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Chapter 11 Circuits and Tunnels
11.16 Manual Circuit Routing
Figure 11-10
Alternate Paths for Virtual Path Protection Segments
•
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 (
Figure 11-11
). The same rule applies at the
path protection bridge.
Figure 11-11
Mixing 1+1 or BLSR Protected Links With a Path Protection Configuration
•
In a shared packet ring, choose the links of multicard EtherSwitch circuits to route from source to
destination back to source (
Figure 11-12
). Otherwise, a route (set of links) chosen with loops is
invalid.
55403
BLSR ring
1+1
1+1
1+1
Twoway
Twoway
Twoway
Twoway
Node 8
Node 7
Node 5
Node 6
Unidirectional
Unidirectional
Twoway
Twoway
Node 4
Node 3
Node 1
Node 2
Twoway
Node 12
Node 11
Node 9
Node 10
Source
Path Segment 1
Path/MESH
protected
Needs alternate path
from N1 to N2
Drop
Path Segment 3
BLSR protected
Path Segment 2
1+1 protected
Path Segment 4
1+1 protected
No need for alternate path
55404
Unprotected
Unprotected
Unprotected
Unprotected
Unprotected
Unprotected
1+1 protected
BLSR ring
Node 4
(destination)
Node 3
Unidirectional
Unidirectional
Unidirectional
Unidirectional
Unidirectional
Unidirectional
Node 4
Node 3
Node 1
(source)
Node 2
(destination)
Node 1
(source)
Node 2
Node 1
(source)
Node 2
Node 4
(destination)
Node 3
Illegal
Illegal
Unprotected
Legal
Summary of Contents for 15454-DS1-14= - 1.544Mbps Expansion Module
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