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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

Node 1

Node 2

Node 3

Node 4

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

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

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

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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