28.7.10 Prohibited configurations for the multi-fault monitoring functionality
The prohibited configurations when the multi-fault monitoring functionality is used are as follows.
- <Structure of this section>
(1) Configuration where multiple shared link monitoring rings use the same backup ring
Shared link monitoring rings and shared link non-monitoring rings used as backup rings during multi-fault detection must be configured with a one-to-one association. When multiple shared link monitoring rings use the same shared link non-monitoring ring as a backup ring, and a multi-fault is detected on one of the shared link monitoring rings, another shared link monitoring ring turns into a loop configuration spanning the backup ring.
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![[Figure Data]](./GRAPHICS/ZU117530.GIF)
(2) Configuration that monitors multiple failures on shared nodes in a shared link
Shared nodes monitoring multi-faults need to be placed at both ends of shared links. Therefore, monitoring cannot be performed properly for configurations like that shown in the figure below, in which shared nodes within a shared link monitor multi-faults. Also, switching cannot be performed properly to the backup ring when a multi-fault occurs.
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![[Figure Data]](./GRAPHICS/ZU117540.GIF)