Bidirectional Switching Mode

In bidirectional switching mode, the router switches both ends of an APS pair to the same working interface or to the same protect interface when either end determines that a switch is required.

Possible reasons for initiating a bidirectional switch include:

• Detection of a signal failure
• Receipt of an aps force or aps manual from the local end of an APS pair
• Reversion to the working interface after a failure has been corrected and the timeout value specified in aps revert has expired

The devices at both the local and remote ends of an APS pair must support bidirectional switching for the router to implement bidirectional switching mode. Otherwise, the router implements unidirectional switching mode at both ends of the APS pair.

The router detects support for bidirectional switching by interpreting the values of the K1 and K2 bytes in the SONET/SDH frame. For details about the meanings of the values of K1 and K2 bytes, see Communication Methods.

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