Cisco ONS 15600 Reference Manual page 166

8.5.2 SNCP DRI
Figure 8-12
Figure 8-13
routing occurs at two nodes, rather than four. This is achieved by installing an addition STM-N trunk at
the two interconnect nodes.
Cisco ONS 15600 SDH Reference Manual, Release 9.0
8-14
ONS 15600 SDH Traditional SNCP Dual-Ring Interconnect
Node 3
Node 4
Node 6
Bridge
Path Selector
Primary Path—Primary
Primary Path—Secondary
Return Path—Primary
Return Path—Secondary
shows ONS 15600 SDHs in an integrated DRI topology. The same drop-and-continue traffic
Node 1
SNCP
Ring 1
Node 5
Duplicate
Signals
Node 7
SNCP
Ring 2
Chapter 8 SDH Topologies and Upgrades
Node 2
Pass-through
Node
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