Cisco ONS 15454 SDH Specifications download pdf (Page 433)

A-3

Cisco ONS 15454 SDH Installation and Operations Guide, R3.3

May 2002

Appendix A Circuit Routing

Manual Circuit Routing

Figure A-2 Secondary sources and drops

Several rules apply to secondary sources and drops:

• CTC does not allow a secondary destination for unidirectional circuits because you can always

specify additional destinations (drops) after you create the circuit

• Primary and secondary sources should be on the same node

• Primary and secondary destinations should be on the same node

• Secondary sources and destinations are permitted only for regular VC connections (not for VC

low-order path tunnels and multicard EtherSwitch circuits)

• For point-to-point (straight) Ethernet circuits, only SDH VC4 endpoints can be specified as multiple

sources or drops

For bidirectional circuits, CTC creates an SNCP connection at the source node that allows traffic to be

selected from one of the two sources on the ONS 15454 SDH network. If you check the Fully Path

Protected option during circuit creation, traffic is protected within the ONS 15454 SDH network. At the

destination, another SNCP connection is created to bridge traffic from the ONS 15454 SDH 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, an SNCP drop-and-continue connection is created at the source node.

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 VC on each link along the route

• Create a shared packet ring for Multicard EtherSwitch circuits

• Choose a protected path for Multicard EtherSwitch circuits, allowing virtual SNCP segments

CTC imposes the following rules on manual routes:

• You cannot create manual low-order path circuits (DS3i or E3 cards).

• All circuits, except Multicard EtherSwitch circuits in a shared packet ring, should have links with a

direction that flows from source to destination. This is true for Multicard EtherSwitch circuits that

are not in a shared packet ring (see Figure A-1).

71815

Primary source

Secondary source

Primary destination

Secondary destination

Vendor A

network

Vendor B

network

ONS 15454 SDH network

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