Switching

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  • 1.  Link aggregation hashing -> will it take the local port?

    Posted 08-24-2010 09:21

    Hi,

     

    Another one we have been discussing between colleagues a while ago:

     

    Imagine:  VC with two members

    Two devices (server or switch) connected with a LAG to both members.

    Device A has sent a packet on its first link of the LAG, with destination device B

     

     

     

    Then my question:

    * will the member that received the packet send it always out via his direct link to device B

       (take local LAG port)

    or

    * there is a possibility that the packet will be sent out to the other member (on VCP or fiber) and then to device B

      (because the hashing algorithm could decide that the packet should be on the certain port of the LAG, which could be on another member)

     

     

     

    And even more difficult: how can we verify this?

     

    KR,

     

     Thomas

     



  • 2.  RE: Link aggregation hashing -> will it take the local port?
    Best Answer

    Posted 08-24-2010 09:31

    On the EX4200 VC, the egress port is determined by the ingress hash, so the data could exit either a local port or a port on another VC member.



  • 3.  RE: Link aggregation hashing -> will it take the local port?

    Posted 08-24-2010 09:34

    Thanks, this information is valuable when making a the network design.