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Routing Options

  • Enhanced PPPoE session creation on backup router (MX Series devices and vMX)—In Junos OS releases before Release 21.3R1, the PPPoE session switch over from a primary router to a backup router happens after the Point-to-Point Protocol (PPP) keepalive time expires. Starting in Junos OS Release 21.3R1, the PPPoE session can switch over without waiting for the keepalive time to expire. When the backup router receives an unrecognized packet from a PPP session, it responds with PPPoE Active Discovery Termination (PADT) message. This PADT response causes the PPP client to restart immediately, which reduces the time to restart PPP sessions.

    This enhancement allows the subscribers to quickly reestablish the session on the standby router.

    [See Understanding Point-to-Point Protocol over Ethernet.]