Incident open #12

RT-PTX10K-FKT3 down

CPU load on RT-PTX10K-FKT3 started to increase on 17.09.2026 at around 12AM.

We tried to debug the cpu load for nearly three hours. While debugging, the router crashed.

Since RT-PTX10K-FKT3 is an edge router, almost no customers are directly affected.
Occurred: 2026-07-13 04:43 (Europe/Berlin)
CPU load on RT-PTX10K-FKT3 started to increase on 17.09.2026 at around 12AM.

We tried to debug the cpu load for nearly three hours. While debugging, the router crashed.

Since RT-PTX10K-FKT3 is an edge router, almost no customers are directly affected.

Updates

  • 2026-09-17 03:13:58 UTC
    We found the issue:

    The new mitigation software forwarded some IPv6 packets to an IPv4 nexthop.

    This caused a lot of IGMPv6 Snooping packets to be forwarded to the PFE cpu. This caused high cpu load.

    We have applied a hotfix.

    We do not observe this issue anymore.