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Link Aggregation dropped packets

NetworkWiseNetworkWise
in Firebox - Networking, Multi-Wan, VLAN, NAT, SD-WAN

I have T40 running version 12.9.3.B679093 and it has two links configured in Link Aggregation Mode = Dynamic 802.3.ad with Type = VLAN

They hand off to an aruba/hp switch that has a trunk setup with two interfaces and LACP. I notice that on one of the links, i constantly see Drops Tx packets. I've tried change the port on the switch and changing out the cable but none of that has worked.

What could be causing this issue and where else can i look to gather info?

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    james.carsonjames.carson Moderator, WatchGuard Representative

    Hi @NetworkWise
    If you're seeing dropped traffic on the TX side, that generally means that the firewall is having a difficult time sending traffic. Once the send buffer reaches the maximum amount of traffic, the firewall will drop traffic.

    -Does moving to an active/backup LAG stop the TX drops?
    -Does unplugging one of the links in the LAG make the TX drops stop?
    -Does the other side of the LAG (the switch) also show errors?

    Also: In general, a T40 won't be able to push much if any over 1Gbps for most traffic. I can't verify this in your environment, but I suspect a dynamic LAG might not offer any benefit in this situation.

    -James Carson
    WatchGuard Customer Support

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