Yes it is supported only inMX/PTX/QFX/SRX boxes
Management Ethernet interface (fxp0) is confined in a non-default virtual routing and forwarding table Junos OS can confine the management interface in a dedicated management instance by setting the CLI configuration statement management-instance at the [edit system] hierarchy level. By doing so, operators can ensure that management traffic no longer has to share a routing table (that is, default.inet.0 table) with other control or protocol traffic in the system. Instead, there is a mgmt_junos routing instance introduced for management traffic. This feature is supported on following products/applications: Product Introduced Release Prerequisites MX Series PTX Series QFX Series SRX Series
MX Series
PTX Series
QFX Series
SRX Series