ExtremeSwitching (EXOS)

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Kernel Warnings snoop_cache_unresolved

  • 1.  Kernel Warnings snoop_cache_unresolved

    Posted 09-20-2017 05:00
    Hi Guys

    Having a load of these warnings pop up in the logs on my stack and I don't seem to find anything on the forums about it.



  • 2.  RE: Kernel Warnings snoop_cache_unresolved

    Posted 09-20-2017 05:22
    These messages are generated by the exsnoop kernel module, and it generates this message if 2048 or more packets are queued up to be processed by the snooping module. This message is logged the first time this limit is hit, and thereafter for every 10000 packet that hits this condition.



  • 3.  RE: Kernel Warnings snoop_cache_unresolved

    Posted 09-20-2017 05:29
    Is the snooping module enabled by default as I don't have it defined anywhere in my switch configs.

    Would it be worth disabling the snooping module?


  • 4.  RE: Kernel Warnings snoop_cache_unresolved

    Posted 09-20-2017 05:47
    By default, it is enabled.

    Please share the below outputs:
    a. debug hal show ipv4mc
    b. show mcast cache
    c. show igmp snooping vlan vlan2018

    - Is this a valid destination group address in the network?
    - Who is the source IP, any kind of server which generates multicast packets?



  • 5.  RE: Kernel Warnings snoop_cache_unresolved

    Posted 09-21-2017 08:55
    Hi

    Running recommendation C on one of our VLAN's and found an IP that seems to be claiming a huge amount of groups.

    I will take a look into the IP and post back.

    But it isn't the IP that I see being dropped in my logs. Would this be due to this one host taking up so much of the cache that the other IP's in the group get dropped because the cache limit is hit?

    - Josh


  • 6.  RE: Kernel Warnings snoop_cache_unresolved

    Posted 09-27-2017 11:24
    I take it this has been marked as resolved?


  • 7.  RE: Kernel Warnings snoop_cache_unresolved

    Posted 09-27-2017 11:24
    Hi Josh, yes, it looks like this was marked resolved a few days ago. Has the information in the thread helped?


  • 8.  RE: Kernel Warnings snoop_cache_unresolved

    Posted 09-27-2017 11:24
    It did indeed but I was hoping to get more info from my last reply.