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High Availability

  • Support for running unified ISSU on MPC10E line cards (MPC10E line cards on MX240, MX480, and MX960 routers)—Starting in Junos OS Release 23.1R1, you can run in-service software upgrade (ISSU) on MPC10E line cards. In previous releases in which ISSU was available, upgrades on line cards required a rapid restart of the new software. Those previous upgrades left the forwarding path untouched because the line cards don't have hardware redundancy. Now you can run ISSU on the line cards by issuing the command request system software in-service-upgrade. This new feature reduces packet loss by reducing the line card's downtime during ISSU.

    We recommend that you run ISSU only on stable working systems.

    Before you issue the ISSU command, ensure that you've enabled GRES and nonstop active routing (NSR).

    See caveats and limitations in Unified ISSU System Requirements .

    [See request system software in-service-upgrade.]

  • Support for routing protocols when running unified ISSU on MPC10E line cards (MPC10E line cards on MX240, MX480, and MX960 routers)—Starting in Junos OS Release 23.1R1, we support routing protocols when you run ISSU on MPC10E line cards by issuing the command request system software in-service-upgrade.

    We support these routing protocols:

    • BGP add-path with multipath
    • BGP BMP
    • BGP flowspec
    • BGP multipath
    • BGP Prefix-Independent Convergence (PIC) Edge
    • BGP with resource public key infrastructure (RPKI)
    • CCC
    • L2 circuit
    • L2VPN

    • L3VPN

    • L3VPN-CSC

    • MPLS LDP
    • MPLS-over-GRE tunnels
    • MPLS-over-UDP tunnels
    • MPLS RSVP
    • OSPF
    • PIM-ASM
    • PIM-SSM
    • VPN

    [See request system software in-service-upgrade.]

  • Support for Layer 2 forwarding when running unified ISSU on AFT-based line cards (MPC-10E line cards on MX240, MX480, and MX960 routers)—Starting in Junos OS Release 23.1R1, we support Layer 2 forwarding when you run ISSU on Advanced Forwarding Toolkit (AFT)-based line cards.

    We support the following Layer 2 forwarding features:

    • EVPN-VXLAN
    • LACP
    • LAGs
    • LLDP
    • Q-in-Q interfaces
    • VLAN

    [See request system software in-service-upgrade .]