Cisco ONS 15454 SDH Specifications Page 435

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A-5
Cisco ONS 15454 SDH Installation and Operations Guide, R3.3
May 2002
Appendix A Circuit Routing
Manual Circuit Routing
Choose the links of Multicard EtherSwitch circuits in a shared packet ring to route from source to
destination and back to source (see Figure A-5). Otherwise, a route (set of links) chosen with loops
is invalid.
Figure A-5 Ethernet shared packet ring routing
Multicard EtherSwitch circuits can have virtual SNCP segments if the source or destination is not
in the SNCP domain. This restriction also applies after circuit creation; therefore if you create a
circuit with SNCP segments, Ethernet node drops cannot exist anywhere on the SNCP segment (see
Figure A-6).
Note The white arrows show the primary path and the black arrows show the alternate path.
Figure A-6 Ethernet and SNCP
VC low-order path tunnels cannot be an endpoint of an SNCP segment. An SNCP segment endpoint
is where the SNCP selector resides.
If Fully Path Protected is chosen, 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 mechanism.
The following tables summarize the available node connections. Any other combination is invalid and
will generate an error.
71812
Ethernet source
Ethernet destination
Node 4Node 3
Node 1 Node 2
71816
SNCP Segment
Legal
Node 8Node 7
Node 5Node 2
Node 11 Node 11
Node 6
Source
Drop
SNCP Segment
Illegal
Node 8Node 7
Node 5 Node 6
Source
Drop
1+1
1+1
1+1
Table A-1 Bidirectional VC/Regular Multicard EtherSwitch/Point-to-Point (straight) Ethernet
Circuits
# of Inbound Links # of Outbound Links # of Sources # of Drops Connection Type
21 SNCP
2 ——1SNCP
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