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Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter11 SDH Topologies and Up grades
11.4.1 MS-SPRing DR I
Figure 11-20 shows ONS 15454 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 node s.
Figure11-20 ONS 15454 SDH Integrated MS-SPRing Dual Ring Interconnect
Service Selector
Secondary Path (protection)
Primary Path (working)
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MS-SPRing 1
Primary
Secondary
MS-SPRing 2
Node 8
Node 3
Node 1 Node 2
Node 6Node 7
Node 5
Node 4