When a user creates a VC12 or VC3 service, an error message is displayed indicating that protection subnets cannot be found.

The VC12 or VC3 service being created traverses NEs whose main control board versions are 4.XX.XX.XX, but no protection subnet has been created for links on these NEs.

1. Create protection subnets on NEs whose main control board versions are 4.XX.XX.XX.

2. Create a VC12 or VC3 trail again. For details, see Chapter SDH and Radio Trails Management>Creating SDH Trails in the OG for MSTP and Radio Services Management.