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  • Support for ASIC temperature-based voltage reduction (PTX10004, PTX10008, PTX10016 with PTX10K-LC1201-36CD and PTX10K-LC1202-36MR line cards, and PTX10001-36MR)—Starting in Junos OS Evolved Release 22.2R1, Junos OS Evolved dynamically manages the voltage of the DC-DC converters to keep ASIC temperature within safe operating limit.

    We’ve enabled voltage reduction by default as it also helps in reducing power consumption. To disable the feature, use the set chassis fpc slot pfe pfe-instance temp-voltage-reduction-disable command.

    [See fpc and show chassis fpc.]

  • Support for Fabric Hardening (PTX10004, PTX10008, and PTX100016 with PTX10K-LC1202-36MR line card)—Starting in Junos OS Evolved Release 22.2R1, the PTX series routers support fabric hardening. Fabric hardening is a resiliency feature to detect fabric blackholing and attempt automatic recovery process to restore the Packet Forwarding Engines from blackhole condition. If recovery fails, interfaces are disabled to limit the blackholing and alarms are raised to indicate the unreachable PFEs.

    We’ve enabled fabric hardening by default.

    [See Fabric Hardening and Recovery and show chassis fabric reachability.]

  • High Availability (HA) Platform Redundancy Support for ACX7509 Devices— High availability platform redundancy support for ACX7509 device includes the following:
    • Support for Graceful RE Switchover (GRES) for simultaneous switchover of RCB and FEB. Support for nonstop active routing (NSR) seamless switchover with Layer-2 or Layer-3 protocol data packets.
    • Support for two RCBs and two FEBs for redundancy. The RCB and FEB mastership is tied. The RCB0-FEB0 and RCB1-FEB1 switchover together. RCB and FEB are a host-subsystem and switchover due to one will cause a complete host sub-system switch.

    • ACX7509 has one CPU per RE, and transmit traffic ( including transit traffic, host-traffic, inline keepalive sessions) is affected when the master RE or FEB is affected. The recovery action is a fast RE switchover with support for replication and restoration of statistics.

    [See Platform Redundancy FEB Redundancy Support for High Availability of ACX7509 Devices,routing-engine (Chassis),request chassis feb,request chassis routing-engine master,show chassis feb,show chassis routing-engine, and show system switchover.]