS VPN Troubleshooting Practice Labs

This section provides some troubleshooting labs to help you to consolidate troubleshooting skills learned in this chapter.

The troubleshooting labs described are based on the network topology shown in Figure 6-49.

The goal of each lab is to restore IP connectivity across the MPLS VPN backbone between CE1 and CE2.

Figure 6-49

Figure 6-49. MPLS VPN Troubleshooting Labs Network Topology

Base configurations for the labs can be found on the Cisco Press Web site (http://www.ciscopress.com/1587051044).

Detailed instructions for loading these base configurations onto your lab routers can be found in Appendix B.

Use tag-switching troubleshooting commands when doing the labs (see Table 6-2).

Troubleshooting Lab 1

mjlnet_CE1 and mjlnet_CE2 have IP connectivity to Chengdu_PE and HongKong_PE, respectively, but no routes are exchanged across the MPLS VPN backbone between the CE routers.

Troubleshoot this issue, and restore end-to-end IP connectivity across the MPLS VPN backbone between mjlnet_CE1 and mjlnet_CE2.

Record symptoms, actions, and solutions in the space provided.

Symptoms:

Actions:

Solution:

Troubleshooting Lab 2

mjlnet_CE1 routes are being received on mjlnet_CE2, but there is still no IP connectivity between the CE routers.

Troubleshoot this issue, and restore end-to-end IP connectivity across the MPLS VPN backbone between mjlnet_CE1 and mjlnet_CE2.

Record symptoms, actions, and solutions in the space provided.

Symptoms:

Actions:

Solution:

Troubleshooting Lab 3

Route exchange is successful between mjlnet_CE1 and mjlnet_CE2, but there is no IP connectivity between them.

Troubleshoot this issue, and restore end-to-end IP connectivity across the MPLS VPN backbone between mjlnet_CE1 and mjlnet_CE2.

Record symptoms, actions, and solutions in the space provided.

Symptoms:

Actions:

Solution: