Help us improve your experience.

Let us know what you think.

Do you have time for a two-minute survey?



  • New ACX7100-32C Universal Metro Router (ACX Series)—In Junos OS Evolved Release 21.1R1-S1, we introduce the ACX7100-32C, a 1-U, fixed configuration high-performance router. The ACX7100-32C provides a system throughput of up to 4.8 Tbps through the following port configurations:

    • Thirty-two QSFP28 ports (ports 0 through 31) that operate at 100-Gbps speed.
    • Four double-density QSFP56-DD ports (ports 32 through 35) that operate at a default speed of 400-Gbps.

    We ship the ACX7100-32C routers with redundant power supply modules (PSMs). You can order router models with either AC or DC PSMs. The router supports only front-to-back airflow.

    To install the ACX7100-32C router hardware and perform initial software configuration, routine maintenance, and troubleshooting, see the ACX7100-32C Universal Metro Router Hardware Guide.

    Table 1 summarizes the ACX7100-32C features supported in Junos OS Evolved Release 21.1R1-S1.

    Table 1: Features Supported by the ACX7100-32C Routers



    Class of service (CoS)

    Support for classification and rewrite rules of all types (Inet-Prec, DSCP, DSCP-v6, IEEE-802.1p, and IEEE-802.1ad) at the logical interface level. [See Classifiers and Rewrite Rules at the Global, Physical, and Logical Interface Levels Overview.]

    Support for port shaping and scheduling with eight virtual output queues (VoQs) per port and two scheduling priority levels (strict-high and low). This release also supports for multiple strict-high priority queues (round-robin scheduling), multiple low-priority queues (weighted fair queuing, or WFQ, scheduling), and default deep buffers. [See Schedulers Overview for ACX Series Routers and Shared and Dedicated Buffer Memory Pools on ACX Series Routers .]

    High availability and resiliency

    Platform resiliency to handle failures and faults related to components such as CPU, fan trays, temperature sensors, power supply units, FPGA, and optics. Fault handling includes detecting and logging the error, raising alarms, sending SNMP traps, providing indication about the error through LEDs, self-healing, and taking components out of service. [See show system errors active.]

    Interfaces and chassis

    Support for a built-in Routing Engine. The Routing Engine supports fault-handling actions such as logging errors, raising alarms, sending SNMP traps, and providing indication about the errors through LEDs. The ACX7100-48L doesn't support a pluggable or redundant Routing Engines. As a result, you cannot use GRES on this router. The ACX7100-48L router does not support these operational commands: request chassis routing-engine master acquire and request chassis routing-engine master release. [See show chassis hardware.]

    Support for environmental monitoring and field-replaceable unit (FRU) management. [See show chassis hardware.]

    Interface support for ACX7100-32C Routers. The ACX7100-32C has 32 built-in QSFP28 ports that can operate at a default speed of 100 Gbps and 4 built-in QSFP56-DD ports that can operate at a default speed of 400 Gbps. You can channelize the QSFP28 ports into:
    • Four 25GbE interfaces
    • Four 10GbE interfaces
    • Two 50GbE interfaces
    You can channelize the QSFP56-DD ports into:
    • Four 100GbE interfaces
    • Eight 50GbE interfaces
    • Eight 25GbE interfaces
    • Two 50GbE interfaces
    See [Port Speed Overview.]

    Layer 2 features

    Support for the following advanced Layer2 features:

    • Unqualified bridging support
    • Bridge domain without a vlan-id number statement
    • Bridge domain with the vlan-id value set to none
    • Bridge domain with a single VLAN ID
    • Single-learning domain
    • MAC limiting
    • Ethernet service types:
      • E-Line with AC interface types port, VLAN, Q-in-Q, VLAN list, and VLAN maps
      • E-Line
      • E-LAN
      • E-Access
      • E-Transit
    • LLDP
    • LACP
    • IRB interface
    • Link aggregation group support with the following hashing algorithms:
      • For family multiservice, destination and source MAC addresses
      • For family inet, Layer 3 and Layer 4
      • For family inet6, Layer 3 destination and source addresses
      • For family inet6, Layer 4 destination and source ports
    • Encapsulation types:
      • extended-vlan-bridge
      • vlan-bridge
    • Q-in-Q tunneling
    [See Understanding Layer 2 Bridge Domains] and Q-in-Q Tunneling on ACX Series.]
    Support for interface-mode access, interface-mode trunk, and vlan members configuration options as follows:

    set interfaces et-0/0/0 unit 0 family ethernet-switching interface-mode trunk

    set interfaces et-0/0/0 unit 0 family ethernet-switching interface-mode access

    set interfaces et-0/0/0 unit 0 family ethernet-switching vlan members 100

    [See Bridging and VLANs.]

    Layer 3 features

    Support for the following Layer 3 features:

    • Longest prefix match
    • Exception packets handling
    • Fragmentation handling
    • ICMP redirect handling
    • VLAN tagging modes
    • Neighbor solicitation
    • Unicast RPF
    • Interface-based routing

    The ACX7100-48L router also supports interior gateway protocols such as OSPF, IS-IS, RIP, and ECMP. [See Configure ICMP Features, Enabling VLAN Tagging, Neighbor solicitation, Understanding Unicast RPF (Routers), OSPF Overview, IS-IS Overview, RIP User Guide, and BGP Overview.]

    Support for Layer 3 features.The ACX7100-48L supports BGP for IPv4 and IPv6. This release also includes support for protocols such as ECMP, OSPF, and ISIS. Currently, the Layer 3 features such as Layer 3 VPN, BGP PIC, BGP LU, and BGP PIC core are not supported. [See BGP Overview.]


    Support for Layer 2 multicast-related features, including support for IGMP and Multicast Listener Discovery (MLD) snooping. You can configure IGMP snooping with IGMPv1, IGMPv2, and IGMPv3, which includes support for the following:

    • IGMP snooping in a bridge domain
    • IGMP snooping with IRB interface configured in a bridge domain
    • MLD snooping in a bridge domain
    • MLD snooping with IRB interface configured in a bridge domain
    [See IGMP Snooping Overview.]

    Routing policy and firewall filters

    Unicast reverse path forwarding (unicast RPF) support for IPv4 and IPv6. You can reduce the impact of denial-of-service (DoS) attacks for IPv4 and IPv6 interfaces by configuring unicast RPF. You can use unicast RPF to determine the source of attacks and reject packets from unexpected source addresses on interfaces. However, we do not support unicast RPF checking for:

    • Transit packets exiting a tunnel source interface
    • Asymmetrical routing

    To configure unicast RPF, enable the rpf-check statement at the [edit interfaces interface-name unit logical-unit-number family inet] hierarchy level. [See Understanding Unicast RPF (Routers).]

    Support for firewall filters and policers. You can configure firewall filters with packet match conditions for the bridge domain, IPv4, and IPv6 families. This release introduces support for the following match conditions in the egress direction for IPv4 and IPV6 traffic:

    For IPv4:

    • ttl
    • tcp-flags

    For IPv6:

    • destination-ip
    • next-header
    • traffic-class
    • hop-limit
    • L4 ports
    • icmp-type/code
    • tcp-flags

    The ACX71000-48L also supports firewall filter actions that include count, discard, log, syslog, and policer. [See Overview of Firewall Filter Match Conditions and Actions on ACX Series Routers.]

    Service applications

    Support for RFC 2544-based benchmarking tests. We support only the Layer 3 reflector function for these tests. The support is further restricted to:

    • family inet only
    • IPv4 source and destination addresses

    You use the RFC 2544 benchmarking tests to measure and demonstrate the service-level agreement (SLA) parameters before activating the service. The tests measure throughput, latency, frame loss rate, and back-to-back frames.

    You can configure these tests at the [edit services monitoring rfc2544] hierarchy level. [See RFC 2544-Based Benchmarking Tests Overview.]

    Software installation and upgrade

    Support for either WAN interfaces or management interfaces to automatically download and install the appropriate software and the configuration file on your device during the ZTP bootstrap process. [See Zero Touch Provisioning.]

    Support for secure-boot implementation based on the UEFI 2.4 standard. [See Software Installation and Upgrade Guide.]

    Timing and synchronization

    Support for frequency synchronization using the Synchronous Ethernet. The ACX7100-32C router supports frequency synchronization using Synchronous Ethernet in accordance with the ITU-T standard G.8262 and G.8262.1. [See Synchronous Ethernet Overview.]

    Support for Synchronous Ethernet with Precision Time Protocol (PTP)-Transparent Clock (TC). To enable PTP-TC on your router, use the new syntonized-e2e-transparent configuration statement at the [edit protocols ptp] hierarchy level. With a PTP-TC, you can minimize the packet delay variation between a primary clock and a client clock to optimize the accuracy for various port speeds. See [Configuring a PTP Transparent Clock.]