Etherchannel not distrobuting incoming traffic?

Discussion in 'Cisco' started by Specialist, Jan 20, 2005.

  1. Specialist

    Specialist Guest

    Hi I am running a Debian Sarge system, kernel 2.4 with bonding module 2.4.1 (September 15, 2003) in round-robin mode.
    I am unable to provide the OS ver / switch model at this time but I can get it if it will help.

    I have successfully bonded 2 100Mbit interfaces which are both being used for outgoing traffic (achieving 20MB/sec to a test
    workstation) but incoming traffic appears to only be recieved by one card at any one time (thus never going past 100Mbit speeds).

    After trying a whole host of things on the system (assuming I had configured something wrong) I looked to google to see if anyone
    had difficulties in load balancing incoming traffic. From the small amount of information I could find, people were beginning to
    suspect it was a configuration problem with the cisco switch but no solutions were posted.

    If anyone has experienced this in the past and know of a solution or know why this occurs I would appreciate your help.
    I am not experienced with cisco switches at all and the configuration was setup by a technican from the network team.

    Thanks in advance
    Specialist, Jan 20, 2005
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  2. First, which Cisco switch do you have connected to the Debian box?

    Second, the traffic distribution the switch does depends on which
    load-balancing method you are using, different methods will often
    produce different results, which method is configured on your switch?

    Lastly, could you possibly post the configuration (from the switch) of
    the Etherchannel interface and the physical interfaces involved, for

    Good Luck
    Robert B. Phillips, II, Jan 20, 2005
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  3. Specialist

    anybody43 Guest

    The Etherchannel 'load balancing' system has some limitations,
    it is not magic. On some platforms you can choose the load balancing
    algorithm used. I can't be bothered to look up the details right now
    but you can choose stuff like

    - Mac source
    - Mac dest
    - Mac both
    - IP source
    - IP dest
    - IP both

    as the method used to select the port for any particular packet.

    This is is contrast to, for example, Multilink PPP which
    in the case of n links each packet is divided up into n
    equal parts and each part is sent down one of the links.
    The Etherchannel behaviour will be clearly documented on CCO.
    anybody43, Jan 21, 2005
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