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  • Support for Q-DD-400G-LR4-10 and Q-DD-4X100G-LR optics on MPC11E line card (MX2010 and MX2020)—Starting in Junos OS Release 21.1R1, you can use the Q-DD-400G-LR4-10 and Q-DD-4X100G-LR 400GE optics on the MPC11E line card in the MX2010 and MX2020 routers.

    [See Hardware Compatibility Tool.]

  • Dual-speed support on 100Gbps DAC breakout cable (QFX5120-48Y, QFX5200-32C, and QFX5210-64C)—Starting in Junos OS Release 21.1R1, we support 4x10Gbps speed along with 4x25Gbps speed on the QSFP28 100Gbps DAC breakout cable with the other end SFP28 transceivers. Supported cable lengths are 1, 2, 3, and 5 meters. You can set the 4x10Gbps speed by using the set chassis fpc fpc pic pic port port number channel-speed 10g command.

    [See Hardware Compatibility Tool.]

  • Native VLAN ID configuration on the reth interface (SRX300, SRX320, SRX340, SRX345, SRX380, SRX550HM, SRX1500, SRX4100, SRX4200, and SRX4600) —Configuring the native VLAN ID on the redundant Ethernet (reth) interface enables the logical interface whose VLAN ID matches the native VLAN ID that is configured for that interface to accept untagged packets as well as tagged packets. Using the same logical interface with the native VLAN ID enabled ensures that any packet going out of that interface does not have a tag attached. Packets can be outbound control packets or transit data packets.

    [See native-vlan-id.]

  • Support for MC-LAG (ACX710) —Support for multichassis link aggregation in Layer 2 unicast and multicast and Layer 3 multicast configurations.

    Multichassis LInk Aggregation User Guide for EX Series, MX Series, and QFX Series Devices

  • Support for DDOS telemetry (MX Series)–Starting in Junos OS Release 21.1R1, you can get the DDOS telemetry statistics with the help of Jvision from MPC1, MPC2, MPC3, MPC5, MPC6, MPC7, MPC8, and MPC9 line cards. Use configuration statements:

    • [show services analytics sensor ddos] - to see the DDOS configuration
    • [show agent sensors] - to see the details about configured sensors

    [See sensor (Junos Telemetry Interface), Guidelines for gRPC and gNMI Sensors (Junos Telemetry Interface), show agent sensors, and show configuration services analytics sensor ddos.]