Cisco ONS 15600 Series, Reference Manual

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Cisco ONS 15600 Reference Manual, R7.0
Chapter 7 Circuits and Tunnels
7.11 Manual Circuit Routing
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 — UPSR
2 — — 1 UPSR
2 1 — — UPSR
1 2 — — UPSR
1 — — 2 UPSR
— 1 2 — UPSR
2 2 — — Double UPSR
2 — — 2 Double UPSR
— 2 2 — Double UPSR
1 1 — — Two-way
Table 7-8 Unidirectional STS Circuits
No. of Inbound Links No. of Outbound Links No. of Sources No. of Drops Connection Type
1 1 — — One-way
1 2 — — UPSR head end
— 2 1 — UPSR head end
2 — — 1+ UPSR drop and
continue