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ARP entries missing interface information

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  • 1.  ARP entries missing interface information

    Posted Dec 14, 2021 06:18 AM
    Hi 

    We have a pair of 8400 switches in a cluster. We have noticed that traffic to some of our servers is very slow.
    Further investigation has found that some of our arp entries do not have interface information on one core but do on the other.
    VSX looks OK and the setting haven't changed.

    The interface involved is an MC-LAG but the lacp information is also OK

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    Michael Doherty
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  • 2.  RE: ARP entries missing interface information

    Posted Dec 15, 2021 07:08 AM

    What firmware version are your 8400 Switches running ? There were similar issues on the 10.02, 10.03 versions.

    Also are you using the "active gateway" feature ?



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    ibrahim massad
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  • 3.  RE: ARP entries missing interface information

    Posted Dec 15, 2021 11:53 AM
    Hey Michael,

    Please check on the ISL configuration are passing all VLANs, you should have this configuration

    switchport trunk allowed vlan all

    This allows the syncronization for arp table for all VLANs.

    Regards

    - Roberto Rocha

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    Roberto Rocha Valencia
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