RPR Interconnection Topologies

1. RPR Interconnection Topologies zhaisuping@huawei.com yanw@huawei.com IEEE802.17 WG Orlando, Florida USA March 11~16, 2007

2. Two Basic RPR Interconnection Topologies Topology A Topology B

3. The Comparison of Two Topologies

4. The Comparison of Two Topologies – Cont. Tentative Conclusion (need further discussion): When the requirement of network deployment flexibility outweighs the cost, then the Topology B is used, or else the Topology A is recommended in the RPR interconnection rings network.

5. The following slides will illustrate the different application scenarios for the interconnected RPR rings. The following figures take the Topology A as example, but the same topologies also apply to Topology B as well.

6. Application Scenario 1 • There are several subtending rings across one ring. • Each pair of interconnected stations ({A, B} and {C,D}) are independent and belong to different protection groups.

7. Application Scenario 2 • There are several subtending rings across one ring, and these subtending rings share a common station. • Each pair of interconnected stations ({A, B} and {B, C}) are independent and belong to different protection groups.

8. Application Scenario 3 • There are several subtending rings across one ring, and these subtending rings share the same interconnection stations. • For the usual deployment, subtending access rings are not communicated each other, they only need to communicate with the aggregation rings. • But if the subtending access rings need to communicate each other, they still can at the cost of some implementation complexity.

9. Application Scenario 4 • We don’t want support this disordered topologies. Do we want?

10. Thank you