10-20
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
Chapter10 Circuits and Tunnels
10.12 Manual Circuit Routing
Figure10-10 Ethernet and SNCP
Low-order tunnels cannot be the endpoint of an SNCP segment. A SNCP segment endpoint is where
the SNCP selector resides.
If you provision full path protection, 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.
Table10-8 throu gh Table10-11 on page 10-21 su mmarize the available node connections. Any other
combination is invalid and generates an error.
83951
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
Table10-8 Bidirectional VC/TUG/Regular Multicard EtherSwitch/Point-to-Point (Straight)
Ethernet Circuits
Connection Type
Number of
Inbound Links
Number of
Outbound Links
Number of
Sources
Number of
Drops
SNCP — 2 1
SNCP 2 — 1
SNCP 2 1 ��� —
SNCP 1 2 — —
SNCP 1 — 2
SNCP — 1 2
Double SNCP 2 2
Double SNCP 2 2
Double SNCP 2 2
Two wa y 1 1
Ethernet 0 or 1 0 or 1 Ethernet node
source
Ethernet 0 or 1 0 or 1 Ethernet
node drop