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New Features in Junos OS Release 12.3X50-D10 for the QFX Series


  • Support for configuring 40-Gigabit Ethernet interfaces on QFX-QSFP-DAC-1M and QFX-QSFP-DAC-3M QSFP+ direct-attach copper (DAC) cables (QFX3500 and QFX3600 standalone switches)—On QFX3500 and QFX3600 standalone switches, you can configure 40-Gbps QSFP+ DAC cables to operate as 40-Gigabit Ethernet interfaces. [See Interface Support for the QFX3500 Device and Interface Support for the QFX3600 Device.]
  • Support for 1000BASE-BX SFP transceivers (QFX3500 devices)—You can use 1000BASE-BX-U and 1000BASE-BX-D bidirectional SFP transceivers to configure 1000BASE-BX Gigabit Ethernet interfaces.
  • Support for third-party transceivers (QFX3500 and QFX3600 switches)—Allows you to use fiber-optic transceivers made by other vendors with QFX Series switches. The requirement to use Juniper Networks transceivers exclusively has been removed. This feature is enabled by default, and no configuration is required to use this functionality.


  • Layer 3 unicast and multicast support for multichassis link aggregation (QFX3500 and QFX3600 standalone switches)—The following Layer 3 unicast and multicast features are supported:
    • VRRP active-standby support—Enables Layer 3 routing over MC-AE interfaces.
    • Address Resolution Protocol (ARP) synchronization—Enables ARP synchronization to occur independently on MC-LAG peers.
    • Routed VLAN interface (RVI) MAC address synchronization—Enables an MC-LAG peer to forward Layer 3 packets arriving on MC-AE interfaces with either its own RVI MAC address or its peer’s RVI MAC address.
    • DHCP relay with option 82—Enables option 82 on MC-LAG peers. Option 82 provides information about the network location of DHCP clients. The DHCP server uses this information to implement IP addresses or other parameters for the client.
    • Multicast dual designated router (DR)—Enables faster convergence for MC-LAG peer failovers. To configure a dual designated router (DR), issue the set protocols pim interface interface-name dual-dr command for VLAN interfaces on each MC-LAG peer.
    • Private VLAN (PVLAN)—Enables an administrator to split a broadcast domain into multiple isolated broadcast subdomains, essentially putting a VLAN inside a VLAN. A PVLAN can span multiple peers on an MC-LAG.

[See Understanding Multichassis Link Aggregation.]

IPv6 Features

  • Support for IPv6 on network interfaces (QFX3500 and QFX3600 standalone switches)—Enables IPv6 support for many protocols and features on network interfaces on QFX3500 and QFX3600 standalone switches. (IPv6 support for management interfaces was introduced in Junos OS Release 12.2X50-D20.) IPv6 is supported on network interfaces with the following protocols and features:
    • Neighbor discovery
    • Stateless autoconfiguration
    • Router advertisements
    • Link aggregation groups (including hitless forwarding)
    • Routed VLAN interfaces
    • LLDP
    • SSH
    • Telnet
    • Ping
    • Traceroute
    • Virtual routers
    • Static routing
    • RIPv6
    • OSPFv3
    • IS-ISv6
    • BFD
    • BGPv6
    • Graceful restart for routing protocols
    • CoS
    • VRRPv3
    • Firewall filters
    • RADIUS
    • TACACS+
    • AAA
    • SNMP
    • NTP
    • Syslog
    • IPv6 statistics and counters
    • Path MTU discovery

Multicast Protocols

  • Multicast VLAN registration (QFX3500 and QFX3600 standalone switches)—Enables you to efficiently distribute IPTV multicast streams across an Ethernet ring-based Layer 2 network by creating a multicast source VLAN (MVLAN), which becomes the only VLAN over which multicast traffic flows throughout the Layer 2 network. Multicast traffic can then be selectively forwarded from ports on the MVLAN (source ports) to hosts that are connected to ports that are not part of the MVLAN, thereby eliminating the need to send duplicate multicast streams to each requesting VLAN in the network. [See Understanding Multicast VLAN Registration.]
  • IGMP querier (QFX3500 and QFX3600 standalone switches)—Enables multicast traffic to be forwarded between connected switches in pure Layer 2 networks. If you enable IGMP snooping in a Layer 2 network without a multicast router, the IGMP snooping reports are not forwarded between connected switches. This means that if hosts connected to different switches in the network join the same multicast group and traffic for that group arrives on one of the switches, the traffic is not forwarded to the other switches that have hosts that should receive the traffic. If you enable IGMP querying for a VLAN, multicast traffic is forwarded between switches that participate in the VLAN if they are connected to hosts that are members of the relevant multicast group. [See IGMP Snooping Overview.]

Network Management and Monitoring

  • Port mirroring (QFX3500 and QFX3600 standalone switches)—Copies packets entering or exiting a port or entering a VLAN and sends the copies to a system that analyzes the traffic. You can use port mirroring to send traffic to applications that analyze traffic for purposes such as monitoring compliance, enforcing policies, detecting intrusions, monitoring and predicting traffic patterns, correlating events, and so on. Junos OS Release 12.3 adds support for encapsulating the mirrored packets, which means that you can send the mirrored traffic to an IP address. The analyzer system therefore does not have to be on the same LAN as the switch that is mirroring the traffic. [See Understanding Port Mirroring.]
  • Smart DHCP relay (QFX3500 and QFX3600 standalone switches)—Enables you to configure alternative gateway addresses for a Dynamic Host Configuration Protocol (DHCP) server. When you configure a Juniper Networks switch to act as a DHCP relay agent, the switch relays DHCP requests that it receives from hosts to a specified DHCP server. Smart DHCP relay allows you to configure secondary gateway IP addresses for the DHCP server, so that if the server fails to reply to the requests sent to the primary gateway address, the switch can resend the requests to the alternative gateway addresses. [See DHCP and BOOTP Relay Overview.]

Storage and Fibre Channel

  • FIP snooping scaling enhancements (QFX3500 and QFX3600 standalone switches)—Increase the maximum number of FIP snooping sessions from 376 to 2500. [See Understanding VN_Port to VF_Port FIP Snooping on an FCoE Transit Switch and Understanding VN_Port to VN_Port FIP Snooping on an FCoE Transit Switch.]
  • FIP snooping FCoE-FC gateway scaling enhancements (QFX3500 standalone switches)—Increase the maximum number of FIP snooping sessions from 376 to 2500 when the QFX3500 switch acts as an FCoE-FC gateway. [See Understanding FIP Parameters.]
  • FCoE-FC gateway link automated load balancing (QFX3500 standalone switches)—Enables you to automatically redistribute the session load among the active Fibre Channel links when new sessions are initiated. You can also use the CLI to force a load-balancing operation. This feature also introduces a new load-balancing mode based on fabric login (FLOGI) sessions (added to existing session-based and ENode-based load-balancing modes). You can specify different load-balancing modes and automation configurations for different local FC fabrics on the FCoE-FC gateway. [See Understanding Load Balancing in an FCoE-FC Gateway Proxy Fabric.]
  • FCoE OxID hash control (QFX3500 and QFX3600 standalone switches)—Enables you to configure the external LAG load distribution to include or exclude the OxID (originator exchange identifier) in the hash. When FCoE traffic uses a LAG interface, you configure whether or not the LAG uses the OxID in load-balancing traffic over the LAG links. [See Understanding OxID Hash Control for FCoE Traffic Load Balancing.]

System Management

  • Zero Touch Provisioning (QFX3500 and QFX3600 standalone switches)—Zero Touch Provisioning allows you to provision new Juniper Networks switches in your network automatically without manual intervention. When you physically connect a switch to the network and boot it with a default configuration, it attempts to upgrade the Junos OS software automatically and autoinstall a configuration file from the network.

    The switch uses information that you configure on a Dynamic Host Configuration Protocol (DHCP) server to locate the necessary software image and configuration files on the network. If you do not configure the DHCP server to provide this information, the switch boots with the preinstalled software and default configuration.

    The Zero Touch Provisioning process either upgrades or downgrades the Junos OS version. [See Understanding Zero Touch Provisioning.]

Traffic Management

  • Priority-based flow control (PFC) enhancements (QFX3500 and QFX3600 standalone switches)—Enable you to configure up to six lossless forwarding classes. The enhancements enable you to configure values for the maximum receive unit (MRU) and cable length on Ethernet ingress interfaces to fine-tune buffer headroom allocation, and enable you to specify output queues on which to enable the pause function on Ethernet interfaces. [See Understanding CoS IEEE 802.1p Priorities for Lossless Traffic Flows.]
  • Priority remapping (QFX3500 standalone switches)—Enables you to remap IEEE 802.1p priorities and apply a fixed classifier to native Fibre Channel interfaces when the system acts as an FCoE-FC gateway. [See Understanding CoS IEEE 802.1p Priority Remapping on an FCoE-FC Gateway.]
  • Software buffer configurability (QFX3500 and QFX3600 standalone switches)—Provides the ability to fine-tune buffer allocations to better support different mixtures of traffic types (lossy, multidestination, or lossless). You can configure the aggregate (all ports) shared buffer versus dedicated buffer allocation, and you can configure the headroom buffer size for lossless traffic. You can also fine-tune the egress queue buffer sizes. [See Understanding CoS Buffer Configuration.]

Related Documentation

Modified: 2015-04-10