The AToM troubleshooting process consists of troubleshooting the PE to PE router tunnel label switch path (LSP) and the exchange of VC labels between the peer PE routers.
The flowchart in Figure 7-13 describes the troubleshooting process used with AToM. You can use this flowchart to quickly access the section of the chapter relevant to problems you are experiencing on your network.
The reference topology shown in Figure 7-14 is used throughout this section.
In Figure 7-14, three virtual circuits (pseudowires) are carried over the MPLS backbone between London_PE ...