Cisco ONS 15600 Reference Manual page 163

Chapter 8 SDH Topologies and Upgrades
Figure 8-9
Figure 8-10
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).
78-18400-01
ONS 15600 SDH Traditional MS-SPRing Dual-Ring Interconnect (Same-Side Routing)
Node 5
Node 4
Node 9
Node 10
Drop and Continue
Service Selector
Primary Path, Drop and Continue to Bridge
Secondary Path
shows ONS 15600 SDHs in a traditional MS-SPRing DRI topology with opposite-side
Node 1
MS-SPRing
Ring 1
Primary Secondary
Node Node
Primary Secondary
Node Node
MS-SPRing
Ring 2
Node 6
Cisco ONS 15600 SDH Reference Manual, Release 9.0
8.5.1 MS-SPRing DRI
Node 2
Node 3
Node 8
Node 7
8-11