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New and Changed Features


This section describes the new features and enhancements to existing features in Junos OS Release 14.1R9 for the EX Series.


  • High-speed Switch Fabric module for EX9200 switches—Starting with Junos OS Release 14.1, a high-speed Switch Fabric module, EX9200-SF2, is supported. Compared to the original SF module, EX9200-SF, EX9200-SF2 offers increased bandwidth, providing higher-capacity traffic support in settings that require greater interface density (slot and capacity scale).

    SF modules are installed horizontally on the front panel of the switch chassis. You can install either one or two SF modules in an EX9204 or EX9208 switch and either two or three SF modules in an EX9214 switch.

    The Switch Fabric serves as the central nonblocking matrix through which all network data passes. The key functions of the Switch Fabric are:

    • Monitor and control system functions

    • Interconnection of all line cards

    • Clocking, system resets, and booting control

    • Routing Engine carrier

    EX9200-SF2 supports all EX9200 line cards.


    When you upgrade from an EX9200-SF module to an EX9200-SF2 module in an EX9200 switch, the SF module types (that is, EX9200-SF and EX9200-SF2) can co-exist in the switch during the upgrade. However, if you do replace just one module during an upgrade, you must replace any remaining EX9200-SF modules with EX9200-SF2 modules before you begin using the switch for normal operations—that is, for the switch to function properly, it must contain only one type of SF module. [See Upgrading an EX9200-SF to an EX9200-SF2.]

Flow Monitoring

  • EX9200 Virtual Chassis support for inline flow monitoring (EX9200 Virtual Chassis)—Starting with Junos OS Release 14.1R3, you can configure inline flow monitoring for an EX9200 Virtual Chassis. Inline flow monitoring enables you to actively monitor the flow of traffic by means of a switch participating in the network. Inline flow monitoring for an EX9200 Virtual Chassis provides support for the following:

    • Active sampling and exporting of both IPv4 and IPv6 traffic flows

    • Sampling traffic flows in both ingress and egress directions

    • Configuring flow collection on either IPv4 or IPv6 devices

    • Using the IPFIX flow collection template for traffic sampling (both IPv4 and IPv6 export records)

Basic configuration of inline flow monitoring on the EX9200 Virtual Chassis comprises these steps:

  1. Enable the Virtual Chassis configuration. See Configuring an EX9200 Virtual Chassis.
  2. Set up the export version, family to be sampled, and template to be used at the [edit forwarding-options] hierarchy level.
  3. Configure the IPFIX template at the [edit services flow-monitoring] hierarchy level.
  4. Configure the firewall term at the [edit firewall] hierarchy level.
  5. Associate the sampling instance to the master or backup switch and the corresponding FPC slot at the [edit chassis member member-number fpc slot slot-number] hierarchy level.
  6. Associate the firewall term with the interface on which you have enabled ingress or egress sampling.

Platform and Infrastructure

  • Allow DHCP clients to send packets without Option 255 (EX9200)—On EX9200 switches, starting with Junos OS Release 14.1, you can configure DHCP relay to enable clients to send DHCP packets without Option 255 (end-of-options). The default behavior in Junos OS is to drop packets that do not include Option 255. To override this default behavior, you can configure the allow-no-end-options CLI statement under the [edit forwarding-options dhcp-relay overrides] hierarchy level.