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Why Use a Nondefault Management Interface?

 

By default, in Junos OS, the management Ethernet interface (usually named fxp0 or em0) provides the out-of-band management network for the device. There is no clear separation between either out-of-band management traffic and in-band protocol control traffic, that is, user traffic at the routing-instance or routing-table level. Instead, all traffic is handled through the default routing instance, giving rise to concerns over security, performance, and how to troubleshoot.