Manual Circuit Routing; Table 7-7 Bidirectional Sts Circuits - Cisco ONS 15600 Reference Manual

Chapter 7 Circuits and Tunnels
•
For bidirectional circuits, CTC creates a path protection connection at the source node that allows traffic
to be selected from one of the two sources on the ONS 15600 network. If you check the Fully Path
Protected option during circuit creation, traffic is protected within the ONS 15600 network. At the
destination, another path protection connection is created to bridge traffic from the ONS 15600 network
to the two destinations. A similar but opposite path exists for the reverse traffic flowing from the
destinations to the sources.
For unidirectional circuits, a path protection drop-and-continue connection is created at the source node.

7.10 Manual Circuit Routing

Routing circuits manually allows you to:
•
•
CTC imposes the following rules on manual routes:
•
•
•
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
generates an error.
Table 7-7
No. of Inbound Links
—
2
2
1
1
—
2
2
—
1
Table 7-8
generates an error.
Secondary sources and destinations are permitted only for regular STS connections.
Choose a specific path, not just the shortest path chosen by automatic routing.
Choose a specific STS on each link along the route.
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.
summarizes the available bidirectional connections. Any other combination is invalid and
Bidirectional STS Circuits
No. of Outbound Links No. of Sources
2
—
1
2
—
1
2
—
2
1
summarizes the available unidirectional connections. Any other combination is invalid and
No. of Drops
1 —
— 1
— —
— —
— 2
2 —
— —
— 2
2 —
— —
Cisco ONS 15600 Reference Manual, R6.0
7.10 Manual Circuit Routing
Connection Type
UPSR
UPSR
UPSR
UPSR
UPSR
UPSR
Double UPSR
Double UPSR
Double UPSR
Two-way
7-17