# [OmniOS-discuss] ixgbe: breaking aggr on 10GbE X540-T2

Stephan Budach stephan.budach at JVM.DE
Mon May 9 18:04:00 UTC 2016

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    Am 09.05.16 um 16:33 schrieb Dale Ghent:
    >> On May 9, 2016, at 8:24 AM, Stephan Budach <stephan.budach at JVM.DE> wrote:
    >>
    >> Hi,
    >>
    >> I have a strange behaviour where OmniOS omnios-r151018-ae3141d will break the LACP aggr-link on different boxes, when Intel X540-T2s are involved. It first starts with a couple if link downs/ups on one port and finally the link on that  port negiotates to 1GbE instead of 10GbE, which then breaks the LACP channel on my Cisco Nexus for this connection.
    >>
    >> I have tried swapping and interchangeing cables and thus switchports, but to no avail.
    >>
    >> Anyone else noticed this and even better… knows a solution to this?
    > Was this an issue noticed only with r151018 and not with previous versions, or have you only tried this with 018?
    >
    > By your description, I presume that the two ixgbe physical links will stay at 10Gb and not bounce down to 1Gb if not LACP'd together?
    >
    > /dale
    I have noticed that on prior versions of OmniOS as well, but we only
    recently started deploying 10GbE LACP bonds, when we introduced our
    Nexus gear to our network. I will have to check if both links stay at
    10GbE, when not being configured as a LACP bond. Let me check that
    tomorrow and report back. As we're heading for a streched DC, we are
    mainly configuring 2-way LACP bonds over our Nexus gear, so we don't
    actually have any single 10GbE connection, as they will all have to be
    conencted to both DCs. This is achieved by using VPCs on our Nexus switches.

    Thanks,
    Stephan

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