Ethernet Shared Packet Ring Routing; Ethernet And Path Protection; Bidirectional Sts/Vt/Regular Multicard Etherswitch/Point-To-Point (Straight) Ethernet Circuits - Cisco 15454-DS1-14= - 1.544Mbps Expansion Module Reference Manual

Chapter 11 Circuits and Tunnels
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
Path protection
Path protection
Path protection
Path protection
Path protection
Path protection
Double path protection
78-18106-01

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 11-32
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 —
Cisco ONS 15454 Reference Manual, R8.5
11.16 Manual Circuit Routing
Node 5 Node 6
Path Protection
Segment
Node 7 Node 8
Illegal
Number of
Destinations
—
1
—
—
2
—
—
Drop
Node 11
11-31