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Layer 3 Etherchannel Issue

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  • Layer 3 Etherchannel Issue

    Dear Group,

    I have bought a pair of Catalyst 3750G switches with the advanced IP
    services image installed. I am trying to achieve Etherchannel load
    balancing using Layer 3 by assigning the port channel an IP address.

    I want to be able to send traffic to the IP address assigned to the port
    channel and it load balance using src-dst-ip to three backend servers
    running a server application which accepts connections on TCP port
    1023. All of these servers have Intel ProSet adapters configured for
    LACP teaming.

    If I assign the port channel an IP address of and each
    of the servers teamed NICS a 192.168.29.X address I cannot get any
    traffic to the server hosts sending data to the of the
    port-channel address. However if i send traffic to TCP port 1023 to
    one of the servers teamed NIC 192.168.29.X addresses traffic gets

    Each of the servers ports on the switch are assigned into the correct
    channel port group.

    I guess my first question is if what I am trying to acheive possible
    using an L3 Etherchannel. And if so what I am doing wrong.

    I will post a copy of relevant config sections shortly. The two
    catalyst switches are in a stack. Each servers dual NIC has a port
    assigned on each member of the stack to create the Etherchannel.

    IE GigabitEthernet1/0/1 , GigabitEthernet2/0/1 - 1st server
    GigabitEthernet1/0/2, GigabitEthernet2/0/2 - 2nd server and so on

    Kind Regards

    would GLBP be an option and if so is it supported on Cat 3750G Adv IP Services?

  • #2
    Re: Layer 3 Etherchannel Issue

    Hi rossl,

    It sounds like what you are trying to do needs to be done by configuring HSRP. Be low is the link describing what HSRP:

    Etherchannel load balancing is more of pulling to together multiple switchports together to create the Illusion of more bandwidth by aggregating the port speeds of the ports that are bonded together.

    If I am missing something please let me know or maybe other members that have been following this thread can chime in so that we can all get rossl on the right track.