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MPLS and VPN Architectures, Volume II by Jeff Apcar, Ivan Pepelnjak, Jim Guichard

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MPLS Control Plane Troubleshooting

If the quick checks have not discovered obvious problems, it is time to go into in-depth troubleshooting. Start with the control plane troubleshooting first because the data plane does not work properly until the labels are exchanged between adjacent LSRs through the control plane protocols (Tag Distribution Protocol [TDP] or LDP). The control plane operation is displayed in Figure 9-2.

Figure 9-2. Control Plane Operations in an LSR

Control plane troubleshooting is focused primarily on the presence of TDP/LDP sessions between adjacent routers and the exchange of labels. In-depth troubleshooting of TDP/LDP operation ...

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