The subnet address of each link is of the form 10.0.x.y, and each link has a 24-bit mask. For example, the link between 7200a and 12008a is 10.0.3.0/24, the IP address of 7200a's side of the link is 10.0.3.4 (because 7200a's RID is 220.127.116.11), and 12008a's side of the link has the address 10.0.3.5 (because 12008a's RID is 18.104.22.168).
Most of the troubleshooting scenarios revolve around a single TE tunnel. 7200a is the headend of this tunnel, tunnel1, which is referred to as the primary tunnel. 7200c is the tunnel's tail. The rest of the LSRs shown are potential midpoints for this tunnel.
When there are no failures in the sample network, the primary tunnel path is
72003""^ 12008a- 12008c-—*7200c. This is shown in the highlighted text of Example 11-1.
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