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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 8-10
ONS 15600 SDH Traditional MS-SPRing Dual-Ring Interconnect (Opposite-Side
Routing)
shows ONS 15600 SDHs in an integrated MS-SPRing DRI topology. The same
drop-and-continue traffic routing occurs at two nodes, rather than four. This is achieved by installing an
additional STM-N trunk at the two interconnect nodes. Nodes 3 and 8 are the interconnect nodes.
Service Selector
Secondary Path
Primary Path, Drop and Continue to Bridge
Drop and Continue
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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
Secondary
Node
Primary
Node
Node 10
Node 6
Node 7