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Class of Service

  • Support for explicit congestion notification (ECN) (NFX Series, SRX380, SRX300, SRX320, SRX340, SRX345, and vSRX 3.0)—Starting with Junos OS Release 22.2R1, you can enable ECN marking for packets in scheduler queues on the listed devices. ECN enables end-to-end congestion notification between two endpoints on TCP/IP based networks. The two endpoints are an ECN-enabled sender and an ECN-enabled receiver. You must enable ECN on both endpoints and on all intermediate devices between the endpoints.

    ECN notifies networks about congestion with the goal of reducing packet loss and delay by making the sending device decrease the transmission rate until the congestion clears, without dropping packets.

    To enable ECN, issue the set class-of-service scheduler-name explicit-congestion-notification command.