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28 Chapter 4 Protected Network Topologies

The Traverse supports the following protection schemes in two node ring

interconnections:

• UPSR <–> UPSR

• UPSR <–> BLSR

• BLSR <–> BLSR

• UPSR <–> SNCP ring

• SNCP ring <–> SNCP ring

• SNCP ring <–> MS-SPRing

• MS-SP ring <–> MS-SPRing

Four Node

Interconnected

Rings

This topology uses four nodes to connect two rings. The links between the

interconnecting nodes are unprotected or protected. This topology protects traffic

within each ring, as well as from any failure on the interconnecting node. In this

configuration, each ring can be different speeds, and the connecting links do not have to

be the same speed as either of the rings.

Figure 11 Four-node Interconnected Rings

The Traverse supports the following protection schemes in a four-node interconnected

ring configuration:

• UPSR <–> UPSR

• UPSR <–> MS-SPRing

• UPSR <–> BLSR

• SNCP <–> SNCP

• SNCP <–> UPSR

• SNCP <–> MS-SPRing

• SNCP <–> BLSR

• BLSR <–> BLSR

• BLSR <–> MS-SPRing

• MS-SPRing <–> MS-SPing

Drop-and-continue not supported on interconnecting BLSR or MS-SP ring nodes.

Node 1

Node 2

Node 3

Node 4

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