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Learned MAC with flag 0x2001f and deleted MAC with flag 0x1000

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  • 1.  Learned MAC with flag 0x2001f and deleted MAC with flag 0x1000

    Posted 03-17-2021 15:35
    Hi,

    I would like to ask. What would the flag code mean on the following two messages?
    Wed Mar 17 19:22:59 2021 vlan_name vlan_1847+1847 mac bc:91:b5:aa:d9:85 was learned on ae20.0 with flags: 0x2001f
    Wed Mar 17 19:22:59 2021 vlan_name vlan_1847+1847 mac ba:89:c8:df:47:91 was deleted from ae20.0 with flags: 0x1000​

    I found it when investigating in MAC learning behaviour by using "show ethernet-switching mac-learning-log" on EX switch device.



  • 2.  RE: Learned MAC with flag 0x2001f and deleted MAC with flag 0x1000

    Posted 03-18-2021 08:24
    The flags are not related to the L2 frames.  They are internal data structures used by l2ald (Layer-2 Address Learning Daemon) to indicate various pieces of information.

    ------------------------------
    Jordan Head
    Resident Engineer - Sr. Staff
    JNCIEx3 (SP|DC|ENT)
    ------------------------------



  • 3.  RE: Learned MAC with flag 0x2001f and deleted MAC with flag 0x1000

    Posted 03-19-2021 03:28
    Hi Jordan,

    Thank you for the answer. I'm currently investigate the EX device which running high CPU utilization with the highest process is l2ald. I got much changes on log message at "show ethernet-switching mac-learning-log" with part of them are the previous logs that I gave to you.  I may need the information regarding to the flag to identify the root cause. And when I get further investigation, There is a vlan with over 300000 mac addresses registered. Just might think that maybe a broadcast storm effect, but I'm not quite sure yet.

    Can you tell us what the information are they? 



  • 4.  RE: Learned MAC with flag 0x2001f and deleted MAC with flag 0x1000
    Best Answer

    Posted 18 days ago
    It is already answered on the switching community section. Thank you.