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  • Perpetual PoE (EX4400-24MP, EX4400-24P, EX4400-48MP, and EX4400-48P)—Starting in Junos OS Release 22.1R1, you can configure perpetual PoE on EX4400 switches that support Power over Ethernet (PoE). Perpetual PoE provides uninterrupted power to connected powered devices even when the power-sourcing equipment switch is rebooting.

    [See Configuring Perpetual PoE and Fast PoE.]

  • Support for 100M optics on 1GbE ports (EX4400-48F)—Starting in Junos OS Release 22.1R1, we support 1-Gbps speed on the first 36 ports of PIC 0.

    Use the following 100M optics on these 1GbE ports of EX4400-48F switches:

    • EX-SFP-1FE-FX
    • EX-SFP-1FE-LX
    • EX-SFP-FE20KT13R15
    • EX-SFP-FE20KT15R13

    [See Port Speed for EX4400-48F.]

  • Support of autonegotiation for 1GbE interfaces (ACX710, ACX5448, ACX5448-D, and ACX5448-M)—Starting in Junos OS Release 22.1R1, we support autonegotiation for 1GbE interfaces. Use the existing auto-negotiation | no-auto-negotiation statement at the [edit interfaces interface-name gigether-options] hierarchy level to enable and disable autonegotiation for 1GbE interfaces.

    [See auto-negotiation.]

  • Support for admin down in PS interfaces (MX Series)—Starting in Junos OS Release 22.1R1, we support the admin down process for PS interfaces. Admin down is a process you use to disable a physical interface or logical interface , marking it as down, without removing the interface configuration from the system. You can use the existing disable statement under the [edit interfaces interface-name] or [edit interfaces interface-name unit logical-unit-number] hierarchy level to disable a PS physical interface or PS logical interface, respectively.

    If you disable a PS physical interface, then the interface will be admin down and logical interfaces will be link down. If you disable a PS logical interface, then the logical interface will be admin down and link up.

    [See disable (Interface).]