- **I95-58622 IDP Engine Intermittent Start-up:** 6.3.3-R2 introduces the support of multi-core capabilities for IDP for image-based routers. For legacy package-based routers, multi-core IDP capability is not supported, and those systems will continue to operate in the single-core mode. For customers running IDP on older image-based firmware versions (6.3.0-R1 and under) on the SSR1300, SSR1400, and SSR1500, IDP multicore will be automatically enabled when upgrading to 6.3.3-R2. In some cases, after an upgrade the IDP engine can fail to start as it transitions from single-core to multi-core mode. When the IDP engine fails to start, the following alarm will be generated on the system: `IDP engine unable to start; reboot-required`. In this situation, it is recommended to reboot the system post-upgrade to ensure future reliable reboots with IDP multi-core enabled.
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