Alternate Paths For Virtual Path Protection Segments; Figure 11-11 Mixing 1+1 Or Blsr Protected Links With A Path Protection Configuration - Cisco 15454-DS1-14= - 1.544Mbps Expansion Module Reference Manual

11.16 Manual Circuit Routing
Figure 11-10
Source
•
•
Figure 11-11 Mixing 1+1 or BLSR Protected Links With a Path Protection Configuration
Unidirectional
Node 1
(source)
Node 3
•
Cisco ONS 15454 Reference Manual, R8.5
11-30

Alternate Paths for Virtual Path Protection Segments

Unidirectional Unidirectional
Node 1 Node 2
Node 3 Node 4
Twoway Twoway
Path Segment 1 Path Segment 2
Path/MESH 1+1 protected
protected
Needs alternate path
from N1 to N2
For multicard EtherSwitch circuits, the Fully Path Protected option is ignored.
For a node that has a path protection selector based on the links chosen, the input links to the path
protection selectors cannot be 1+1 or BLSR protected
path protection bridge.
Unidirectional
Node 2
(destination)
BLSR ring
Node 4
Unidirectional
Illegal
Unprotected
In a shared packet ring, choose the links of multicard EtherSwitch circuits to route from source to
destination back to source
invalid.
Twoway Twoway
1+1
Node 5 Node 6
BLSR ring
Node 7 Node 8
Twoway
Path Segment 3
BLSR protected
No need for alternate path
Unidirectional
Unprotected
Node 1 Node 2
(source)
1+1 protected
Node 4
Node 3 (destination)
Unprotected
Illegal
(Figure 11-12). Otherwise, a route (set of links) chosen with loops is
Chapter 11
Node 9 Node 10
Node 11 Node 12
1+1 1+1
Twoway
Path Segment 4
1+1 protected
(Figure 11-11). The same rule applies at the
Unidirectional Unidirectional
Unprotected
Node 1 Node 2
(source)
Unprotected
Node 4
(destination)
Node 3
Unprotected
Legal
Circuits and Tunnels
Drop
Twoway
Unprotected
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