Cisco ONS 15454 Reference Manual page 366

11.15 11.15 Manual Circuit Routing
Figure 11-12
Ethernet source
• Multicard EtherSwitch circuits can have virtual path protection segments if the source or destination
is not in the path protection domain. This restriction also applies after circuit creation; therefore, if
you create a circuit with path protection segments, Ethernet destinations cannot exist anywhere on
the path protection segment
Figure 11-13
Source
A VT tunnel cannot be the endpoint of a path protection segment. A path protection segment
•
endpoint is where the path protection 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.
Table 11-12
combination is invalid and generates an error.
Table 11-12
Connection Type
UPSR
UPSR
UPSR
UPSR
UPSR
UPSR
Double UPSR
Cisco ONS 15454 Reference Manual, R7.0.1
11-30
Ethernet Shared Packet Ring Routing
Node 1 Node 2
Node 3 Node 4
(Figure
Ethernet and Path Protection
Node 2 Node 5 Node 6
Path Protection
Segment
Node 7 Node 8
Legal
through Table 11-15 on page 11-31
Bidirectional STS/VT/Regular Multicard EtherSwitch/Point-to-Point (Straight)
Ethernet Circuits
Number of
Inbound Links
—
2
2
1
1
—
2
Ethernet destination
11-13).
Source
Drop
Node 11
summarize the available node connections. Any other
Number of Number of
Outbound Links Sources
2 1
— —
1 —
2 —
— —
1 2
2 —
Chapter 11 Circuits and Tunnels
Node 5 Node 6
Path Protection
Segment
Node 7 Node 8
Illegal
Number of
Destinations
—
1
—
—
2
—
—
OL-9217-01
Drop
Node 11