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Can someone explain what these interfaces are for? I know em0 is used as a management interface on the router to connect via ssh but why are the other two there? I have also noticed, sometimes they have a private address configured by themselves.

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em0 and em1 are the internal interfaces on the Routing Engine (RE).

https://kb.juniper.net/InfoCenter/index?page=content&id=KB33394&cat=MX960_1&actp=LIST&showDraft=false

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