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  • New ACX7509 router (ACX Series)—In Junos OS Evolved Release 21.4R1, we introduce the ACX7509 Router, a high-performance multiservice router designed to address the needs of emerging 5G, IoT, and low latency virtualized edge services. The ACX7509 routers enable a wide variety of cloud-ready port speeds, making it ideal for metro high-end aggregation, large enterprise, and data center applications.

    The ACX7509 provides several capabilities that include advanced timing and synchronization, Control and User Plane Separation (CUPS), network slicing, and a comprehensive set of features that are suited for cloud metro architectures.

    With a 5-U modular and energy efficient design, the ACX7509 has a 4.8-Tbps forwarding-capacity ASIC, with over-subscription support and Flexible PIC Concentrators (FPCs) with 1GbE, 10GbE, 25GbE, 40GbE, 50GbE, 100GbE, 200GbE, and 400GbE port configurations.

    We ship the ACX7509 routers with redundant power supply modules (PSMs). You can order the ACX7509-PREMIUM configuration routers with AC or DC power supply modules (PSMs).

    Table 1 summarizes the descriptions of the features either supported on or added to the ACX7509 platform in Junos OS Evolved Release 21.4R1.

    Table 1: Features supported on or added to the ACX7509




    • Support for new line cards (ACX7509):

      We introduce the new ACX7509-FPC-4CD, ACX7509-FPC-16C, and ACX7509-FPC-20Y line cards. The line cards come in 1GbE, 10GbE, 25GbE, 40GbE, 50GbE, 100GbE, 200GbE, and 400GbE port configurations and have Precision Time Protocol (PTP), SyncE (Class C), and Media Access Control Security (MACsec) support.

      • The ACX7509-FPC-16C line card has 16 QSFP/QSFP28 ports that support 40-Gbps and 100-Gbps speeds. Default port speed is 100-Gbps. The line card has a throughput of 1.6 Tbps when installed in FPC slots 1 and 5; 800 Gbps of throughput when installed in other FPC slots. The line card supports all 16 ports when it is plugged into FPC slot 1 and 5. But when it is plugged to other FPC slots, only ports 0,1 4,5,8,9 and 12, 13 are active.

        • You can channelize the ports operating at:

          • 100-Gbps speed to 4x25-Gbps speed

          • 40-Gbps speed to 4x10-Gbps speed

    You can configure four 25-Gbps speed and four 10-Gbps speed breakout cables at 0,1,4,5, 8,9 and 12,13 ports.

    • The ACX7509-FPC-4CD line card has 4 QSFP56/QSFP56-DD ports that support 100-Gbps, 200-Gbps, and 400-Gbps speeds. Default port speed is 400 Gbps. The line card has a throughput of up to 1.6 Tbps when installed in FPC slots 1 and 5 and is supported only in these FPC slots. You can channelize the ports operating at 400-Gbps speed to 4x100-Gbps speed. You can configure four 100-Gbps speed and two 100-Gbps speed breakout cables at 0,1,2,3 ports.

    • The ACX7509-FPC-20Y line card has 20 SFP/SFP+/SFP28/SFP56 ports that support 1-Gbps, 10-Gbps, 25-Gbps, and 50-Gbps speeds. Default port speed is 25 Gbps. 1-Gbps is supported in all slots except FPC slots 1 and 5. 50-Gbps is supported only in FPC slots 1 and 5. The line card has a throughput of up to 1 Tbps when installed in FPC slots 1 and 5; 500 Gbps of throughput when installed in other slots. Channelization is not supported on this line card.

    [See Configuring Port Speed at Port Level.]

    • New ACX7509-FEB Forwarding Engine Board (FEB)—In Junos OS Evolved 21.4R1, we introduce the ACX7509-FEB, which consists of two forwarding ASIC's for packet processing and traffic management. Each forwarding ASIC is capable of supporting 2.4 Tbps with entire FEB support 4.8 T bps throughput, with oversubscription upto 6 Tbps. You can install one or two FEBs on the ACX7509 router. The ACX7509-FEB supports 1+1 redundancy.

    • Support for SFP56, QSFP28, and QSFP56-DD ports on the 50-Gbps (20 ports), 100-Gbps (16 ports), and 400-Gbps (4 ports) FPCs respectively.

    • New ACX7509-RCB Routing and Control Board (RCB)— We introduce the ACX7509-RCB, which consists of Intel Xeon D-1600 processor, 64-GB DDR4 RAM, and two 100-GB SATA SSDs. The ACX7509 router supports two ACX7509-RCBs. ACX7509-RCB is an integrated board and a single field-replaceable unit (FRU) that provides Routing Engine and Control Board (CB) functionality. The Routing Engine performs all route-processing functions, whereas the CB performs chassis control and management plane functionality. The RCB provides control plane functions. You can install one or two RCBs on the ACX7509 router.

    • Platform software support:

      Platform software support includes chassis management and power management for FPC and FEB. We support the following power management functions:

      • Secure boot support for chassis.

      • FPC will be online based on available power, power ratings, and priority sequence configured by user.

      • You can restart or make an FEB online or offline using the request chassis feb slot command.

      • You can configure the power-on sequence for FPC using the set chassis fru-poweron-sequence command. The default priority sequence for FPCs is 0-7 where 0 is the highest priority.

      [See request chassis feb slot, set chassis fru-poweron-sequence, and show chassis feb.]

    • Support for secure boot and secure BIOS in Intel Xeon D-1600 series processors being used on the RCB.

    • Support for RCB infrastructure, peripherals, reachability, resiliency, and CLI commands. [See show chassis routing-engine.]

    • Fault detection, logging, recovery, and debugging support for platform (FEB, FPCs, PSUs, Fan Tray Controllers (FTCs)) resiliency. [See show system alarms.]

    Class of Service

    Class of Service

    Dynamic Host Configuration Protocol

    • DHCP server, client, and relay agent for DHCPv4 and DHCPv6. [See See DHCP Overview.]

    Ethernet Switching and Bridging

    • Support for Ethernet ring protection switching (ERPS) G.8032v2. [See Ethernet Switching User Guide.]

    • Support for STP, Multiple Spanning Tree Protocol (MSTP), Rapid Spanning Tree Protocol (RSTP), VLAN Spanning Tree Protocol (VSTP), Storm Control, and No Local Switching (NLS). [See Spanning-Tree Protocols User Guide.]

    IP Tunneling

    Layer 2 VPN


    • Multiprotocol Label Switching (MPLS) support

      • LDP Downstream-on-Demand

      • LDP over RSVP-TE areas

      • CSPF/single-area CSPF for RSVP-TE

      • RSVP-TE LSP over inter IGP areas

      • SRLG for RSVP LSPs

      • MPLS label stacking

      • LSP protection

      • Inter-AS RSVP-TE LSP

    [See MPLS Overview]


    • Ingress and egress multicast replication— Support for ingress and egress multicast replication using the Recycle replication model where the multicast and broadcast packets destined for their local ports are replicated. There are two passes for each multicast packet. In the first pass, each packet is replicated to each egress PFE in the system using recycle port of the egress PFE. In the second pass, packets are replicated to the ports of the egress PFE.

      Use the set ingress-only statement at the system packet-forwarding-options mcast-repl-type hierarchy level for the ingress replication model and the set ingress-egress-recycle statement at the system packet-forwarding-options mcast-repl-type hierarchy level for ingress and egress multicast replication using the Recycle replication model. If you don’t select the replication type, ingress replication (ingress-only) is considered as the default replication type.

      [See Ingress and Egress Multicast Replication using Recycle Replication Model, ingress-egress-recycle, and ingress-only.]

    • CoS support for ingress-egress-multicast replication—By default, the recycle interface bandwidth is based on chassis oversubscription and platform-specific FPC or interface configuration. Starting in Junos OS Evolved Release 21.4R1, you can configure the bandwidth of the recycle interface to enable:

      • Equal distribution of the recycle interface bandwidth at the PFE level.

      • A percentage of the recycle interface bandwidth for ingress-egress-multicast replication.

      To configure the recycle interface bandwidth, use the following CLI commands:

      • set system packet-forwarding-options internal-forwarding-bandwidth <value in Gbps>
      • set system packet-forwarding-options internal-forwarding-bandwidth <value> reserve ingress-egress-mcast <percentage>

      [See Multicast Ingress-Egress Replication.]

    • IGMP snooping and Multicast Listener Discovery (MLD) snooping support for L2 multicast. [See Configuring IGMP and MLD.]

    • Support for IPv4 and IPv6 L3 multicast protocols: PIM, IGMP (v1, v2, v3), and MLD (v1, v2). [See Multicast Overview.]

    Network Management and Monitoring

    • Support for the following RFC4293 tables:

      • icmpStatsTable—Generic system-wide ICMP counters
      • icmpMsgStatsTable—System-wide per-version and per-message type ICMP counters

    [See Standard MIBs for Junos OS Evolved.]

    Operations, Administration, and Maintenance

    Protection Against DDOS Attacks

    Support for control plane distributed denial-of-service (DDoS) protection. [See Control Plane Distributed Denial-of-Service (DDoS) Protection Overview.]

    Routing Protocols

    • Support for the following Layer 3 features:

      • IP forwarding and exception packet handling

      • IEEE 802.1Q support (VLAN trunking) on IRB interfaces

      • ARP, ND, uRPF, and ECMP

      • IGP protocols: OSPF, RIP, and IS-IS

    • Support for BGP multipath, BGP-LU, and BMP. [See Understanding BGP.]

    • VRRP support for IPv4 and IPv6. [See VRRP and VRRP for IPv6 Overview.]

    Routing Policy and Firewall Filters

    Software Installation and Upgrade

    Source Packet Routing in Networking (SPRING) or segment routing

    Segment routing support:


    • L2 VPN support with VPLS over MPLS. [See Introduction to VPLS.]

    • Support for the following Layer 3 VPN features:

      • Per prefix labels and per VRF table labels for MPLS VPN

      • VRF load balancing using ECMP

      • Layer 3 VPN LSP protection using FRR

      • Export and import of routes between local VRFs (VRF to VRF) and global VRF

      • PE-CE route exchange using Static, eBGP, IS-IS, OSPF, and RIP protocols

      • IPv6 over MPLS (6PE and 6VPE)

      • Service provider chaining using Inter AS options A, B, and C

      [See Understanding Virtual Routing and Forwarding Tables.]

  • The PTX10016 is supported on Junos OS Evolved Release 21.4R1. See Feature Explorer for the full list of supported features.

    Support for New PTX10016 Router Configurations—In Junos OS Evolved Release 21.4R1, we introduce the following new configurations of the PTX10016 router that support JNP10016-SF3 switch interface board (SIB):

    • PTX10016-BASE3
    • PTX10016-PREM2
    • PTX10016-PREM3

    The new SIB provides higher routing capacity and support for the PTX10K-LC1201-36CD and PTX10K-LC1202-36MR line cards.

    We also introduce a new front door (JNP10016-FRNT-PNL) that supports side EMI deflectors and a new rack mount kit (JNP10004-RMK-4POST).

    To install the PTX10016 router hardware and perform initial software configuration, routine maintenance, and troubleshooting, see PTX10016 Packet Transport Router Hardware Guide. See Feature Explorer for the complete list of features for any platform. See PTX10016 Switch Fabric for more information about the SIBs. See PTX10016 Components and Configurations for more information about the router configurations.

    Table 2: Features Supported on PTX10016 Devices
    Feature Description
    Class of Service (CoS) Support for CoS features includes classifiers (behavior aggregate (BA), fixed, and multifield (MF)) rewrite rules, forwarding classes, loss priorities, transmission scheduling, rate control, and drop-profiles. [See CoS Features and Limitations on PTX Series Routers.]
    Interfaces and Chassis
    • Support for redundant power supply includes environment monitoring. Use the request chassis fpc command to override the default power budget for an FPC line card. The SFBs have a higher priority over the line cards for power allocation.

      [See Managing Power and fpc command (PTX Series).]


    You need a license to use the software features on the PTX10016 devices. [To find out the features supported on this device, see PTX10016 Routers Support for the Juniper Flex Program . To add, delete, and manage licenses, see Managing Licenses.]

    Services and Applications

    Support for the following functionalities:

  • Express4 ASIC temperature-based performance throttling (PTX Series)—PTX devices have five Express4 ASICs, each capable of operating at 3.2Tbps for a total of 14.4Tbps per line card with various temperature sensors for software monitoring and alarm issuance. If the Express4 ASICs get too hot, the line card shuts down. Reducing the Express4 ASIC performance reduces power consumption and reduces the ASIC shutdown temperature. To avoid a shutdown on the line card, performance throttling is enabled by default. Use the command set chassis fpc slot pfe pfe-id temp-perf-throttle disable to disable performance throttling. show chassis fpc slot pfe-instance detail displays the real-time status of all the available PFEs and whether the temperature throttle is on. [See fpc, show chassis fpc, and show system errors active.]