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  • 1.  High CPU value in FPC

    Posted 05-25-2022 16:49

    I rebooted the box and when the box returned I identified that the FPC CPU was high all the time. Some customers are complaining that they are losing packets and having high latency in services using VPLS. I noticed that the ISR is set to a high value. Is there any way to verify the reason for such a high value in the ISR?
    Model: mx10003
    Junos: 19.4R3.11

    root@JUNOS.ALOO.SPO> start shell pfe network fpc0

    SMPC platform (1750Mhz Intel(R) Atom(TM) CPU processor, 3168MB memory, 8192KB flash)

    SMPC0(JUNOS.ALOO.SPO vty)# show sched
    Total system uptime 12+18:24:13, (1102978445 ms), 819538377 thread dispatches
    CPU load is 100% (1 second), 82% (5 second)
    86% (10 second), 88% (1 minute)
    Total interrupt time 527200839 (ms)

    CPU Name Time(ms)
    16% Idle 182005084
    35% Threads 393847787
    47% ISR 527200839
    47% Level 1 525025744
    0% Level 6 2175095

    Last Long Running Thread Event time 100 ms

    CPU Name Time(ms) Count
    13% Level 1 13 43

    Top Thread:
    pid = 47
    name = TNPC CM
    time = 76396895 ms
    cpu = 6%

    root@JUNOS.ALOO.SPO# run show chassis fpc
    Temp CPU Utilization (%) CPU Utilization (%) Memory Utilization (%)
    Slot    State      (C)    Total    Interrupt    1min    5min    15min    DRAM (MB)    Heap    Buffer
    0         Online    58        79             46             85          85           85               3168               29            25
    1         Online    59        65             33             66          66           68               3168               29            24



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    DIEGO TEIXEIRA
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  • 2.  RE: High CPU value in FPC

    Posted 05-26-2022 08:44
    I'm not sure what ISR is or how to show more details, but are there any log messages that might help?

    show log messages | match fpc


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    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP - Retired)
    http://puluka.com/home
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  • 3.  RE: High CPU value in FPC

    Posted 05-26-2022 09:48
    I saw some DDoS LOGS but I think these logs would be affecting the threads processing, right?

    May 26 06:28:45 JUNOS.ALOO.SPO jddosd[8794]: DDOS_PROTOCOL_VIOLATION_SET: Warning: Host-bound traffic for protocol/exception TTL:aggregate exceeded its allowed bandwidth at fpc 1 for 130 times, started at 2022-05-26 06:28:45 BRT
    May 26 06:33:56 JUNOS.ALOO.SPO jddosd[8794]: DDOS_PROTOCOL_VIOLATION_CLEAR: INFO: Host-bound traffic for protocol/exception TTL:aggregate has returned to normal. Its allowed bandwith was exceeded at fpc 1 for 130 times, from 2022-05-26 06:28:45 BRT to 2022-05-26 06:28:55 BRT
    May 26 08:47:03 JUNOS.ALOO.SPO jddosd[8794]: DDOS_PROTOCOL_VIOLATION_SET: Warning: Host-bound traffic for protocol/exception TTL:aggregate exceeded its allowed bandwidth at fpc 1 for 131 times, started at 2022-05-26 08:47:02 BRT
    May 26 08:52:06 JUNOS.ALOO.SPO jddosd[8794]: DDOS_PROTOCOL_VIOLATION_CLEAR: INFO: Host-bound traffic for protocol/exception TTL:aggregate has returned to normal. Its allowed bandwith was exceeded at fpc 1 for 131 times, from 2022-05-26 08:47:02 BRT to 2022-05-26 08:47:05 BRT
    May 26 09:18:03 JUNOS.ALOO.SPO jddosd[8794]: DDOS_PROTOCOL_VIOLATION_SET: Warning: Host-bound traffic for protocol/exception TTL:aggregate exceeded its allowed bandwidth at fpc 1 for 132 times, started at 2022-05-26 09:18:03 BRT
    May 26 09:26:28 JUNOS.ALOO.SPO jddosd[8794]: DDOS_PROTOCOL_VIOLATION_CLEAR: INFO: Host-bound traffic for protocol/exception TTL:aggregate has returned to normal. Its allowed bandwith was exceeded at fpc 1 for 132 times, from 2022-05-26 09:18:03 BRT to 2022-05-26 09:21:28 BRT

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    DIEGO TEIXEIRA
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  • 4.  RE: High CPU value in FPC

    Posted 06-23-2022 08:36
    Has anyone else had this behavior in the box?

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    DIEGO TEIXEIRA
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