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Cisco ONS 15600 Reference Manual, R7.2
Chapter 7 Circuits and Tunnels
7.11 Manual Circuit Routing
Note
Automatic routing and its associated subfields are not available if both the Automatic Circuit Routing
NE default and the Network Circuit Automatic Routing Overridable NE default are set to FALSE. For
a full description of these defaults see Appendix C, “Network Element Defaults.”
7.11 Manual Circuit Routing
Routing circuits manually allows you to:
•
Choose a specific path, not just the shortest path chosen by automatic routing.
•
Choose a specific STS on each link along the route.
CTC imposes the following rules on manual routes:
•
All circuits in a shared packet ring should have links with a direction that flows from source to
destination.
•
If you enabled Fully Protected Path, choose a diverse protect (alternate) path for every unprotected
segment.
•
For a node that has a path protection selector based on the links chosen, the input links to the path
protection selectors cannot be 1+1 protected. The same rule applies at the path protection bridge.
If you enabled Fully Protected Path, CTC verifies that the route selection is protected at all segments. A
route can have multiple protection domains with each domain protected by a different scheme.
Table 7-7 summarizes the available bidirectional connections. Any other combination is invalid and
generates an error.
Table 7-8 summarizes the available unidirectional connections. Any other combination is invalid and
generates an error.
Table 7-7 Bidirectional STS Circuits
No. of Inbound Links No. of Outbound Links No. of Sources No. of Drops Connection Type
— 2 1 — path protection
2 — — 1 path protection
2 1 — — path protection
1 2 — — path protection
1 — — 2 path protection
— 1 2 — path protection
22——Double path
protection
2 — — 2 Double path
protection
— 2 2 — Double path
protection
11——Two-way