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Cisco ONS 15600 SDH Reference Manual, Release 9.0
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Chapter 8 SDH Topologies and Upgrades
8.5.1 MS-SPRing DRI
Figure 8-9
ONS 15600 SDH Traditional MS-SPRing Dual-Ring Interconnect (Same-Side Routing)
shows ONS 15600 SDHs in a traditional MS-SPRing DRI topology with opposite-side
routing. In Ring 1, Nodes 3 and 4 are the interconnect nodes, and in Ring 2, Nodes 8 and 9. Duplicate
signals are sent from Node 4 (Ring 1) to Node 8 (Ring 2), and from Node 3 (Ring 1) to Node 9 (Ring 2).
In Ring 1, traffic at Node 4 is dropped (to Node 9) and continued (to Node 3). Similarly, at Node 8,
traffic is dropped (to Node 3) and continued (to Node 9).
Service Selector
Secondary Path
Primary Path, Drop and Continue to Bridge
Drop and Continue
159570
MS-SPRing
Ring 1
Primary
Node
Secondary
Node
Node 5
Node 4
Node 3
Node 9
Node 8
Node 1
Node 2
MS-SPRing
Ring 2
Primary
Node
Secondary
Node
Node 10
Node 6
Node 7