Cisco 15454-TCC - Network Processor Card Operation Manual page 393

Appendix A Circuit Routing
Figure A-5
Ethernet source
• Multicard EtherSwitch circuits can have virtual UPSR segments if the source or destination is not
in the UPSR domain. This restriction also applies after circuit creation; therefore if you create a
circuit with UPSR segments, Ethernet node drops cannot exist anywhere on the UPSR segment (see
Figure
Figure A-6
Source
VT Tunnels cannot be an endpoint of a UPSR segment. A UPSR segment endpoint is where the
•
UPSR 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.
Table A-1
# of Inbound Links
-
2
2
1
1
-
2
2
November 2001
Ethernet shared packet ring routing
Node 1 Node 2
Node 3 Node 4
A-6).
Ethernet and UPSR
Node 2 Node 5 Node 6
UPSR Segment
Node 7 Node 8
Legal
Bidirectional STS/VT/Regular Multicard EtherSwitch/Point-to-Point (straight) Ethernet
Circuits
# of Outbound Links
2
-
1
2
-
1
2
-
Ethernet destination
Source
Drop
Node 11
# of Sources # of Drops
1 -
- 1
- -
- -
- 2
2 -
- -
- 2
Cisco ONS 15454 Installation and Operations Guide
Manual Circuit Routing
Node 5 Node 6
UPSR Segment
Node 7 Node 8
Illegal
Connection Type
UPSR
UPSR
UPSR
UPSR
UPSR
UPSR
Double UPSR
Double UPSR
Drop
Node 11
A-5