H3C Technologies H3C S12500 Series Switches - Manual (Page 72)

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Figure 12 Schematic diagram for a single-ring network
Tangent rings
As shown in Figure 13 , two or more rings are in the network topology and only one common node exists
between rings. You must define an RRPP domain for each ring.
Figure 13 Schematic diagram for a tangent-ring network
Intersecting rings
As shown in Figure 14 , two or more rings are in the network topology and two common nodes exist
between rings. You only need to define an RRPP domain, and configure one ring as the primary ring and
the other rings as subrings.