Cisco ONS 15454 SDH E1-75 Manuale - Pagina 22

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Cisco ONS 15454 SDH E1-75 Manuale
11.14 Manual Circuit Routing
Figure 11-7
Source
Figure 11-8
Mixing 1+1 or MS-SPRing Protected Links with an SNCP
SNCP
Node 1
(source)
Node 3
Cisco ONS 15454 SDH Reference Manual, R8.5
11-22
Alternate Paths for Virtual SNCP Segments
SNCP
SNCP
Node 1
Node 2
Node 3
Node 4
Two way
Two way
Path Segment 1
Path Segment 2
SNCP/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 an SNCP selector based on the links chosen, the input links to the SNCP selectors
cannot be 1+1 or MS-SPRing protected
SNCP
Node 2
(destination)
MS-SPRing
Node 4
Illegal
Unprotected
Choose the links of multicard EtherSwitch circuits in a shared packet ring to route the circuit from
source to destination back to source
loops is invalid.
Two way
Two way
1+1
Node 5
Node 6
MS-SPRing
Node 7
Node 8
Two way
Path Segment 3
MS-SPRing protected
No need for alternate path
(Figure
11-8). The same rule applies at the SNCP bridge.
SNCP
SNCP
Unprotected
Node 1
Node 2
(source)
1+1 protected
Node 4
Node 3
(destination)
Unprotected
Illegal
(Figure
11-9). Otherwise, a route (set of links) chosen with
Chapter 11 Circuits and Tunnels
Node 9
Node 10
Node 11
Node 12
1+1
1+1
Two way
Path Segment 4
1+1 protected
SNCP
Unprotected
Node 1
Node 2
(source)
Unprotected
Node 4
(destination)
Node 3
Unprotected
Legal
Drop
Two way
SNCP
Unprotected
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