service internal command is a hidden command that is used to enable certain command line features as may be used by Cisco engineer to check some internal commands of the platform while troubleshooting. This command enable internal platform level commands. Like for example on 7600/6500 platform, you can perform ELAM capture (used to capture a single packet either on DFC or SP ) only after you enable "service internal".
Hope this answers your question. Let me know if you have any further questions.
This document is an early notification of a behaviour change that will be introduced in IOS XR release 6.5.
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