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CHAPTER
10-1
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
10
Circuits and Tunnels
This chapter explains Cisco ONS 15454 SDH high-order and low-order circuits; low-order, data
communication channel (DCC), and IP-encapsulated tunnels; and virtual concatenated (VCAT) circuits.
To provision circuits and tunnels, refer to the Cisco ONS 15454 SDH Procedure Guide.
Chapter topics include:
• 10.1 Overview, page 10-1
• 10.2 Circuit Properties, page 10-2
• 10.3 Cross-Connect Card Bandwidth, page 10-9
• 10.4 DCC Tunnels, page 10-10
• 10.5 Multiple Destinations for Unidirectional Circuits, page 10-12
• 10.6 Monitor Circuits, page 10-12
• 10.7 SNCP Circuits, page 10-12
• 10.8 MS-SPRing Protection Channel Access Circuits, page 10-14
• 10.9 Path Trace, page 10-15
• 10.10 Path Signal Label, C2 Byte, page 10-15
• 10.11 Automatic Circuit Routing, page 10-16
• 10.12 Manual Circuit Routing, page 10-18
• 10.13 Constraint-Based Circuit Routing, page 10-22
• 10.14 Virtual Concatenated Circuits, page 10-22
• 10.15 Merge Circuits, page 10-24
• 10.16 Reconfigure Circuits, page 10-25
10.1 Overview
You can create circuits across and within ONS 15454 SDH nodes and assign different attributes to
circuits. For example, you can:
• Create one-way, two-way (bidirectional), or broadcast circuits. VC low-order path tunnels
(VC_LO_PATH_TUNNEL) are automatically set to bidirectional and do not use multiple drops.
• Assign user-defined names to circuits.
• Assign different circuit sizes.