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Application of Tangent RRPP Rings
Metro Ethernet typically uses two-layer rings:
One layer is the aggregation layer between aggregation devices PE-AGGs (for example, RRPP domain 1 in Figure 18-21).
The other layer is the access layer between PE-AGGs and UPEs (for example, RRPP domain 2 and RRPP domain 3 in Figure 18-21).
Tangent RRPP rings can be used in this scenario, as shown in Figure 18-21. The aggregation layer and access layer are RRPP rings and the different layer's rings are tangent.