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New and Changed Features


This section describes the new features and enhancements to existing features in the Junos OS main release and the maintenance releases for Junos Fusion Enterprise.


For more information about the Junos Fusion Enterprise features, see the Junos Fusion Enterprise Feature Guide.

Release 17.4R2 New and Changed Features

There are no new features in Junos OS Release 17.4R2 for Junos Fusion Enterprise.

Release 17.4R1 New and Changed Features

  • Cascade port support on EX9200 line cards (Junos Fusion Enterprise)—Starting with Junos OS Release 17.4R1, interfaces on the following EX9200 line cards can be converted to cascade ports in a Junos Fusion Enterprise topology:

    • EX9200-12QS

    • EX9200-40XS

    • EX9200-40F

    • EX9200-40F-M

    In a Junos Fusion Enterprise topology, the EX9200 switch acts as the aggregation device. A cascade port is a port on the aggregation device that sends and receives control and network traffic from an attached satellite device.

    [See Understanding Junos Fusion Enterprise Software and Hardware Requirements.]

  • Aggregation device support on EX9200 with EX9200-RE2 Routing Engine (Junos Fusion Enterprise)—Starting with Junos OS Release 17.4, EX9200 switches with the EX9200-RE2 Routing Engine module are supported as aggregation devices in a Junos Fusion Enterprise. The EX9200-RE2 module supports virtual machine (VM) architecture in an EX9200 switch.

    [See Understanding Junos Fusion Enterprise Software and Hardware Requirements.]

  • EVPN-MPLS interworking with Junos Fusion Enterprise (EX9200 switches)—Starting with Junos OS Release 17.4R1, you can use Ethernet VPN (EVPN) to extend your Junos Fusion Enterprise over an MPLS network to a geographically distributed campus or enterprise network.

    The EVPN-MPLS interworking feature offers the following benefits:

    • Ability to use separate virtual routing and forwarding (VRF) instances to control inter-VLAN routing.

    • VLAN translation.

    • Default Layer 3 virtual gateway support, which eliminates the need to run such protocols as Virtual Router Redundancy Protocol (VRRP).

    • Load balancing to better utilize both links when using EVPN multihoming.

    • The use of EVPN type 2 advertisement routes (MAC+IP) reduces the need for flooding domains with ARP packets.

    [See Understanding EVPN-MPLS Interworking with Junos Fusion Enterprise and MC-LAG.]