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  1. Senior Member
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    #1

    Default Question On LACP

    When you "force" a channel to negotiate a link with another device, how is it different from it being in the "on" state?
    How do I know whether to do it on device A or device B?

    If I put one in "force" mode while the other is "passive", will it work?
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  3. Network Engineer Dieg0M's Avatar
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    #2
    There is only 3 modes for LACP and they are passive, active and on. "force" is not used to negotiate a link with another device but to force the physical interface to take on the parameters of the port channel and ignore the port profile. As far as I know it is only used for specific Cisco UCS interfaces configuration.
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  4. Junior Member
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    #3
    I think on isn't an LACP mode... on just means it does not use a negotiating protocol..IMO it's used when the other end doesn't support LACP, like a server NIC (notably vSphere, i heard the latest release added LACP support)

    Demystifying LACP vs Static EtherChannel for vSphere
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  5. Network Engineer Dieg0M's Avatar
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    #4
    Quote Originally Posted by realdreams View Post
    I think on isn't an LACP mode... on just means it does not use a negotiating protocol..IMO it's used when the other end doesn't support LACP, like a server NIC (notably vSphere, i heard the latest release added LACP support)

    Demystifying LACP vs Static EtherChannel for vSphere
    Sorry, I didn't express myself clearly. There is only 3 modes that allow LACP to be negotiated and they are passive, active and on.
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  6. Junior Member Registered Member
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    #5
    Quote Originally Posted by Dieg0M View Post
    There is only 3 modes that allow LACP to be negotiated and they are passive, active and on.
    Mode "On" forms a static LAG that does not use LACP. LACP is a protocol that negotiates a LAG, and can be either be set to active (engage the other end) or passive (wait to be engaged).

    And yes, the Distributed vSwitch does allow for LACP in vSphere 5.1 and later.
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  7. Network Engineer Dieg0M's Avatar
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    #6
    I stand corrected. I never used the "on" mode and thought it would negotiate with an LACP active interface. Thanks for the info. Either way, force does not create a LAG but forces an interface to take on the parameters of the port channel.
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