Example of Only an REI-P Counter Incrementing

In Figure 19, the wavy line indicates that there is a line error in the section between ADM1 and ADM2.

All diagnostics are from the perspective of Router2 (the Juniper Networks router).

Figure 19: Example of a Router Receiving Only an REI-P Counter Incrementing

What It Means

In Figure 19, the progression of events occurring after the failure is as follows:

1. ADM1 detects parity errors in the B1 byte.
2. ADM1 sends an REI-L upstream to ADM2.
3. Router1 detects parity errors in the B3 byte.
4. Router1 sends an REI-P upstream to Router2.
5. Router2 only sees an REI-P incrementing counter.